摘要
从理论上分析了在锂离子固相扩散控制条件下 ,电极材料的恒流放电过程 .数值计算的结果表明 ,Q值(放电时率和扩散时间常数之比)对材料的放电容量有非常重要的影响 .模拟了 LiMN_2O4正极材料和石墨负极材料的恒流放电曲线 ,分析了颗粒粒径对这两种材料放电容量的影响 .
We have analyzed the galvanostatic discharge process of insertion electrodes controlled by lithium ion diffusion in solid materials. It is demonstrated by mathematic calculation that the discharge capacity of insertion electrode depends on the value of e(defined as the ratio of discharge hour rate and diffusion time constant). The galvanostatic discharge curve of spinel LiMn2O4 cathode and graphite anode have been simulated. The effect of particle size on the discharge capacity of spinel LiMn2O4 cathode and graphite anode is evaluated.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2001年第6期526-530,共5页
Acta Physico-Chimica Sinica
基金
天津市自然科学基金资助项目(990346)
关键词
固相扩散
锂离子电池
嵌入电极
放电容量
锰酸锂
石墨
锂离子
恒流放电
solid diffusion
lithium ion battery
insertion electrode
discharge capacity
lithium manganese oxide(LiMn2O4)
graphite