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二硫化钨纳米片的制备及其在锂(钠)离子电池中的研究现状 被引量:4
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作者 吴鹏飞 岳红彦 +5 位作者 关恩昊 高鑫 宋姗姗 张宏杰 张腾 郭欣睿 《现代化工》 CAS CSCD 北大核心 2018年第10期27-30,共4页
综述了WS2纳米片阵列的主要制备方法,包括液相剥离法、锂离子插层剥离、化学气相沉积法、水热法,及其在锂(钠)离子电池中的应用情况,并对其应用前景进行了展望。
关键词 二硫化钨纳米片阵列 二维纳米材料 ()离子电池
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Hydrogen reduced sodium vanadate nanowire arrays as electrode material of lithium-ion battery 被引量:2
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作者 XU Xue-liu LI Guang-zhong +7 位作者 FU Ze-wei HU Jun-tao LUO Zhi-ping HUA Kang LU Xue-qin FANG Dong BAO Rui YI Jian-hong 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第6期1540-1549,共10页
Vanadates and vanadium oxides are potential lithium-ion electrode materials because of their easy preparation and high capacity properties.This paper reports the electrochemical lithium-storage performance of VO2 and ... Vanadates and vanadium oxides are potential lithium-ion electrode materials because of their easy preparation and high capacity properties.This paper reports the electrochemical lithium-storage performance of VO2 and NaV2O5 composite nanowire arrays.Firstly,Na5V12O32 nanowire arrays are fabricated by a hydrothermal method,and then VO2 and NaV2O5 composite nanowire arrays are prepared by a reduction reaction of Na5V12O32 nanowire arrays in hydrogen atmosphere.Crystal structure,chemical composition and morphology of the prepared samples are characterized in detail.The obtained composite is used as an electrode of a lithium-ion battery,which exhibits high reversible capacity and good cycle stability.The composite obtained at 500℃presents a specific discharge capacity up to 345.1 mA·h/g after 50 cycles at a current density of 30 mA/g. 展开更多
关键词 sodium vanadate hydrogen reduction nanowire array lithium-ion battery
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Na2FePO4F/C composite synthesized via a simple solid state route for lithium-ion batteries 被引量:3
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作者 HU Hai WANG Yu +2 位作者 HUANG Yan SHU Hong-bo WANG Xian-you 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第6期1521-1529,共9页
Using low-cost FePO4·2H2O as iron source,Na2FePO4F/C composite is prepared by alcohol-assisted ball milling and solid-state reaction method.The XRD pattern of Na2FePO4F/C composite demonstrates sharp peaks,indica... Using low-cost FePO4·2H2O as iron source,Na2FePO4F/C composite is prepared by alcohol-assisted ball milling and solid-state reaction method.The XRD pattern of Na2FePO4F/C composite demonstrates sharp peaks,indicating high crystalline and phase purity.The SEM and TEM images reveal that diameter of the spherical-like Na2FePO4F/C particles ranges from 50 to 300 nm,and HRTEM image shows that the surface of Na2FePO4F/C composite is uniformly coated by carbon layer with a average thickness of about 3.6 nm.The carbon coating constrains the growth of the particles and effectively reduces the agglomeration of nanoparticles.Using lithium metal as anode,the composite delivers a discharge capacities of 102.8,96.4 and 90.3 mA·h/g at rates of 0.5C,1C and 2C,respectively.After 100 cycles at 0.5C,a discharge capacity of 98.9 mA·h/g is maintained with capacity retention of 96.2%.The Li+diffusion coefficient(D)of Na2FePO4F/C composite is calculated as 1.71×10^–9 cm^2/s.This study reveals that the simple solid state reaction could be a practical and effective synthetic route for the industrial production of Na2FePO4F/C material. 展开更多
关键词 lithium-ion batteries Na2FePO4F/C composite alcohol-assisted ball milling solid state reaction spherical-like particles
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Enhancing sodium-ion storage performance of MoO/N-doped carbon through interfacial Mo–N–C bond 被引量:1
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作者 Bin Huang Shuang Liu +7 位作者 Xu Zhao Yanwei Li Jianwen Yang Quanqi Chen Shunhua Xiao Wenhua Zhang Hong-En Wang Guozhong Cao 《Science China Materials》 SCIE EI CSCD 2021年第1期85-95,共11页
Na-ion batteries(SIBs)have attracted considerable attention as promising alternatives to commercial Li-ion batteries(LIBs)due to comparable redox potential,and natural abundance of Na.However,it remains challenging to... Na-ion batteries(SIBs)have attracted considerable attention as promising alternatives to commercial Li-ion batteries(LIBs)due to comparable redox potential,and natural abundance of Na.However,it remains challenging to explore suitable anodes for SIBs.Herein,a MoO2/N-doped carbon(MoO2/N-C)composite composed of MoO2 nanocrystals embedded within carbon matrix with a Mo–N–C chemical bond is prepared by a simple yet effective carbonization-induced topochemical transformation route.Na-ion half-cells using MoO2/N-C exhibit excellent cycling stability over 5000 cycles at 5 A g^-1 and superior rate capability.Physicochemical characterizations and first-principles density functional theory(DFT)simulations reveal that the formation of chemical bond at the interface between MoO2 and N-doped carbon plays an important role in the excellent charge storage properties of MoO2/N-C.More importantly,the interfacial coupling can efficiently promote interface charge transfer.Benefiting from this,Na-ion capacitors(SICs)constructed with the MoO2/N-C anode and activated carbon cathode can deliver an impressive energy density of 15 W h kg^-1 at a power density of 1760 W kg^-1,together with a capacitance retention of 92.4%over 1000 cycles at 10 A g^-1.The proposed strategy in this paper based on interfacial chemical bond may hold promises for the design of high-performance electrodes for energy storage devices. 展开更多
关键词 topochemical transformation Mo–N chemical bond Na-ion batteries Na-ion capacitor density functional theory simulations
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Nano-structured red phosphorus/porous carbon as a superior anode for lithium and sodium-ion batteries 被引量:2
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作者 徐江 丁建宁 +3 位作者 朱文俊 周小双 葛善海 袁宁一 《Science China Materials》 SCIE EI CSCD 2018年第3期371-381,共11页
To enhance electrochemical performance of li- thium or sodium-ion batteries (LIBs or NIBs), active materials are usually filled in porous conductive particles to produce anode composites. However, it is still challe... To enhance electrochemical performance of li- thium or sodium-ion batteries (LIBs or NIBs), active materials are usually filled in porous conductive particles to produce anode composites. However, it is still challenging to achieve high performance anode composites with high specific capa- city, excellent rate performance, high initial Coulombic effi- ciency (ICE) and long cycle life. Based on these requirements, we design and fabricate activated carbon-coated carbon na- notubes (AC@CNT) with hierarchical structures containing micro- and meso-pores. A new structure of phosphorus/car- bon composite (P@AC@CNT) is prepared by confining red P in porous carbon through a vaporization-condensation-con- version method. The micro-pores are filled with P, while the meso-pores remain unoccupied, and the pore openings on the particle surface are sealed by P. Due to the unique structure of P@AC@CNT, it displays a high specific capacity of 1674 mA h g-i at 0.2 C, ultrahigh ICE of 92.2%, excellent rate per- formance of 1116 mA h g-i at 6 C, and significantly enhanced cycle stability for LIBs. The application of P@AC@CNT in NIBs is further explored. This method for the fabrication of the special composites with improved electrochemical per- formance can be extended to other energy storage applica- tions. 展开更多
关键词 ion battery red phosphorus/porous carbon compo-site NANOSTRUCTURE electrochemical performance
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Electrospun MoO_2@NC nanofibers with excellent Li^+/Na^+ storage for dual applications
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作者 梁娇娇 高显 +3 位作者 郭景 陈昌淼 樊凯 马建民 《Science China Materials》 SCIE EI CSCD 2018年第1期30-38,共9页
MoO_2@N-doped C nanofibers(MoO_2@NC NFs)were synthesized by electrospinning with polyacrylonitrile as carbon source.The in situ formed MoO_2nanocrystals are completely embedded in the carbon nanofibers,which can not... MoO_2@N-doped C nanofibers(MoO_2@NC NFs)were synthesized by electrospinning with polyacrylonitrile as carbon source.The in situ formed MoO_2nanocrystals are completely embedded in the carbon nanofibers,which can not only accelerate ion transition,but also act as a buffer to avoid the mechanical degradation of active material due to the volume changes during charge/discharge cycling.When used as the anode material for both Li/Na-ion batteries,the as-synthesized MoO_2@NC NFs displayed excellent Li~+/Na~+storage properties.As the anode for Li-ion battery,the MoO_2@NC NFs display a high discharge capacity of 930 mA h g^(-1)at a current density of 200 mA g^(-1)for 100 cycles,and 720 mA h g^(-1)at a current density of 1 A g^(-1)for 600 cycles.Moreover,the discharge capacity of 350 mA h g^(-1)could be realized at a current density of 100 mA g^(-1)for 200 cycles for Na-ion battery. 展开更多
关键词 electrospinning MoO2 nanofibers Li-ion batteries Na-ion batteries
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Thiourea-based polyimide/RGO composite cathode:A comprehensive study of storage mechanism with alkali metal ions 被引量:2
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作者 Peixun Xiong Huimin Yin +4 位作者 Zifeng Chen Chen Zhao Jixing Yang Shuping Huang Yunhua Xu 《Science China Materials》 SCIE EI CSCD 2020年第10期1929-1938,共10页
Although organic electrode materials have merits of abundant resources,diverse structures and environmental friendliness,their performance for electrochemical energy storage is far insufficient.In this work,a thiourea... Although organic electrode materials have merits of abundant resources,diverse structures and environmental friendliness,their performance for electrochemical energy storage is far insufficient.In this work,a thiourea-based polyimide/reduced graphene oxide(PNTCSA/RGO)composite was synthesized via a condensation polymerization method.As a cathode material in lithium-ion batteries,excellent performance is demonstrated with high reversible capacity(144.2 mA h g^−1),high discharge voltage(∼2.5 V),and long cycling life(over 2000 cycles at 500 mA g^−1),which are comparable to those of other well documented in organic electrodes.Encouraging electrochemical performance is also demonstrated for sodium ion batteries(a cycling life of 800 cycles at 500 mA g^−1),while poor performance is delivered in potassium ion batteries.Theoretical studies reveal that the active sites are carbonyl groups for all alkali ions but one inserted alkali metal ion is shared by two carbonyl groups from the two neighbor units.More importantly,K ions have stronger interaction with S atoms than Li/Na ions,which may lead to poor structure reversibility and account for the poor cycling performance.Our findings provide a fundamental understanding of polyimide based polymer electrodes and help to design and develop high performance organic electrode materials for alkali metal ion batteries. 展开更多
关键词 electrochemical energy storage POLYIMIDE organic electrode material lithium/sodium/potassium-ion battery
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Novel layered K0.7Mn0.7Ni0.3O2 cathode material with enlarged diffusion channels for high energy density sodium-ion batteries 被引量:1
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作者 Jinghui Chen Zhitong Xiao +5 位作者 Jiashen Meng Jinzhi Sheng Yanan Xu Junjun Wang Chunhua Han Liqiang Mai 《Science China Materials》 SCIE EI CSCD 2020年第7期1163-1170,共8页
As promising,low-cost alternatives of lithiumion batteries for large-scale electric energy storage,sodiumion batteries(SIBs)have been studied by many researchers.However,the relatively large size of Na+leads to sluggi... As promising,low-cost alternatives of lithiumion batteries for large-scale electric energy storage,sodiumion batteries(SIBs)have been studied by many researchers.However,the relatively large size of Na+leads to sluggish diffusion kinetics and poor cycling stability in most cathode materials,restricting their further applications.In this work,we demonstrated a novel K+-intercalated Mn/Ni-based layered oxide material(K0.7Mn0.7Ni0.3O2,denoted as KMNO)with stabilized and enlarged diffusion channels for high energy density SIBs.A spontaneous ion exchange behavior in forming K0.1Na0.7Mn0.7Ni0.3O2between the KMNO electrode and the sodium ion electrolyte was clearly revealed by in situ X-ray diffraction and ex situ inductively coupled plasma analysis.The interlayer space varied from 6.90 to 5.76?,larger than that of Na0.7Mn0.7Ni0.3O2(5.63?).The enlarged ionic diffusion channels can effectively increase the ionic diffusion coefficient and simultaneously provide more K+storage sites in the product framework.As a proof-of-concept application,the SIBs with the as-prepared KMNO as a cathode display a high reversible discharge capacity(161.8 mA h g-1at0.1 A g-1),high energy density(459 W h kg-1)and superior rate capability of 71.1 mA h g-1at 5 A g-1.Our work demonstrates that the K+pre-intercalation strategy endows the layered metal oxides with excellent sodium storage performance,which provides new directions for the design of cathode materials for various batteries. 展开更多
关键词 K0.7Mn0.7Ni0.3O2 K^+pre-intercalation enlarged layered structure high energy density sodium-ion batteries
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