含硼化合物在锂离子电池电解质中的应用

Application of boron compounds to electrolyte of Li-ion battery

介绍了含硼化合物在二次锂离子电池电解质中的应用。B2 O3 和烷基或烷氧基硼氧烷作添加剂加入到电解质中 ,可减少电池在循环中放电容量的衰减 ,提高电池的循环寿命 ,但同时也增加了电池在初次充放电时不可逆容量的损失。某些含硼氧环的化合物加入到聚合物电解质中 ,能提高电解质中锂离子的迁移数及减少电极表面的电阻。硼酸酯的熔点低、沸点高 ,以它作溶剂 ,能提高电解质的高低温性能及电化学稳定性。以含有较大阴离子的有机锂盐作溶质 ,可提高电解质的电化学窗口和电导率。

The application of some boron compounds to Liion batteries as solvents,solutes and additives in electrolyte was introducedThe electrolytes which contained B2O3 or compound with a (BO)3 ring could reduce the loss of capacity during cycling and improve the cycliability of Li ion batteries,but also increased the irreversible capacity loss during the first cycleIn polymer electrolytes,the addition of compounds containing (BO)3 ring could improve Li+ transference number and reduce resistance between electrode and electrolyteBorates which had low melt point and high boiling point could improve battery performance under low and high temperaturesAs solutes,lithium organoborates with a big anion could improve the electrochemical window and conductivity of electrolyte