材料科学与工程学报2011，Vol.29Issue(6)：879-884,6.
溶胶机械活化及其溶剂对LiFePO4/C结构和电化学性能的影响
Effects of Mechanical Activation of Sol and Different Solvents on the Structure and Electrochemical Properties of LiFePO_4/C Cathode Materials
摘要
Abstract
Mechanical activation for the sol has been introduced in a sol-gel method to synthesize LiFePO4/C cathode materials used for lithium ion batteries in order to optimize the structure and morphology of LiFePO4/C.By means of the in situ introduction of the high electron conductivity Fe2P phase,the capability of the synthesized LiFePO4/C product has been effectively improved.The effects of the mechanical activation of the sol and different solvents on the structure and electrochemical properties of LiFePO4/C composites have been studied by using X-ray diffractometry（XRD）,scanning electron microscopy（SEM）,electrochemical impedance spectroscopy（EIS）,element analysis and electrochemical testing of galvanostatic charge-discharge etc.The results show that mechanical activation of sol plays an important role in reducing the particle size of LiFePO4 and the agglomeration,and hence,improves the high-rate capability.The amount of Fe2P formed has also been changed by the mechanical activation and the solvents.Compared with distilled water,solvent of ethanol leads to smaller LiFePO4 particles and possess better high-rate capacity and the corresponding LiFePO4/C achieves specific capacities of 136 and 90 mAh/g at the rates of 1C and 10C,respectively.关键词
锂离子电池/LiFePO4/C/溶胶凝胶法/机械活化/电化学性能Key words
lithium ion battery/LiFePO4/C/sol-gel method/mechanical activation/electrochemical property分类
信息技术与安全科学引用本文复制引用
叶欣,高明霞,殷月辉,刘永锋,潘洪革..溶胶机械活化及其溶剂对LiFePO4/C结构和电化学性能的影响[J].材料科学与工程学报,2011,29(6):879-884,6.基金项目
浙江省科技计划资助项目 （）
浙江省自然科学基金资助项目 （）
