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负氧化还原电位电解水冷泡绿茶茶汤理化特性、抗氧化性能及香气成分研究 被引量:2
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作者 夏瑞 钟耕 +2 位作者 李恬 杨万富 高羽歌 《食品工业科技》 CAS 北大核心 2022年第15期89-97,共9页
以瓶装饮用天然水冷泡绿茶和常规热泡绿茶作为对比,探讨负氧化还原电位电解水对冷泡绿茶茶汤品质的影响,以期为得到活性成分含量高及抗氧化活性强的冷泡绿茶饮品提供新选择。通过调节电解饮用水时间电解生成不同负氧化还原电位电解水1... 以瓶装饮用天然水冷泡绿茶和常规热泡绿茶作为对比,探讨负氧化还原电位电解水对冷泡绿茶茶汤品质的影响,以期为得到活性成分含量高及抗氧化活性强的冷泡绿茶饮品提供新选择。通过调节电解饮用水时间电解生成不同负氧化还原电位电解水1和2;通过紫外分光光度法、高效液相色谱法以及顶空固相微萃取与气相色谱-质谱联用法测定并比较负氧化还原电位电解水、瓶装饮用天然水冷泡绿茶和常规热泡绿茶茶汤基本理化指标、主要活性成分含量、抗氧化性、感官品质和香气成分。结果表明,负氧化还原电位电解水冷泡绿茶茶汤pH呈弱碱性,氧化还原电位为负值,可溶性固形物含量及茶汤浸提率显著高于瓶装饮用天然水冷泡绿茶(P<0.05),与常规热泡茶相当;电解水制得茶汤色度黄绿明亮,汤色品质高;电解水茶汤多酚含量显著高于瓶装饮用天然水冷泡,且电解水样2显著高于常规热泡(P<0.05),游离氨基酸总量显著高于瓶装饮用天然水冷泡以及常规热泡(P<0.05),咖啡碱含量低于常规热泡,儿茶素类含量均高于瓶装饮用天然水冷泡,除EGCG和EGC外均高于常规热泡;电解水冷泡茶茶汤抗氧化能力显著高于其他两种绿茶茶汤(P<0.05);电解水冷泡茶汤感官评分最高且茶汤香气成分最为丰富醇和。实验初步验证了负氧化还原电位电解水用作冷泡绿茶加工用水可行性,且筛选出电解水样2制得绿茶茶汤生化成分高、抗氧化活性强且感官评价得分高、香气清香持久。 展开更多
关键词 氧化还原电位电解 冷泡绿茶 活性成分 抗氧化活性 香气成分
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铝电解生产中均衡调节电解槽负压分析 被引量:1
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作者 苏义鹏 《世界有色金属》 2021年第8期11-12,共2页
本文以铝电解生产中均衡调节电解槽负压分析为题,对调节阀到电解槽之间支烟管段检测点压力进行测量,并以控制检测点压力大小为手段,实现调节电解槽负压的目的。在均衡调节电解槽负压后,其转氟含量由之前的0.82%~0.95%变为0.9%~1.25%了,... 本文以铝电解生产中均衡调节电解槽负压分析为题,对调节阀到电解槽之间支烟管段检测点压力进行测量,并以控制检测点压力大小为手段,实现调节电解槽负压的目的。在均衡调节电解槽负压后,其转氟含量由之前的0.82%~0.95%变为0.9%~1.25%了,在降低氟化铝的能耗后,铝电解生产成本也大幅度下降。 展开更多
关键词 电解 均衡调节 电解
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铝电解生产中均衡调节电解槽负压的探索 被引量:1
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作者 何智军 陈金辉 陆国磊 《有色冶金节能》 2019年第1期29-33,共5页
以某电解铝厂420 kA电解槽为例,在理论计算的基础上,通过调节电解槽支烟管阀门开启角度的大小,测量调节阀至电解槽之间支烟管段检测点压力,然后通过对该压力大小的控制,实现对电解槽膛内负压大小的调节,确定其生产所需的负压为270~300... 以某电解铝厂420 kA电解槽为例,在理论计算的基础上,通过调节电解槽支烟管阀门开启角度的大小,测量调节阀至电解槽之间支烟管段检测点压力,然后通过对该压力大小的控制,实现对电解槽膛内负压大小的调节,确定其生产所需的负压为270~300 Pa。均衡调节电解槽负压后,载氟含量由调节前的0. 82%~0. 95%提升到0. 9%~1. 25%,氟化铝单耗下降了2. 3 kg/t-Al,节约成本约349万元。 展开更多
关键词 电解 电解 均衡调节 支烟管阀门
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Electrolyte engineering for optimizing anode/electrolyte interface towards superior aqueous zinc-ion batteries:A review
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作者 Hua-ming YU Dong-ping CHEN +6 位作者 Li-jin ZHANG Shao-zhen HUANG Liang-jun ZHOU Gui-chao KUANG Wei-feng WEI Li-bao CHEN Yue-jiao CHEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第10期3118-3150,共33页
Aqueous zinc-ion batteries(AZIBs) are promising candidates for the large-scale energy storage systems due to their high intrinsic safety,cost-effectiveness and environmental friendliness.However,issues such as dendrit... Aqueous zinc-ion batteries(AZIBs) are promising candidates for the large-scale energy storage systems due to their high intrinsic safety,cost-effectiveness and environmental friendliness.However,issues such as dendrite growth,hydrogen evolution reaction,and interfacial passivation occurring at the anode/electrolyte interface(AEI) have hindered their practical application.Constructing a stable AEI plays a key role in regulating zinc deposition and improving the cycle life of AZIBs.The fundamentals of AEI and the challenges faced by the Zn anode due to unstable interfaces are discussed.A comprehensive summary of electrolyte regulation strategies by electrolyte engineering to achieve a stable Zn anode is provided.The effectiveness evaluation techniques for stable AEI are also analyzed,including the interfacial chemistry and surface morphology evolution of the Zn anode.Finally,suggestions and perspectives for future research are offered about enabling a durable and stable AEI via electrolyte engineering,which may pave the way for developing high-performance AZIBs. 展开更多
关键词 aqueous zinc-ion battery anode/electrolyte interface zinc anode aqueous electrolyte electrolyte engineering electrolyte additives
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采用电镀铜充填盲导通孔工艺 被引量:1
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作者 蔡积庆 《印制电路信息》 2003年第8期43-45,50,共4页
概述了采用电镀铜充填盲导通孔的积层板制造工艺,可以在短时间内完全填充盲导通孔内部,不含残留空隙, 可以获得高导电性和高可靠性的填充盲导通孔。
关键词 电镀铜 盲导通孔 积层板 制造工艺 电解 负电解 印制电路板
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Designing Conformal Electrode-electrolyte Interface by Semi-solid NaK Anode for Sodium Metal Batteries
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作者 YIN Chunsen CHEN Zeyuan WANG Xiuli 《材料科学与工程学报》 CAS CSCD 北大核心 2024年第4期533-543,共11页
Solid-state Na metal batteries(SSNBs),known for its low cost,high safety,and high energy density,hold a significant position in the next generation of rechargeable batteries.However,the urgent challenge of poor interf... Solid-state Na metal batteries(SSNBs),known for its low cost,high safety,and high energy density,hold a significant position in the next generation of rechargeable batteries.However,the urgent challenge of poor interfacial contact in solid-state electrolytes has hindered the commercialization of SSNBs.Driven by the concept of intimate electrode-electrolyte interface design,this study employs a combination of NaK alloy and carbon nanotubes to prepare a semi-solid NaK(NKC)anode.Unlike traditional Na anodes,the paintable paste-like NKC anode exhibits superior adhesion and interface compatibility with both current collectors and gel electrolytes,significantly enhancing the intimate contact of electrode-electrolyte interface.Additionally,the filling of SiO_(2)nanoparticles improves the wettability of NaK alloy on gel polymer electrolytes,further achieving a conformal interface contact.Consequently,the overpotential of the NKC symmetric cell is markedly lower than that of the Na symmetric cell when subjected to a long cycle of 300 h.The full cell coupled with Na_(3)V_(3)(PO_(4))_(2)cathodes had an initial discharge capacity of 106.8 mAh·g^(-1)with a capacity retention of 89.61%after 300 cycles,and a high discharge capacity of 88.1 mAh·g^(-1)even at a high rate of 10 C.The outstanding electrochemical performance highlights the promising application potential of the NKC electrode. 展开更多
关键词 Solid-state Na metal battery NaK alloy Gel electrolyte electrode-electrolyte interface dendrite free anode
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Influence of CsNO_3 as electrolyte additive on electrochemical property of lithium anode in rechargeable battery 被引量:4
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作者 LIN Hua CHEN Kang-hua +2 位作者 SHUAI Yi HE Xuan GE Ke 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第4期719-728,共10页
Lithium metal is one of the most promising anode materials for rechargeable battery with high energy density,but its practical use is still hindered by two main problems,namely,lithium dendrite growth and low Coulombi... Lithium metal is one of the most promising anode materials for rechargeable battery with high energy density,but its practical use is still hindered by two main problems,namely,lithium dendrite growth and low Coulombic efficiency.To address the issues,cesium nitrate(CsNO3)is selected as the additive to modify the electrolyte for lithium secondary battery.Here we report electrochemical performance of lithium secondary battery with different concentration of CsNO3 as electrolyte additive.The study result demonstrates that Coulombic efficiency of Li–Cu cells and the lifetime of symmetric lithium cells contained CsNO3 additive are improved greatly.Li–Cu cell with 0.05 mol/L CsNO3 and 0.15 mol/L LiNO3 as electrolyte additive presents the best electrochemical performance,having the highest Coulombic efficiency of around 97%and the lowest interfacial resistance.With increasing the concentration of CsNO3 as electrolyte additive,the electrochemical performance of cells becomes poor.Meanwhile,the morphology of lithium deposited films with CsNO3-modified electrolyte become smoother and more uniform compared with the basic electrolyte. 展开更多
关键词 cesium nitrate lithium anode electrolyte additive Coulombic efficiency electrochemical properties MORPHOLOGY
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Fabrication and anodic polarization behavior of lead-based porous anodes in zinc electrowinning 被引量:3
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作者 衷水平 赖延清 +4 位作者 蒋良兴 吕晓军 陈佩如 李劼 刘业翔 《Journal of Central South University of Technology》 EI 2008年第6期757-762,共6页
A new type of lead-based porous anode in zinc electrowinning was prepared by negative pressure infiltration. The anodic polarization potential and corrosion rate were studied and compared with those of traditional fia... A new type of lead-based porous anode in zinc electrowinning was prepared by negative pressure infiltration. The anodic polarization potential and corrosion rate were studied and compared with those of traditional fiat anodes (Pb-0.8%Ag) used in industry. The anode corrosion rate was determined by anode actual current density and microstructure. The results show that the anodic oxygen evolution potential decreases first and then increases with the decrease of pore diameter. The anodic potential decreases to the lowest value of 1.729 V at the pore diameter of 1.25-1.60 mm. The porous anode can decrease its actual current density and thus decrease the anodic corrosion rate. When the pore diameter is 1.60-2.00 mm, the anodic relative corrosion rate reaches the lowest value of 52.1%. 展开更多
关键词 zinc electrowinning negative pressure infiltration porous anode anode potential corrosion rate
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Mechanism of negative capacitance in LEDs
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作者 FENG Lie-feng ZHU Chuan-yun +2 位作者 CHEN Yong ZENG Zhi-bin WANG Cun-da 《Optoelectronics Letters》 EI 2005年第2期127-130,共4页
In order to explain the phenomenon of negative capacitance(NC) in light emitting diodes LEDs, we present a new model based on local strong recombination in active region and firstly deduce the analytic expression of... In order to explain the phenomenon of negative capacitance(NC) in light emitting diodes LEDs, we present a new model based on local strong recombination in active region and firstly deduce the analytic expression of NO from continuity equation. The theoretical result indicates that the NC effect becomes stronger when the carrier recombination rate increases in a certain range,which is consistent with the experimental result. Accordingly,we confirm that the NO is caused by carrier recombination in active reaion instead of by other exterior factors. 展开更多
关键词 发光二极管 电容 LED 解析表达 连续性方程
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Binding Energy of an Off-Center D^-in a Spherical Quantum Dot
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作者 LIU Dong-Ming XIE Wen-Fang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第5期919-922,共4页
Using the method of matrix diagonalization, we investigate an off-center D^- in a spherical quantum dot (QD) subjected to a parabolic potential confinement. We discuss the effect of the position of an impurity in th... Using the method of matrix diagonalization, we investigate an off-center D^- in a spherical quantum dot (QD) subjected to a parabolic potential confinement. We discuss the effect of the position of an impurity in the QD on the binding energy of the D system, Eurthermore, we compare a negatively charged donor D^- with a neutral donor DO confined by a spherical QD with a parabolic potentiM. The results have clearly demonstrate the so-called quantum size effect. The binding energy is dependent on the confining potential hw0 and the impurity ion distance D. 展开更多
关键词 quantum dots DONOR
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Shocks and Solitons in Ultradense Degenerate Electron-Positron-Ion Plasmas
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作者 S.A.Khan Arshad M.Mirza 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第1期151-157,共7页
The formation and propagation of shocks and solitons are investigated in an unmagnetized, ultradense plasma containing degenerate Fermi gas of electrons and positrons, and classical ion gas by employing Thomas-Fermi m... The formation and propagation of shocks and solitons are investigated in an unmagnetized, ultradense plasma containing degenerate Fermi gas of electrons and positrons, and classical ion gas by employing Thomas-Fermi model. For this purpose, a deformed Korteweg-de Vries-Berger (dKdVB) equation is derived using the reductive perturbative technique for cold, adiabatic, and isothermal ions. Localized analytical solutions of dKdVB equation in planar geometry are obtained for dispersion as well as dissipation dominant cases. For nonplanar (cylindrical and spherical) geometry, time varying numerical shock wave solution of dKdVB equation is found. Its dispersion dominant case leading to the soliton solution is also discussed. The effect of ion temperature, positron concentration and dissipation is found significant on these nonlinear structures. The relevance of the results to the systems of scientific interest is pointed out. 展开更多
关键词 degenerate plasma nonplanar geometry SHOCKS SOLITONS
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Animal Behavior in a Fully Automatically Controlled Dairy Farm
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作者 Anja Graiff Renate Luise Dorfler +2 位作者 Manfred Hold Jorn Stumpenhausen Heinz Bernhardt 《Journal of Agricultural Science and Technology(A)》 2015年第1期61-67,共7页
As there are increasing numbers of small farms in Germany, it is necessary for them, to keep the workload as small as possible by enhancing the use of automatism. Important as those energetic-technical capabilities an... As there are increasing numbers of small farms in Germany, it is necessary for them, to keep the workload as small as possible by enhancing the use of automatism. Important as those energetic-technical capabilities and features in a modem dairy farm are, the final decision when using automatic machinery depends on the animal itself and its behavior. As a result, all animal-physiological criteria, animal protection and animal welfare have to be taken into consideration. Therefore tests have been done to investigate dairy cattle behavior on suddenly occurring energy failures, fluctuations or postponements due to a load management. The experiments have been taken in four different stables. In each stable, 12 "focus cows" have been selected. Their daily stress response was measured by a heart rate monitor and faecal cortisol metabolites. Video observation showed modifications in behavior, escape or avoidance reactions; pedometers recorded the movement activity. These scientific experiments will demonstrate cattle behavior in situations driven by a power load management, but no statistically significant effects on the usual daily routine are being expected. 展开更多
关键词 Cattle behavior CORTISOL heart rate variability power load management smart grid Germany.
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Ferroresonance at Open Phase Operating Conditions of Power Transformers
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作者 Hani Obeid 《Journal of Energy and Power Engineering》 2012年第10期1714-1717,共4页
The reliability of electric supply to consumers is one of the most important factors that determine the requirements imposed on modem utility companies. This paper presents the results of investigation by computer sof... The reliability of electric supply to consumers is one of the most important factors that determine the requirements imposed on modem utility companies. This paper presents the results of investigation by computer software of the overvoltages resulting from a ferroresonance conditions in MV networks at open phase operating condition with and without connection to earth on source and load sides of distribution transformer. This overvoltage may reach 4.2 pu on one of the HV side of transformer unswitched phases. The results of the study show that ferroresonance overvoltage may be controlled by replacing fuses with circuit breakers on HV side to ensure switching-off all phases. Insertion of resistor or reactor in the neutral of source and loadsides of the transformer with 5% active load will help in suppressing overvoltages. 展开更多
关键词 FERRORESONANCE OVERVOLTAGE open phase operating condition non-linear inductance.
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Waterproof lithium metal anode enabled by cross-linking encapsulation 被引量:9
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作者 Ye Xiao Rui Xu +3 位作者 Chong Yan Yeru Liang Jun-Fan Ding Jia-Qi Huang 《Science Bulletin》 SCIE EI CAS CSCD 2020年第11期909-916,M0003,M0004,共10页
Lithium (Li) metal is considered as the ultimate anode choice for developing next-generation high-energy batteries. However, the poor tolerance against moist air and the unstable solid electrolyte interphases (SEI) in... Lithium (Li) metal is considered as the ultimate anode choice for developing next-generation high-energy batteries. However, the poor tolerance against moist air and the unstable solid electrolyte interphases (SEI) induced by the intrinsic high reactivity of lithium bring series of obstacles such as the rigorous operating condition, the poor electrochemical performance, and safety anxiety of the cell, which to a large extent hinder the commercial utilization of Li metal anode. Here, an effective encapsulation strategy was reported via a facile drop-casting and a following heat-assisted cross-linking process. Benefiting from the inherent hydrophobicity and the compact micro-structure of the cross-linked poly(vinylidene-co-hex afluoropropylene) (PVDF–HFP), the as-encapsulated Li metal exhibited prominent stability toward moisture, as well corroborated by the evaluations both under the humid air at 25 °C with 30% relative humidity (RH) and pure water. Moreover, the encapsulated Li metal anode exhibits a decent electrochemical performance without substantially increasing the cell polarization due to the uniform and unblocked ion channels, which originally comes from the superior affinity of the PVDF–HFP polymer toward nonaqueous electrolyte. This work demonstrates a novel and valid encapsulation strategy for humiditysensitive alkali metal electrodes, aiming to pave the way for the large-scale and low-cost deployment of the alkali metal-based high-energy-density batteries. 展开更多
关键词 Lithium metal anode Polymer encapsulation Interfacial protection Water-stable Air-stable Cross-linking
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Advanced flame-retardant electrolyte for highly stabilized K-ion storage in graphite anode 被引量:4
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作者 Hao-Jie Liang Zhen-Yi Gu +8 位作者 Xin-Xin Zhao Jin-Zhi Guo Jia-Lin Yang Wen-Hao Li Bao Li Zhi-Ming Liu Zhong-Hui Sun Jing-Ping Zhang Xing-Long Wu 《Science Bulletin》 SCIE EI CAS CSCD 2022年第15期1581-1588,M0004,共9页
Although graphite anodes operated with representative de/intercalation patterns at low potentials are considered highly desirable for K-ion batteries,the severe capacity fading caused by consecutive reduction reaction... Although graphite anodes operated with representative de/intercalation patterns at low potentials are considered highly desirable for K-ion batteries,the severe capacity fading caused by consecutive reduction reactions on the aggressively reactive surface is inevitable given the scarcity of effective protecting layers.Herein,by introducing a flame-retardant localized high-concentration electrolyte with retentive solvation configuration and relatively weakened anion-coordination and non-solvating fluorinated ether,the rational solid electrolyte interphase characterized by well-balanced inorganic/organic components is tailored in situ.This effectively prevented solvents from excessively decomposing and simultaneously improved the resistance against K-ion transport.Consequently,the graphite anode retained a prolonged cycling capability of up to 1400 cycles(245 mA h g,remaining above 12 mon)with an excellent capacity retention of as high as 92.4%.This is superior to those of conventional and high-concentration electrolytes.Thus,the optimized electrolyte with moderate salt concentration is perfectly compatible with graphite,providing a potential application prospect for K-storage evolution. 展开更多
关键词 Graphite anode K-ion batteries Localized high-concentration electrolyte Interphase modification
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Tuning Zn^(2+) coordination tunnel by hierarchical gel electrolyte for dendrite-free zinc anode 被引量:11
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作者 Bingyao Zhang Liping Qin +5 位作者 Yun Fang Yizhao Chai Xuesong Xie Bingan Lu Shuquan Liang Jiang Zhou 《Science Bulletin》 SCIE EI CSCD 2022年第9期955-962,M0004,共9页
Aqueous zinc-ion batteries(ZIBs)are perceived as one of the most upcoming grid-scale storage systems.However,the issues of electrode dissolution,dendrite formation,and corrosion in traditional liquid electrolytes have... Aqueous zinc-ion batteries(ZIBs)are perceived as one of the most upcoming grid-scale storage systems.However,the issues of electrode dissolution,dendrite formation,and corrosion in traditional liquid electrolytes have plagued its progress.In this work,Zn dendrite growth and side reactions are effectively suppressed by a highly-confined tannic acid(TA)modified sodium alginate(SA)composite gel electrolyte(TA-SA).The ion-confinement effect is enhanced by divalent zinc ions coordinated with carboxyl groups and chelated with phenolic hydroxyl groups,thus guiding and regulating Zn deposition to achieve steady zinc plating/stripping behavior.As a consequence,the Zn/TA-SA/NH_(4)V_(4)O_(10) full cells deliver a high specific capacity of 238.6 mAh g^(-1) and maintain 94.51%over 900 cycles at 2 A g^(-1).Notably,after resting over 5 d,the capacity can be stabilized with a capacity retention of 97.25%after 200 cycles at 2 A g^(-1).This highlyconfined and hydrogen bond-strengthened gel electrolyte may provide an effective strategy for the future development of quasi-solid-state metal batteries. 展开更多
关键词 Natural polymers Hydrogel electrolytes Cycling stability SELF-DISCHARGE Aqueous zinc-ion batteries
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“Water in salt/ionic liquid”electrolyte for 2.8 V aqueous lithium-ion capacitor 被引量:8
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作者 Qingyun Dou Yue Wang +7 位作者 Aiping Wang Meng Ye Ruilin Hou Yulan Lu Lijun Su Siqi Shi Hongzhang Zhang Xingbin Yan 《Science Bulletin》 SCIE EI CAS CSCD 2020年第21期1812-1822,M0004,共12页
Development of high-voltage electrolytes with non-flammability is significantly important for future energy storage devices.Aqueous electrolytes are inherently non-flammable,easy to handle,and their electrochemical st... Development of high-voltage electrolytes with non-flammability is significantly important for future energy storage devices.Aqueous electrolytes are inherently non-flammable,easy to handle,and their electrochemical stability windows(ESWs)can be considerably expanded by increasing electrolyte concentrations.However,further breakthroughs of their ESWs encounter bottlenecks because of the limited salt solubility,leading to that most of the high-energy anode materials can hardly function reversibly in aqueous electrolytes.Here,by introducing a non-flammable ionic liquid as co-solvent in a lithium salt/water system,we develop a"water in salt/ionic liquid"(WiSIL)electrolyte with extremely low water content.In such WiSIL electrolyte,commercial niobium pentoxide(Nb2O5)material can operate at a low potential(-1.6 V versus Ag/AgCl)and contribute its full capacity.Consequently,the resultant Nb2O5-based aqueous lithium-ion capacitor is able to operate at a high voltage of 2.8 V along with long cycling stability over 3000 cycles,and displays comparable energy and power performance(51.9 Wh kg^-1 at 0.37 kW kg^-1 and 16.4 Wh kg^-1 at 4.9 kW kg^-1)to those using non-aqueous electrolytes but with improved safety performance and manufacturing efficiency. 展开更多
关键词 Lithium-ion capacitor Aqueous electrolyte Niobium pentoxide Electrochemical stability window
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Li_(2)CO_(3)induced stable SEI formation:An efficient strategy to boost reversibility and cyclability of Li storage in SnO_(2)anodes 被引量:2
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作者 Gang Wen Liang Tan +5 位作者 Xuexia Lan Hanyin Zhang Renzong Hu Bin Yuan Jun Liu Min Zhu 《Science China Materials》 SCIE EI CAS CSCD 2021年第11期2683-2696,共14页
The unstable interfaces between a SnO_(2)anode and an electrolyte in a Li-ion battery dramatically impair the reversibility and cycling stability of lithiation and delithiation,resulting in low roundtrip Coulombic eff... The unstable interfaces between a SnO_(2)anode and an electrolyte in a Li-ion battery dramatically impair the reversibility and cycling stability of lithiation and delithiation,resulting in low roundtrip Coulombic efficiency(CE)and fast capacity decay of SnO_(2)-based anode materials.Herein,a simple strategy of modifying the solid electrolyte interphase(SEI)is developed to enhance the interfacial stability and lithium storage reversibility of SnO_(2)by compositing it with graphite(G)and an inorganic component of the SEI,such as Li_(2)CO_(3)or LiF,which results in the SnO_(2)-Li_(2)CO_(3)/G and SnO_(2)-LiF/G composite anodes with high CEs,large capacities and long cycle lives.Specifically,the SnO_(2)-Li_(2)CO_(3)/G composite anode exhibits an average initial CE of 79.6%,a stable reversible capacity of 927.5 mA hg^(-1)at a current rate of 0.2 A g^(-1),and a charge capacity over 1200 mA hg^(-1)with a CE>99%after 900 cycles at a higher current rate of 1 A g^(-1).It is revealed that Li_(2)CO_(3)induces the formation of a dense and stable SEI on SnO_(2)grains and inhibits the coarsening of nanosized Sn particles generated from the dealloying reaction in the SnO_(2)-Li_(2)CO_(3)/G electrode.Moreover,the CE and cycling stability of other alloying-type(Si)and conversion reaction(MnO_(2)and Fe_(3)O_(4))anodes can also be greatly promoted by simply milling with Li_(2)CO_(3).Thus,a universal and simple strategy is developed to achieve highly reversible and stable electrodes for large-capacity lithium storage. 展开更多
关键词 tin oxide lithium carbonate solid electrolyte interphase lithium-ion battery Coulombic efficiency
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Analytical Study of Pair Production Rate from Vacuum in an Elliptic Polarized Field by a Two-Level Transition Technique 被引量:1
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作者 Mohamedsedik Melike XIE Bai-Song Dulat Sayipjama 《Communications in Theoretical Physics》 SCIE CAS CSCD 2012年第3期422-426,共5页
Electron-positron pair production rate created from vacuum in the presence of an elliptically polarized laser field is investigated.By applying the technique of two level transition amplitude,a routine for obtaining p... Electron-positron pair production rate created from vacuum in the presence of an elliptically polarized laser field is investigated.By applying the technique of two level transition amplitude,a routine for obtaining pair production rate is presented,and approximate analytical expressions are given both for the low frequency strong field regime and the high frequency weak field regime.We found that for an elliptically polarized field,the electron-positron pair production rate decrease when the elliptic eccentricity increase in the high frequency weak field regime,however,in the low frequency strong field regime,there is almost the same electron-positron pair production rate as in the constant electric field case. 展开更多
关键词 electron-positron pair production rate elliptically polarized field two-level transition rate
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Artificial solid-electrolyte interface facilitating uniform Zn deposition by promoting chemical adsorption
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作者 Jingjing Zhang Wei Peng +3 位作者 Junhong Jin Shenglin Yang Aishui Yu Guang Li 《Science China Materials》 SCIE EI CAS CSCD 2022年第3期663-674,共12页
Zn-air batteries are promising energy storage and conversion systems to replace the conventional lithiumbased ones.However,their applications have been greatly hindered by the formation of Zn dendrites and ZnO passiva... Zn-air batteries are promising energy storage and conversion systems to replace the conventional lithiumbased ones.However,their applications have been greatly hindered by the formation of Zn dendrites and ZnO passivation layer on the Zn anodes.Herein,we report the fabrication of an artificial protective layer comprised of N-doped threedimensional hollow porous multi-nanochannel carbon fiber with well-dispersed TiO_(2) nanoparticles(HMCNF).The incorporated TiO;nanoparticles and N dopants improve the ion flux distribution and promote the surface adsorption,facilitating the interfacial pseudocapacitive behaviors during Zn deposition.The hierarchical architecture also induces homogenous electric field distribution at the anode/electrolyte interface.Accordingly,the deposition behavior of Zn is regulated,giving rise to enhanced utilization and rechargeability of Zn.When integrated in alkaline Zn-air batteries,the HMCNF-coated Zn anodes exhibit improved electrochemical performances relative to those with the bare Zn anodes,demonstrating a versatile strategy to boost energy storage of metal anodes through optimizing surface adsorption properties. 展开更多
关键词 regulated Zn deposition Zn adsorption artificial solid-electrolyte interface Zn anode Zn-air battery
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