Superior capacity retention spinel oxyfluoride cathodes for lithium-ion batteries

被引：48

作者：

Choi, W ^{[1
]}

Manthiram, A ^{[1
]}

机构：

[1] Univ Texas, Mat Sci & Engn Program, Austin, TX 78712 USA

来源：

ELECTROCHEMICAL AND SOLID STATE LETTERS | 2006年 / 9卷 / 05期

关键词：

D O I：

10.1149/1.2186022

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Spinel LiMn2-y-zLiyMzO4-eta F eta (M = Ti, Ni, and Cu) oxyfluoride cathodes have been synthesized by firing the cation-substituted LiMn2-y-zLiyMzO4 oxides with NH4HF2 at a moderate temperature of 450 degrees C. With this low-temperature approach, fluorine contents up to eta = 0.21 could be incorporated into the spinel lattice. The oxyfluoride compositions such as LiMn1.8Li0.1Ni0.1O3.8F0.21 exhibit excellent capacity retention at 60 degrees C with capacities over 100 mAh/g and good rate capability. The superior electrochemical performance is found to be due to a smaller lattice parameter difference between the two cubic phases formed during the charge-discharge process and the consequent suppressed manganese dissolution. (c) 2006 The Electrochemical Society.

引用

页码：A245 / A248

页数：4

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