V_2O_5(TiO_2)/S复合材料作锂电池正极的性能研究  

Study on property of V_2O_5/S,TiO_2/S composite materials as cathode for lithium ion batteries

作　　者：马萍[1] 张宝宏[1] 巩桂英[1] 徐宇虹[1] 

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,黑龙江哈尔滨150001

出　　处：《电子元件与材料》2007年第8期42-45,共4页Electronic Components And Materials

基　　金：哈尔滨工程大学基础研究基金资助项目(HEUF04064)

摘　　要：为了改善锂硫电池的循环性能,将单质硫分别与纳米金属氧化物(V2O5,TiO2)机械混合。用XRD对材料的晶体结构进行了表征。通过循环伏安、交流阻抗和电池性能的对比,对材料的电化学性能进行了分析。结果表明:采用V2O5改性的硫材料,首次放电比容量达844.68 mAh.g–1,样品循环容量衰减明显改善,30次后比容量保持在696.71 mAh.g–1。而TiO2/S复合材料,初始放电比容量为578.21 mAh.g–1,30次循环后比容量为347.71 mAh.g–1。In order to improve the cyclic performance of lithium-sulphur battery, conductive sulphur-containing cathode materials were synthesized by mechanical milling, using a mixture of metal oxides （V205, TiO2） and elemental sulphur. The structure of the prepared cathode material was characterized by XRD. The electrochemical performance of sulphur composite electrodes was investigated by galvanostatic charge/discharge, cycling voltammetry methods and AC impedance. Combined with gel polymer electrolyte, the V205/S composites exhibit high specific capacity up to 844.68 mAh · g^-1 in the initial cycle and a stable reversible capacity approximately 696.71 mAh · g^-1 after 30 cycle numbers. The discharge specific capacity of TiO2/S is 578.21 mAh · g^-1 in the first cycle and 347.71 mAh · g^-1 after 30 cycle numbers.

关 键 词：复合材料 单质硫 五氧化二钒 二氧化钛 锂离子电池 

分 类 号：TM912.2[电气工程—电力电子与电力传动]