锂离子电池正极材料LiCoO2-LiFePO4的性能

摘要

The electrochemical properties and safety performance of the cathode materials made up of LiCoO2 and LiFePO4 for lithium ion batteries were investigated. The results show that the discharge capacities of the battery at 1, 3 and 5C are 347.7, 327.2 and 322.5 mA·h, respectively. And the discharge capacity at 5C is 92.8% of that of 1C. When cycling at 25 ℃ and 1C, the capacity retention rate is 100% after 150 cycles, and the discharge capacity of 256.5 rnA·h at -10 ℃ and 1C is 74.8% compared with that at 25 ℃and 1C. When the batteries are over charged at 10 V and 3C, there are no electrolyte leakage, fire and blast on the batteries, which shows an excellent resistance to overcharge voltage. The surface temperature of the batteries tested with short-circuit tester is lower than that of LiCoO2 batteries.%研究用LiCoO2-LiFePO4作正极的锂离子电池的电化学性能和安全性能.结果表明:电池在1、3和5C倍率的放电容量分别为347.7、327.2和322.5 mA·h,5C条件下的放电容量为1C放电容量的92.8％.在25℃、1C条件下循环150次的容量保持率为100％;在-10℃、1C条件下的放电容量为256.5 mA·h,是25℃、1C放电容量的74.8％.电池具有很好的耐过充性能,在3C,10 V条件下进行过充电,电池不漏液、起火或爆炸.短路时电池的表面温度低于LiCoO2电池的表面温度.