物理化学学报 >> 2001, Vol. 17 >> Issue (06): 526-530.doi: 10.3866/PKU.WHXB20010611

研究论文 上一篇    下一篇

锂离子固相扩散控制下的材料放电过程

唐致远;薛建军;李建刚;王占良   

  1. 天津大学化工学院,天津 300072
  • 收稿日期:2000-12-11 修回日期:2001-02-22 发布日期:2001-06-15
  • 通讯作者: 唐致远 E-mail:zytang@public.tpt.tj.cn

Discharge Process of Insertion Electrodes Controlled by Lithium Ion Diffusion in Solid Materials

Tang Zhi-Yuan;Xue Jian-Jun;Li Jian-Gang;Wang Zhan-Liang   

  1. School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072
  • Received:2000-12-11 Revised:2001-02-22 Published:2001-06-15
  • Contact: Tang Zhi-Yuan E-mail:zytang@public.tpt.tj.cn

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LiMn2O4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.

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

Abstract: 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 Q(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.

Key words: Solid diffusion, Lithium ion battery, Insertion electrode, Discharge capacity, Lithium manganese oxide(LiMn2O4),  Graphite