摘要
采用二次缩合溶胶-凝胶法制备锂离子电池正极材料Li1+xV3O8,首次放电容量达330 mA.h/g,循环15次后容量衰减7.6%。测试不同温度下放电时正极材料Li1+xV3O8中Li+的扩散系数DLi+;从动力学角度研究了温度放电倍率密度对电池性能的影响。结果表明,随着温度的增加,DLi+增大,比容量相应增大;当以0.02 C的放电倍率放电时,电容量较高,以0.08 C的放电倍率放电时,电容量衰减约50%。
The cathode material for lithium-ion batteries was prepared by the sol-gel method. The first discharge specific capacity was 330 mA·h/g and it decreased by 7. 6% after 15 cycles. The chemical diffusion coefficient of lithium-ion in Li1＋xV3O8 cathode material was tested at different temperatures. The effect of temperature and current density on electrochemical performance was analyzed from the point of view of kinetics. The results show that the chemical diffusion coefficient of lithium-ion increases with an increase in temperature, which causes the discharge specific capacity to increase. When the cathode material discharges at a rate of 0.02 C, the capacity is higher, but the capacity decreases by 50% approximately when at a rate of 0. 08 C.
出处
《合肥工业大学学报（自然科学版）》
CAS
CSCD
北大核心
2007年第8期984-987,共4页
Journal of Hefei University of Technology：Natural Science
基金
安徽省教育厅自然科学基金资助项目(050601D2)
作者简介
李枝贤 （1982-）, 男,四川通江人,合肥工业大学硕士生;
鲁道荣 （1953-）, 女, 安徽和县人,合肥工业大学教授,硕士生导师.
