一种新型锂电池双功能电解液添加剂的研究  

Research on a new bifunctional electrolyte additive for lithium-ion batteries

作　　者：张千玉[1] 姜冬冬[2] 李溪[1] 

机构地区：[1]复旦大学环境科学与工程系,上海200433 [2]深圳清华大学研究院,广东深圳518057

出　　处：《电源技术》2014年第8期1424-1426,共3页Chinese Journal of Power Sources

基　　金：国家自然科学基金资助项目(61171008)

摘　　要：通过循环伏安法、充放电实验、过充和可燃性实验、差示扫描量热法(DSC)测试分析对4-溴-2-氟苯甲醚(BFMB)用作锂离子电池电解液的新型双功能添加剂进行了研究。结果表明过充时BFMB在4.6 V发生电聚合反应生成聚合物膜,从而阻止了电压的升高。这种添加剂不仅可以降低电解液的可燃性,而且提高了锂离子电池的热稳定性。对锂离子电池的正常循环性能基本没有影响。因此,这种添加剂可以用作锂离子电池双功能电解液添加剂,达到过充保护和阻燃双重效果。4-bromo-2-fluoromethoxybenzene （BFMB） was used as a novel bi-functional electrolyte additive for lithium-ion batteries and studied by cyclic voltammetry,charge-discharge measurements,overcharge and flammability tests,differential scanning calorimetry （DSC） analysis.The results show that the additive can electrochemically polymerize at 4.6 V （vs.Li/Li＋） to form a polymer film,preventing the voltage rise when overcharging.The additive can lower the flammability of the electrolyte and enhance the thermal stability of the lithium-ion batteries.The additive does not influence the normal cycle performance of lithium-ion batteries.Thus,it is possible to be used as bi-functional electrolyte additive to provide overcharge protection and fire retardancy for lithium-ion batteries.

关 键 词：4-溴-2-氟苯甲醚 电解液添加剂 过充保护 阻燃剂 锂离子电池 

分 类 号：TM912.9[电气工程—电力电子与电力传动]