【摘要】 为了进一步改进锂离子蓄电池的安全性能,研究了在液体电解质中添加环己烷苯(Cyclohexylbenzene,简称CHB)的过充保护作用。对电池进行了恒流充放电和过充实验、循环伏安扫描测试和容量特性测试。实验数据显示,在1mol稝L-1LiPF6/EC+DEC+DMC(体积比1∶1∶1)中添加CHB2.5%和5%(质量分数)时,当外加电压在4.3～5.0V范围内,CHB生成了导电聚合物膜,使正在充电的电池内部形成短路而发生自放电,可把电池电压控制在4.5～4.8V,从而处于更安全的充电状态。在该体系正常充放电过程中,添加CHB对电池容量特性没有不利影响。所以CHB是锂离子蓄电池优良的过充保护添加剂。更多还原

【Abstract】 In order to further improve the safety performance of lithium ion batteries,cyclohexylbenzene(CHB)was investigated to be an overcharge protection additive for non-aqueous liquid electrolyte in lithium ion batteries.Proved by overcharge of batteries,cyclic voltammetry tests and battery power capacity measurements in this research,certain conclusions were obtained.When the external potential ranges from 4.3 V to 5 V,CHB(2.5% or 5% by mass)in the system of electrolyte 1 mol·L-1LiPF6/EC+DEC+DMC(1∶1∶1 by volume)can produce the conductive polymer film,creating the short-circuit between the positive and negative electrodes and causing self-discharge.Therefore the cell’s potential can be controlled between 4.5-4.8 V,and the lithium ion batteries can be much safer when overcharged.Meanwhile,during the normal charge-discharge process of the battery system,the addition of the proper weight percentage of CHB does not have negative effect on the capacity character of lithium-ion battery.All these advantages promise CHB to be an ideal overcharge protection additive in lithium ion batteries.更多还原