锂离子电池耐过充添加剂的研究

Study on overcharging additives of Li-ion battery

环己基苯和二甲苯作为耐过充添加剂加入锂离子电池电解液中。环己基苯和二甲苯分别在4.70 V、4.66 V(vs.Li/Li+)处发生电聚合反应。聚合物几乎全部覆盖在隔膜表面,阻断了反应,改善了电池的安全性。添加5%添加剂的电池,均可耐3C1、0 V过充电,且对电池正常充放电时的电化学性能影响很小。

Cyclohexyl benzene（CB） and xylene as overcharging additives were added into Li-ion battery electrolyte. CB and xylene could be electrochemically polymerized at 4.70 V and 4.66 V （ vs. Li/Li^＋ ）, respectively. The polymer mainly deposited on the separator, restrained the reaction and improved the safety performance of the battery. The batteries with the additives could resist overcharge of 3 C, 10 V when the content of additive was 5% .There was only a slight influence on the electrochemical performance of the batteries with normal charge-discharge.