阻燃剂对5Ah锂离子软包电池倍率性能和安全性能的影响研究

Effects of Flame Retardant on the Rate Capability and Safety Performances of the Soft-Package 5Ah Lithium Ion Battery

在电解液中加入不同含量(5%,10%,20%)的阻燃剂,研究其对LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2三元材料作为正极材料组装的5 Ah锂离子软包电池的倍率性能、过充性能和短路性能的影响.实验结果表明,电解液中5%体积含量的阻燃剂使软包电池在1C和2C放电时,具有最好的倍率性能;当阻燃剂的体积含量提升到20%,在过充时,电池表面温度升高最少;在短路实验时,电池不起火、不爆炸.

The 5 Ah soft packed lithium ion batteries with LiNi0.4Co0.2Mn0.4O2 as the positive electrode material and the organic electrolytes with different amounts of fire retardants as the electrolyte solution were prepared.The effects of the fire retardant amount（5 %,10 %,20 %） of the fire retardants on the rate performances,short-circuit characteristics and overcharged behaviors of the 5 Ah soft packed lithium ion battery were investigated by electrochemical methods.The results indicated that the best rate performances were obtained by adding 5 vol.% of the fire retardants in the electrolyte solution when the battery was discharged at 1C and 2C.The battery had the lowest surface temperature with 20 vol.% of fire retardant in the electrolyte solution when it was over-charged.The batteries could not catch fire and explode when the battery were short-circuited.