(1. 湖南大學(xué) 化學(xué)化工學(xué)院，長沙 410082；2. 深圳市雄韜電源科技股份有限公司，深圳 518120)
摘 要: 研究用LiCoO2-LiFePO4作正極的鋰離子電池的電化學(xué)性能和安全性能。結(jié)果表明：電池在1、3和5C倍率的放電容量分別為347.7、327.2和322.5 mA·h，5C條件下的放電容量為1C放電容量的92.8%。在25 ℃、1C條件下循環(huán)150次的容量保持率為100%；在−10 ℃、1C條件下的放電容量為256.5 mA·h，是25 ℃、1C放電容量的74.8%。電池具有很好的耐過充性能，在3C、10 V條件下進行過充電，電池不漏液、起火或爆炸。短路時電池的表面溫度低于LiCoO2電池的表面溫度。
關(guān)鍵字: 鋰離子電池；LiCoO2；LiFePO4；電池性能
lithium ion batteries
（1. College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China;
2. Shenzhen Center Power Technology Co., Ltd., Shenzhen 518120, China）
Abstract: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 mA·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.
Key words: lithium-ion battery; LiCoO2; LiFePO4; battery performance
