磷酸铁锂电池高温循环性能影响研究

Studying on the Cycling Performance of LiFePO_4 Li-ion Battery at High Temperature

将Li Fe PO4/C锂离子电池分别在25℃（常温）、45℃、55℃下进行0%~100%DOD、1.0 C充/1.0 C放循环测试。结果显示,随温度的升高,电池的循环性能越差。本试验分别比较了电解液、负极材料对不同温度循环性能的影响。电解液中添加高沸点溶剂和抑制Li PF6分解的添加剂、负极使用小粒径中间相碳微球能够提高电池的高温循环性能。

During at 0~100 DOD %, LiFePO_4-C lithium-ion battery was tested at 25 ℃（normal temperatuer）, 45 ℃, 55 ℃, 1.0 C charged and 1.0 C discharged. The result showed that with the increase of temperature, the cycle capacity attenuation was more obvious. In this experiment, the effects of electrolyte and anode materials on the performance of different temperature cycles were compared. Electrolyte added high boiling point solvent and inhibit decomposition of LiPF_6 additive. And using small diameter MCMB can improve the battery＇s cycle-life at high-temperature.