期刊文献+
共找到243篇文章
< 1 2 13 >
每页显示 20 50 100
ANovel Non-Isolated Cubic DC-DC Converter with High Voltage Gain for Renewable Energy Power Generation System
1
作者 Qin Yao Yida Zeng Qingui Jia 《Energy Engineering》 EI 2024年第1期221-241,共21页
In recent years,switched inductor(SL)technology,switched capacitor(SC)technology,and switched inductor-capacitor(SL-SC)technology have been widely applied to optimize and improve DC-DC boost converters,which can effec... In recent years,switched inductor(SL)technology,switched capacitor(SC)technology,and switched inductor-capacitor(SL-SC)technology have been widely applied to optimize and improve DC-DC boost converters,which can effectively enhance voltage gain and reduce device stress.To address the issue of low output voltage in current renewable energy power generation systems,this study proposes a novel non-isolated cubic high-gain DC-DC converter based on the traditional quadratic DC-DC boost converter by incorporating a SC and a SL-SC unit.Firstly,the proposed converter’s details are elaborated,including its topology structure,operating mode,voltage gain,device stress,and power loss.Subsequently,a comparative analysis is conducted on the voltage gain and device stress between the proposed converter and other high-gain converters.Then,a closed-loop simulation system is constructed to obtain simulation waveforms of various devices and explore the dynamic performance.Finally,an experimental prototype is built,experimental waveforms are obtained,and the experimental dynamic performance and conversion efficiency are analyzed.The theoretical analysis’s correctness is verified through simulation and experimental results.The proposed converter has advantages such as high voltage gain,low device stress,high conversion efficiency,simple control,and wide input voltage range,achieving a good balance between voltage gain,device stress,and power loss.The proposed converter is well-suited for renewable energy systems and holds theoretical significance and practical value in renewable energy applications.It provides an effective solution to the issue of low output voltage in renewable energy power generation systems. 展开更多
关键词 Cubic DC-DC converter high voltage gain low device stress high efficiency renewable energy
下载PDF
An effective'salt in dimethyl sulfoxide/water'electrolyte enables high-voltage supercapacitor operated at-50℃ 被引量:1
2
作者 Yingbin Liu Chang Yu +5 位作者 Xuedan Song Siyi Hou Shuqin Lan Jinhe Yu Yuanyang Xie Jieshan Qiu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第6期361-367,I0009,共8页
Compared with organic electrolytes,aqueous electrolytes exhibit significantly higher ionic conductivity and possess inherent safety features,showcasing unique advantages in supercapacitors.However,challenges remain fo... Compared with organic electrolytes,aqueous electrolytes exhibit significantly higher ionic conductivity and possess inherent safety features,showcasing unique advantages in supercapacitors.However,challenges remain for low-salt aqueous electrolytes operating at high voltage and low temperature.Herein,we report a low-salt(0.87 m,m means mol kg^(-1))'salt in dimethyl sulfoxide/water'hybrid electrolyte with non-flammability via hybridizing aqueous electrolyte with an organic co-solvent of dimethyl sulfoxide(hydrogen bond acceptor).As a result,the 0.87 m hybrid electrolyte exhibits enhanced electrochemical stability,a freezing temperature below-50℃,and an outstanding ionic conductivity of 0.52mS cm~(-1)at-50℃.Dimethyl sulfoxide can anchor water molecules through intermolecular hydrogen bond interaction,effectively reinforcing the stability of water in the hybrid electrolyte.Furthermore,the interaction between dimethyl sulfoxide and water molecules diminishes the involvement of water in the generation of ordered ice crystals,finally facilitating the low-temperature performance of the hybrid electrolyte.When paired with the 0.87 m'salt in dimethyl sulfoxide/water'hybrid electrolyte,the symmetric supercapacitor presents a 2.0 V high operating voltage at 25℃,and can operate stably at-50℃.Importantly,the suppressed electrochemical reaction of water at-50℃further leads to the symmetric supercapacitor operated at a higher voltage of 2.6 V.This modification strategy opens an effective avenue to develop low-salt electrolytes for high-voltage and low-temperature aqueous supercapacitors. 展开更多
关键词 Dimethyl sulfoxide CO-SOLVENT high voltage Low temperature SUPERCAPACITORS
下载PDF
Challenges in Li-ion battery high-voltage technology and recent advances in high-voltage electrolytes 被引量:1
3
作者 Jianguo Liu Baohui Li +2 位作者 Jinghang Cao Xiao Xing Gan Cui 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第4期73-98,共26页
The electrolyte directly contacts the essential parts of a lithium-ion battery,and as a result,the electrochemical properties of the electrolyte have a significant impact on the voltage platform,charge discharge capac... The electrolyte directly contacts the essential parts of a lithium-ion battery,and as a result,the electrochemical properties of the electrolyte have a significant impact on the voltage platform,charge discharge capacity,energy density,service life,and rate discharge performance.By raising the voltage at the charge/discharge plateau,the energy density of the battery is increased.However,this causes transition metal dissolution,irreversible phase changes of the cathode active material,and parasitic electrolyte oxidation reactions.This article presents an overview of these concerns to provide a clear explanation of the issues involved in the development of electrolytes for high-voltage lithium-ion batteries.Additionally,solidstate electrolytes enable various applications and will likely have an impact on the development of batteries with high energy densities.It is necessary to improve the high-voltage performance of electrolytes by creating solvents with high thermal stabilities and high voltage resistance and additives with superior film forming performance,multifunctional capabilities,and stable lithium salts.To offer suggestions for the future development of high-energy lithium-ion batteries,we conclude by offering our own opinions and insights on the current development of lithium-ion batteries. 展开更多
关键词 Lithium-ion battery high voltage Electrolyte additive Solid electrolyte
下载PDF
Three‐dimensional(3D)‐printed MXene high‐voltage aqueous micro‐supercapacitors with ultrahigh areal energy density and low‐temperature tolerance
4
作者 Yuanyuan Zhu Qingxiao Zhang +6 位作者 Jiaxin Ma Pratteek Das Liangzhu Zhang Hanqing Liu Sen Wang Hui Li Zhong‐Shuai Wu 《Carbon Energy》 SCIE EI CAS CSCD 2024年第8期36-48,共13页
The rapid advancement in the miniaturization,integration,and intelligence of electronic devices has escalated the demand for customizable microsupercapacitors(MSCs)with high energy density.However,efficient microfabri... The rapid advancement in the miniaturization,integration,and intelligence of electronic devices has escalated the demand for customizable microsupercapacitors(MSCs)with high energy density.However,efficient microfabrication of safe and high‐energy MXene MSCs for integrating microelectronics remains a significant challenge due to the low voltage window in aqueous electrolytes(typically≤0.6 V)and limited areal mass loading of MXene microelectrodes.Here,we tackle these challenges by developing a highconcentration(18mol kg^(−1))“water‐in‐LiBr”(WiB)gel electrolyte for MXene symmetric MSCs(M‐SMSCs),demonstrating a record high voltage window of 1.8 V.Subsequently,additive‐free aqueous MXene ink with excellent rheological behavior is developed for three‐dimensional(3D)printing customizable all‐MXene microelectrodes on various substrates.Leveraging the synergy of a highvoltage WiB gel electrolyte and 3D‐printed microelectrodes,quasi‐solid‐state MSMSCs operating stably at 1.8 V are constructed,and achieve an ultrahigh areal energy density of 1772μWhcm^(−2) and excellent low‐temperature tolerance,with a long‐term operation at−40℃.Finally,by extending the 3D printing protocol,M‐SMSCs are integrated with humidity sensors on a single planar substrate,demonstrating their reliability in miniaturized integrated microsystems. 展开更多
关键词 3D printing aqueous electrolyte high voltage micro‐supercapacitors MXene
下载PDF
Sulfolane‑Based Flame‑Retardant Electrolyte for High‑Voltage Sodium‑Ion Batteries
5
作者 Xuanlong He Jie Peng +15 位作者 Qingyun Lin Meng Li Weibin Chen Pei Liu Tao Huang Zhencheng Huang Yuying Liu Jiaojiao Deng Shenghua Ye Xuming Yang Xiangzhong Ren Xiaoping Ouyang Jianhong Liu Biwei Xiao Jiangtao Hu Qianling Zhang 《Nano-Micro Letters》 SCIE EI CAS 2025年第2期498-516,共19页
Sodium-ion batteries hold great promise as next-generation energy storage systems.However,the high instability of the electrode/electrolyte interphase during cycling has seriously hindered the development of SIBs.In p... Sodium-ion batteries hold great promise as next-generation energy storage systems.However,the high instability of the electrode/electrolyte interphase during cycling has seriously hindered the development of SIBs.In particular,an unstable cathode–electrolyte interphase(CEI)leads to successive electrolyte side reactions,transition metal leaching and rapid capacity decay,which tends to be exacerbated under high-voltage conditions.Therefore,constructing dense and stable CEIs are crucial for high-performance SIBs.This work reports localized high-concentration electrolyte by incorporating a highly oxidation-resistant sulfolane solvent with non-solvent diluent 1H,1H,5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether,which exhibited excellent oxidative stability and was able to form thin,dense and homogeneous CEI.The excellent CEI enabled the O3-type layered oxide cathode NaNi_(1/3)Mn_(1/3)Fe_(1/3)O_(2)(NaNMF)to achieve stable cycling,with a capacity retention of 79.48%after 300 cycles at 1 C and 81.15%after 400 cycles at 2 C with a high charging voltage of 4.2 V.In addition,its nonflammable nature enhances the safety of SIBs.This work provides a viable pathway for the application of sulfolane-based electrolytes on SIBs and the design of next-generation high-voltage electrolytes. 展开更多
关键词 Sodium-ion batteries Sulfolane-based electrolyte high voltage Layered oxide cathode Flame retardant
下载PDF
Novel high-voltage cathode for aqueous zinc ion batteries:Porous K_(0.5)VOPO_(4)·1.5H_(2)O with reversible solid-solution intercalation and conversion storage mechanism
6
作者 Liyu Wang Mingliang Zhao +9 位作者 Xiaoyu Zhang Menghua Wu Yu Zong Yu Chen Xinliang Huang Mingjie Xing Xin Ning Wen Wen Daming Zhu Xiaochuan Ren 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第6期71-78,I0003,共9页
Cathode materials that possess high output voltage,as well as those that can be mass-produced using facile techniques,are crucial for the advancement of aqueous zinc-ion battery(ZIBs)applications,Herein,we present for... Cathode materials that possess high output voltage,as well as those that can be mass-produced using facile techniques,are crucial for the advancement of aqueous zinc-ion battery(ZIBs)applications,Herein,we present for the first time a new porous K_(0.5)VOPO_(4)·1.5H_(2)O polyanionic cathode(P-KIVP)with high output voltage(above 1.2 V)that can be manufactured at room temperature using straightforward coprecipitation and etching techniques.The P-KVP cathode experiences anisotropic crystal plane expansion via a sequential solid-solution intercalation and phase co nversion pathway throughout the Zn^(2+)storage process,as confirmed by in-situ synchrotron X-ray diffraction and ex-situ X-ray photoelectron spectroscopy.Similar to other layered vanadium-based polyanionic materials,the P-KVP cathode experiences a progressive decline in voltage during the cycle,which is demonstrated to be caused by the irreversible conversion into amorphous VO_(x).By introducing a new electrolyte containing Zn(OTF)_(2) to a mixed triethyl phosphate and water solution,it is possible to impede this irreversible conversion and obtain a high output voltage and longer cycle life by forming a P-rich cathode electrolyte interface layer.As a proof-of-concept,the flexible fiber-shaped ZIBs based on modified electrolyte woven into a fabric watch band can power an electronic watch,highlighting the application potential of P-KVP cathode. 展开更多
关键词 Aqueous zinc ion battery CATHODE Porous material high voltage platform In-situ synchrotron X-ray diffraction
下载PDF
Analysis of multiple-faults of high-voltage circuit breakers based on non-negative matrix decomposition
7
作者 Yongrong Zhou Zhaoxing Ma +1 位作者 Hao Chen Ruihua Wang 《Global Energy Interconnection》 EI CSCD 2024年第2期179-189,共11页
High-voltage circuit breakers are the core equipment in power networks,and to a certain extent,are related to the safe and reliable operation of power systems.However,their core components are prone to mechanical faul... High-voltage circuit breakers are the core equipment in power networks,and to a certain extent,are related to the safe and reliable operation of power systems.However,their core components are prone to mechanical faults.This study proposes a component separation method to detect multiple mechanical faults in circuit breakers that can achieve online real-time monitoring.First,a model and strategy are presented for obtaining mechanical voiceprint signals from circuit breakers.Subsequently,the component separation method was used to decompose the voiceprint signals of multiple faults into individual component signals.Based on this,the recognition of the features of a single-fault voiceprint signal can be achieved.Finally,multiple faults in high-voltage circuit breakers were identified through an experimental simulation and verification of the circuit breaker voiceprint signals collected from the substation site.The research results indicate that the proposed method exhibits excellent performance for multiple mechanical faults,such as spring structures and loose internal components of circuit breakers.In addition,it provides a reference method for the real-time online monitoring of high-voltage circuit breakers. 展开更多
关键词 high voltage circuit breaker Signal separation MONITOR Multiple faults Power system
下载PDF
A study of pulsed high voltage driven hollow-cathode electron beam sources through synchronous optical trigger
8
作者 霍卫杰 贺伟国 +2 位作者 韩罗峰 朱康武 王锋 《Plasma Science and Technology》 SCIE EI CAS CSCD 2024年第5期82-90,共9页
In this study,a pulsed,high voltage driven hollow-cathode electron beam sources through an optical trigger is designed with characteristics of simple structure,low cost,and easy triggering.To validate the new design,t... In this study,a pulsed,high voltage driven hollow-cathode electron beam sources through an optical trigger is designed with characteristics of simple structure,low cost,and easy triggering.To validate the new design,the characteristics of hollow-cathode discharge and electron beam characterization under pulsed high voltage drive are studied experimentally and discussed by discharge characteristics and analyses of waveform details,respectively.The validation experiments indicate that the pulsed high voltage supply significantly improves the frequency and stability of the discharge,which provides a new solution for the realization of a high-frequency,high-energy electron beam source.The peak current amplitude in the high-energy electron beam increases from 6.2 A to 79.6 A,which indicates the pulsed power mode significantly improves the electron beam performance.Besides,increasing the capacitance significantly affects the highcurrent,lower-energy electron beam more than the high-energy electron beam. 展开更多
关键词 hollow-cathode nanosecond pulsed electron beam sources optical trigger pulsed high voltage supply beam current distribution
下载PDF
Phyllanthuse emblica polyphenols:Optimization of high-voltage pulsed electric field assisted extraction,an antioxidant and anti-inflammatory effects in vitro
9
作者 Lin Ye Wan Luo +7 位作者 Yanfeng Nie Min Chen Qiting Wu Peng Yan Huaiqing Sun Yunlin Pei Chaowan Guo Ying Lin 《Journal of Dermatologic Science and Cosmetic Technology》 2024年第3期32-39,共8页
Background:The polyphenols extraction of Phyllanthus emblica is primarily carried out using organic solvents,and assisted by physical fields such as ultrasound and microwave for extraction.High voltage pulsed electric... Background:The polyphenols extraction of Phyllanthus emblica is primarily carried out using organic solvents,and assisted by physical fields such as ultrasound and microwave for extraction.High voltage pulsed electric field technology(PEF)is a non-thermal processing technology that has high efficiency and minimal damage to thermosensitive substances.PEF has been applied to plant extraction in many studies,however,the extraction of polyphenols from Phyllanthus emblica using the PEF has still not been reported;Objective:This study explores the optimal extraction process of polyphenols from Phyllanthus emblica using the PEF,and investigates its relaxation and anti-wrinkle based on anti-oxidation and anti-inflammatory experiment,in order to develop a Phyllanthus emblica extract with substantial efficacy;Materials and Methods:The method of Phyllanthus emblica extract using PEF is established,and compared with a traditional extraction method.The experimental conditions,such as electric field intensity(0.5–6.0 kV/cm),pulse times(20−120),extraction time(0–60 min)and material concentration(0.5%∼3%),are investigated and optimized using orthogonal experiments;Results:the polyphenols in the Phyllanthus emblica extract were highest at the electric field intensity of 5 kV/cm,120 pulses,extraction time of 30 min,and 2%material concentration.The PEFcontained more polyphenols than the conventional water extraction and ultrasound-assisted extraction.The Phyllanthus emblica extract had substantial antioxidant and anti-inflammatory effects,with a good clearance effect on DPPH(IC50 of 1.82%)and ABTS(IC50 of 1.80%)radicals.At the Phyllanthus emblica extract concentration of 1.25%,inflammatory factors(TNF-α)were reduced by 47.08%;and Conclusion:The PEF is a leading-edge and promising method for preparing Phyllanthus emblica extracts. 展开更多
关键词 Phyllanthus emblica high voltage pulse electric field POLYPHENOLS ANTIOXIDANT ANTI-INFLAMMATORY
下载PDF
Installation and cosmic ray test of the high voltage system of the BESⅢ drift chamber
10
作者 徐美杭 陈昌 +10 位作者 陈元柏 吴智 秦中华 伍灵慧 刘建北 王岚 金艳 刘荣光 朱启明 张健 黄杰 《Chinese Physics C》 SCIE CAS CSCD 北大核心 2008年第12期992-994,共3页
After examination of the designed high voltage power supply system of the BESⅢ drift chamber in the beam test of the full length prototype of drift chamber, a full system covering all the channels of high voltage was... After examination of the designed high voltage power supply system of the BESⅢ drift chamber in the beam test of the full length prototype of drift chamber, a full system covering all the channels of high voltage was installed. The system's training and the high voltage value adjustment were carried out in the cosmic ray test of the BESⅢ drift chamber. The cosmic ray test for the full system and its final installation on the BESⅢ drift chamber were reported. The full system of high voltage power supply works stably and reliably. 展开更多
关键词 BESⅢ drift chamber high voltage system cosmic ray test INSTALLATION
原文传递
Unveiling and Alleviating Chemical“Crosstalk”of Succinonitrile Molecules in Hierarchical Electrolyte for High-Voltage Solid-State Lithium Metal Batteries 被引量:3
11
作者 Fang Fu Ying Liu +4 位作者 Chen Sun Lina Cong Yulong Liu Liqun Sun Haiming Xie 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2023年第3期107-116,共10页
Succinonitrile-based plastic crystal electrolytes have emerged for high-energy-density Li metal batteries in terms of their superior ambient ionic conductivity,low flammability,and benign compatibility with high volta... Succinonitrile-based plastic crystal electrolytes have emerged for high-energy-density Li metal batteries in terms of their superior ambient ionic conductivity,low flammability,and benign compatibility with high voltage cathode,but are hampered by inherent instabilities toward Li anodes.Constructing hierarchical solid electrolytes structure is a fundamental approach to protect Li anode from succinonitrile attacks,with succinonitrile-based oxidation-resistance layer facing high voltage cathode and reduction-tolerant layer contacting Li anode.However,free succinonitrile molecules in succinonitrile-based electrolyte layer can diffuse across the electrolyte/electrolyte interface and further reach Li anode surface during the battery cycle.This chemical“crosstalk”cause reduction-tolerant electrolyte layer to fail to protect the Li anode from the attacks of free succinonitrile molecules.Nano Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12)is introduced creatively into succinonitrile-based electrolyte layer.By taking advantage of the complexation between La atoms in Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12)and N atoms in succinonitrile,the free succinonitrile molecules are successfully immobilized in succinonitrile-based electrolyte layer.The resulting low resistance and highly durable solid electrolyte interphase and cathode electrolyte interphase endow NCM622||Li batteries with remarkable cycle stability.Our research provides a new idea for the real application of plastic crystal electrolytes in high voltage solid-state lithium metal batteries. 展开更多
关键词 hierarchical solid electrolytes high voltage interface lithium metal plastic crystal
下载PDF
Boosting High-Voltage Dynamics Towards High-Energy-Density Lithium-Ion Capacitors 被引量:3
12
作者 Junfeng Huang Xin Lu +9 位作者 Teng Sun Daiyao Yu Zhong Xu Yanting Xie Xinglin Jiang Yongbin Wang Shenglong Wang Xiong Zhang Weiqing Yang Haitao Zhang 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2023年第4期211-217,共7页
Lithium-ion capacitors(LICs)are becoming important electrochemical energy storage systems due to their great potential to bridge the gap between supercapacitors and lithium-ion batteries.However,capacity lopsidedness ... Lithium-ion capacitors(LICs)are becoming important electrochemical energy storage systems due to their great potential to bridge the gap between supercapacitors and lithium-ion batteries.However,capacity lopsidedness and low output voltage greatly hinder the realization of high-energy-density LICs.Herein,a strategy of balancing capacity towards fastest dynamics is proposed to enable high-voltage LICs.Through electrochemical prelithiation of Nb_(2)C to be 1.1 V with 165 mAh g^(-1),Nb_(2)C//LiFePO_(4) LICs show a broadened potential window from 3.0 to 4.2 V and an according high energy density of 420 Wh kg^(-1).Moreover,the underlying mechanism between prelithiation and high voltage is disclosed by electrochemical dynamic analysis.Prelithiation declines the Nb_(2)C anode potential that facilitates electron transmission in the interlayer of two-dimensional Nb_(2)C MXene.This effect induces small drive force for Li^(+)ions deposition and hence weakens the repulsive force from adsorbed ions on the electrode surface.Benefiting from even more Li^(+)ions deposition,a higher voltage is eventually delivered.In addition,prelithiation significantly increases Coulomb efficiency of the 1st cycle from 74%to 90%,which is crucial to commercial application of LICs. 展开更多
关键词 electrochemical dynamics high voltage lithium-ion capacitors Nb2C MXene prelithiation
下载PDF
A UV cross-linked gel polymer electrolyte enabling high-rate and high voltage window for quasi-solid-state supercapacitors 被引量:1
13
作者 Yuge Bai Chao Yang +6 位作者 Boheng Yuan Hongjie Li Weimeng Chen Haosen Yin Bin Zhao Fei Shen Xiaogang Han 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第1期41-50,I0002,共11页
Serving as a promising alternative to liquid electrolyte in the application of portable and wearable devices,gel polymer electrolytes(GPEs)are expected to obtain more preferable properties rather than just be satisfie... Serving as a promising alternative to liquid electrolyte in the application of portable and wearable devices,gel polymer electrolytes(GPEs)are expected to obtain more preferable properties rather than just be satisfied with the merits of high safety and deformability.Here,an easy-operated method is employed to fabricate cross-linked composite polymer membranes used for GPEs assisted by UV irradiation,in which N-doped carbon quantum dots(N-CQDs)and TiO2are introduced as photocatalysts and additives to improve the performances of GPEs.Specifically,N-CQDs participate as a cross-linker to construct the inner porous structure,and TiO2nanoparticles serve as a stabilizer to improve the electrochemical stability of GPEs under high voltage(3.5 V).The excellent thermal and mechanical stability of the membrane fabricated in this work guarantee the safety of the supercapacitors(SCs).This GPE based SC not only exhibits prominent rate performance(105%capacitance retention at the current density of 40A g^(-1))and cyclic stability(85%at 1 A g^(-1)under 3.5 V after 20,000 cycles),but also displays remarkable energy density(42.88 Wh kg^(-1))with high power density(19.3 k W kg^(-1)).Moreover,the superior rate and cycling performances of the as-prepared GPE based flexible SCs under flat and bending state confirm the feasibility of its application in flexible energy storage devices. 展开更多
关键词 Gel polymer electrolyte UV cross-linking Energy density high voltage window
下载PDF
High-Voltage Aqueous Zinc Batteries Achieved by Tri-functional Metallic Bipolar Electrodes 被引量:1
14
作者 Chang Liu Xiaowei Chi +1 位作者 Cheng Yang Yu Liu 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2023年第1期360-367,共8页
Aqueous rechargeable zinc batteries are very attractive for energy storage applications due to their low cost and high safety.However,low operating voltages limit their further development.For the first time,this work... Aqueous rechargeable zinc batteries are very attractive for energy storage applications due to their low cost and high safety.However,low operating voltages limit their further development.For the first time,this work proposes a unique approach to increase the voltages of aqueous zinc batteries by using tri-functional metallic bipolar electrode with good electrochemical activity and ultrahigh electronic conductivity,which not only participates in redox reactions,but also functions as an electrical highway for charge transport.Furthermore,bipolar electrode can replace expensive ion selective membrane to separate electrolytes with different pH;thus,redox couples with higher potential in acid condition and Zn=Zn(OH)^(2-)_(4) couple with lower potential in alkaline condition can be employed together,leading to high voltages of aqueous zinc batteries.Herein,two types of metallic bipolar electrodes of Cu and Ag are utilized based on three kinds of aqueous zinc batteries:Zn–MnO_(2),Zn–I_(2),and Zn–Br_(2).The voltage of aqueous Zn–MnO_(2) battery is raised to 1.84 V by employing one Cu bipolar electrode,which shows no capacity attenuation after 3500 cycles.Moreover,the other Ag bipolar electrode can be adopted to successfully construct Zn–I_(2) and Zn–Br_(2) batteries exhibiting much higher voltages of 2.44 and 2.67 V,which also show no obvious capacity degradation for 1000 and 800 cycles,representing decent cycle stability.Since bipolar electrode can be applied in a large family of aqueous batteries,this work offers an elaborate high-voltage concept based on tri-functional metallic bipolar electrode as a model system to open a door to explore high-voltage aqueous batteries. 展开更多
关键词 aqueous zinc battery high voltage metallic bipolar electrode
下载PDF
Rationally designing electrolyte additives for highly improving cyclability of LiNi_(0.5)Mn_(1.5)O_(4)/Graphite cells 被引量:1
15
作者 Zhiyong Xia Kuan Zhou +8 位作者 Xiaoyan Lin Zhangyating Xie Qiurong Chen Xiaoqing Li Jie Cai Suli Li Hai Wang Mengqing Xu Weishan Li 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第4期266-275,共10页
High voltage is necessary for high energy lithium-ion batteries but difficult to achieve because of the highly deteriorated cyclability of the batteries.A novel strategy is developed to extend cyclability of a high vo... High voltage is necessary for high energy lithium-ion batteries but difficult to achieve because of the highly deteriorated cyclability of the batteries.A novel strategy is developed to extend cyclability of a high voltage lithium-ion battery,LiNi_(0.5)Mn_(1.5)O_(4)/Graphite(LNMO/Graphite)cell,which emphasizes a rational design of an electrolyte additive that can effectively construct protective interphases on anode and cathode and highly eliminate the effect of hydrogen fluoride(HF).5-Trifluoromethylpyridine-trime thyl lithium borate(LTFMP-TMB),is synthesized,featuring with multi-functionalities.Its anion TFMPTMB-tends to be enriched on cathode and can be preferentially oxidized yielding TMB and radical TFMP-.Both TMB and radical TFMP can combine HF and thus eliminate the detrimental effect of HF on cathode,while the TMB dragged on cathode thus takes a preferential oxidation and constructs a protective cathode interphase.On the other hand,LTFMP-TMB is preferentially reduced on anode and constructs a protective anode interphase.Consequently,a small amount of LTFMP-TMB(0.2%)in 1.0 M LiPF6in EC/DEC/EMC(3/2/5,wt%)results in a highly improved cyclability of LNMO/Graphite cell,with the capacity retention enhanced from 52%to 80%after 150 cycles at 0.5 C between 3.5 and 4.8 V.The as-developed strategy provides a model of designing electrolyte additives for improving cyclability of high voltage batteries. 展开更多
关键词 Electrolyte additive Design and synthesis CYCLABILITY high voltage batteries Cathode and anode interphases
下载PDF
Improvement of circuit oscillation generated by underwater high voltage pulse discharges based on pulse power thyristor
16
作者 于营波 康忠健 《Plasma Science and Technology》 SCIE EI CAS CSCD 2023年第3期150-160,共11页
High voltage fracturing technology was widely used in the field of reservoir reconstruction due to its advantages of being clean, pollution-free, and high-efficiency. However, high-frequency circuit oscillation occurs... High voltage fracturing technology was widely used in the field of reservoir reconstruction due to its advantages of being clean, pollution-free, and high-efficiency. However, high-frequency circuit oscillation occurs during the underwater high voltage pulse discharge process, which brings security risks to the stability of the pulse fracturing system. In order to solve this problem, an underwater pulse power discharge system was established, the circuit oscillation generation conditions were analyzed and the circuit oscillation suppression method was proposed. Firstly, the system structure was introduced and the charging model of the energy storage capacitor was established by the state space average method. Next, the electrode high-voltage breakdown model was established through COMSOL software, the electrode breakdown process was analyzed according to the electron density distribution image, and the plasma channel impedance was estimated based on the conductivity simulation results. Then the underwater pulse power discharge process and the circuit oscillation generation condition were analyzed, and the circuit oscillation suppression strategy of using the thyristor to replace the gas spark switch was proposed. Finally, laboratory experiments were carried out to verify the precision of the theoretical model and the suppression effect of circuit oscillation. The experimental results show that the voltage variation of the energy storage capacitor, the impedance change of the pulse power discharge process, and the equivalent circuit in each discharge stage were consistent with the theoretical model. The proposed oscillation suppression strategy cannot only prevent the damage caused by circuit oscillation but also reduce the damping oscillation time by77.1%, which can greatly improve the stability of the system. This research has potential application value in the field of underwater pulse power discharge for reservoir reconstruction. 展开更多
关键词 underwater high voltage pulse discharge circuit oscillation suppression state space average method pulse power thyristor
下载PDF
Synthesis and electrochemical performance of La_(2)CuO_(4)as a promising coating material for high voltage Li-rich layered oxide cathodes
17
作者 郭福亮 卢嘉泽 +4 位作者 苏美华 陈约 郑杰允 尹良 李泓 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第8期124-132,共9页
The structural transformations,oxygen releasing and side reactions with electrolytes on the surface are considered as the main causes of the performance degradation of Li-rich layered oxides(LROs)cathodes in Li-ion ba... The structural transformations,oxygen releasing and side reactions with electrolytes on the surface are considered as the main causes of the performance degradation of Li-rich layered oxides(LROs)cathodes in Li-ion batteries.Thus,stabilizing the surfaces of LROs is the key to realize their practical application in high energy density Li-ion batteries.Surface coating is regarded as one of the most effective strategies for high voltage cathodes.The ideal coating materials should prevent cathodes from electrolyte corrosion and possess both electronic and Li-ionic conductivities simultaneously.However,commonly reported coating materials are unable to balance these functions well.Herein,a new type of coating material,La_(2)CuO_(4)was introduced to mitigate the surface issues of LROs for the first time,due to its superb electronic conductivity(26-35 mS·cm^(-1))and lithium-ionic diffusion coefficient(10^(-12)-10^(-13)cm^(2)·s^(-1)).After coating with the La_(2)CuO_(4),the capacity retention of Li_(1.2)Ni_(0.54)Co_(0.13)Mn_(0.13)O_(2)cathode was increased to 85.9%(compared to 79.3%of uncoated cathode)after 150 cycles in the voltage range of 2.0-4.8 V.In addition,only negligible degradations on the deliverable capacity and rate capability were observed. 展开更多
关键词 La_(2)CuO_(4) electronic conductivity Li-ionic conductivity Li-rich layered oxides high voltage
下载PDF
Manipulating Zn^(2+)solvation environment in poly(propylene glycol)-based aqueous Li^(+)/Zn^(2+)electrolytes for high-voltage hybrid ion batteries
18
作者 Hang Lu Sheng Zheng +2 位作者 Lu Wei Xiaodong Zhang Xin Guo 《Carbon Energy》 SCIE EI CAS CSCD 2023年第12期125-136,共12页
Compared with aqueous single-ion batteries,rechargeable aqueous hybrid ion batteries,especially Li^(+)/Zn^(2+)hybrid ion batteries,are receiving extensive interest owing to their low cost,high operating voltage,and en... Compared with aqueous single-ion batteries,rechargeable aqueous hybrid ion batteries,especially Li^(+)/Zn^(2+)hybrid ion batteries,are receiving extensive interest owing to their low cost,high operating voltage,and energy density.However,their working voltage and lifespan are limited by the decomposition of water and the growth of Zn dendrites.Herein,detrimental side reactions induced by the water reduction and the Zn dendrite growth are successfully suppressed by a poly(propylene glycol)(PPG)-based hybrid ion electrolyte[(1 m Zn(TFSI)2+10 m LiTFSI)in PPG/H2O].The addition of PPG in the electrolyte can not only enhance the bonding strength of hydrogen-bond in water but also tailor the solvation sheath of Zn2+as revealed by synchrotron X-rays.The participated solvation of PPG with Zn^(2+)can weaken Zn-H_(2)O interactions and redistribute Zn^(2+)flux on the surface of the Zn anode,thus inducing favorably even deposition of Zn.In addition,the decomposition of TFSI-contributes a ZnF_(2)-enriched solid electrolyte interface at the Zn anode to further prevent water decomposition and restrain Zn dendrites.The PPG-based electrolyte enables 2.1 V LiMnO_(2)//Zn batteries to deliver high specific capacities(121.7 mAh g^(-1)for a coin cell and 90 mAh g^(-1)for a pouch cell),and maintain 80%of the capacity over 700 cycles at 0.5 C,suggesting a promising pathway for highly reversible aqueous hybrid ion batteries. 展开更多
关键词 high voltage aqueous electrolyte hybrid ion battery molecular interaction poly(propylene glycol) zinc metal anode
下载PDF
HIGH VOLTAGE SAFETY MANAGEMENT SYSTEM OF ELECTRIC VEHICLE 被引量:3
19
作者 QIANG Jiaxi AO Guoqiang YANG Lin 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2008年第6期63-68,共6页
In order to improve the drivability and energy efficiency of electric vehicle (EV), more and more batteries are connected in series with high voltage which makes it necessary to monitor the electric parameters of hi... In order to improve the drivability and energy efficiency of electric vehicle (EV), more and more batteries are connected in series with high voltage which makes it necessary to monitor the electric parameters of high voltage system (HVS) to ensure the high voltage safety. A high voltage safety management system is developed to solve this critical issue. Several key electric parameters including pre-charge, contact resistance, insulation resistance and remaining capacity are monitored and analyzed based on the presented equivalent models. An electronic unit called high voltage safety controller is developed. By the help of hardware-in-loop system, the equivalent models integrated in the high voltage safety controller are validated and the on-line electric parameters monitor strategy is discussed. The real vehicle experiment results indicate that the high voltage safety management system designed is suitable for EV application. 展开更多
关键词 high voltage safety Pre-charge Contact resistance Insulation resistance Remaining capacity
下载PDF
Degradation mechanism of high-voltage single-crystal LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) cathode material
20
作者 柳娜 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第12期618-622,共5页
Layered cathode materials have been successfully commercialized and applied to electric vehicles.To further improve improve the energy density of these marterials is still the main efforts in the market.Therefore,deve... Layered cathode materials have been successfully commercialized and applied to electric vehicles.To further improve improve the energy density of these marterials is still the main efforts in the market.Therefore,developing high-voltage LiNi_(x)Co_(y)Mn_(z)O_(2)(x+y+z=1,NCM)to achieve high energy density is particularly important.However,under high voltage cycling,NCM often exhibits rapid capacity degradation,which can be attributed to oxygen release,structural phase transition and particle cracking.In this work,the representative single-crystal LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)(NCM523)was studied under various high charge cut-off voltages.Analysis by x-ray diffraction(XRD),transmission electron microscope(TEM)and electron back scatter diffraction(EBSD)measurements indicated that the rock-salt phase is formed on the surface of the particles after high voltage cycling,which is responsible for the increase of impedance and the rapid decay of capacity.Therefore,inhibiting the formation of rock-salt phase is believed an effective strategy to address the failure of NCM under high voltages.These findings provide effective guidance for the development of high-voltage NCM. 展开更多
关键词 high voltage Li-ion battery phase transition LiNi_(x)Co_(y)Mn_(z)O_(2)
下载PDF
上一页 1 2 13 下一页 到第
使用帮助 返回顶部