关键词: 锂离子软包电池, 阻燃剂, 安全性能, 倍率性能, 过充

Abstract:

The 5 Ah soft packed lithium ion batteries with LiNi _0.4Co_0.2Mn_0.4 O₂ 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.

Key words: soft-packaged lithium ion battery, fire retardant, safety performances, rate performances, over-charge.