Electrochemical characteristics of LiFePO4/LiCoO2 mixed electrode for Li secondary battery

被引:12
作者
Kim, Hyun-Soo [1 ]
Kong, Mingzhe
Kim, Ketack
Kim, Ick-Jun
Gu, Hal-Bon [2 ]
机构
[1] Korea Electrotechnol Res Inst, Battery Res Grp, Chang Won 641120, South Korea
[2] Chonnam Natl Univ, Kwangju 500757, South Korea
关键词
LiFePO4/LiCoO2; Cathode material; Rate-capability; Capacity retention; Thermal stability; CATHODE MATERIAL; LITHIUM; PERFORMANCE; LICOO2;
D O I
10.1007/s10832-007-9403-0
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
LiFePO4 cathode active material was synthesized using a solid state method and a mixed cathode was prepared by adding LiCoO2. A coin cell was prepared using the mixed cathode and its electrochemical performances were evaluated. The LiFePO4 material improved both in thermal stability and rate capability. The discharge capacity of the 5 wt.% LiCoO2-added LiFePO4 material was 139.4 mAh/g at 0.2 C rate, and it showed a capacity retention of 64.2% even at 5 C rate in comparison to 0.2 C rate. The cycle performance of the bare LiFePO4 material was excellent, but the capacity fading of 20 wt.% LiCoO2-added LiFePO4 material became significant during charge/discharge cycle. However, 5 similar to 10 wt.% LiCoO2-added LiFePO4 material showed good thermal stability, high rate capability and good cycle performances.
引用
收藏
页码:219 / 224
页数:6
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