锂离子蓄电池LiMn2O4正极材料容量衰减机理分析

作为一种新型材料,锂离子蓄电池尖晶石LiMn2O4正极材料已经得到了广泛的应用,但容量衰减成为LiMn2O4商品化的主要障碍。从正极材料的溶解及相变化、电解液的分解、钝化膜的形成、过充电、集流体的腐蚀等方面介绍了影响LiMn2O4正极材料容量衰减的机理。提出了减少LiMn2O4正极材料容量衰减的几种方法,并对LiMn2O4正极材料的发展前景做出了展望。

Analysis of capacity fading mechanism for LiMn2O4 cathode materials in lithium ion batteries

As a kind of new-style material,spinel LiMn2O4 cathode materials have been applied to lithium ion battery widely,and capacity fading is an main obstacle to commercialize the lithium manganese oxide.The effect on capacity fading mechanism was introduced from cathode material dissolution and phase change,electrolyte decomposition,passive film formation,over charge,and corrosion of current collector.Several methods to reduce capacity fading were put forward,and the development foreground of LiMn2O4 cathode materials was viewed.