锂离子电池用双草酸硼酸锂的固相合成

Solid phase synthesis of LiBOB for lithium batteries

详细介绍了固相法合成的一种新型电解质锂盐——双草酸硼酸锂(LiBOB)。制备过程采用草酸、氢氧化锂、硼酸为原料,其物质的量比为2.1∶1∶1,经球磨混合后高温烧制,烧制温度为120℃、脱水温度为240℃,所得产品经乙酸乙酯提纯后即得产物。产物通过分析测定可知,其杂质含量少且晶体结构完整;并通过热分析证实其热稳定性优于六氟磷酸锂。用其制备的电解液组装的电池,循环性能较好,所制双草酸硼酸锂达到用作电池电解质锂盐的标准。

Synthesis of a new type lithium salt electrolyte--lithium his （oxalato） borate （ LiBOB ） by solid phase method was introduced in detail. In preparation process, oxalic acid ,lithium hydroxide, and boric acid were used as raw materials, whose ratio was 2. 1： 1： 1. After mixed by ball milling, sintered at 120 ℃, and dehydrated at 240 ℃, LiBOB product could be obtained by purification with ethyl acetate. Analysis results showed the product had a complete crystal structure and a low content of impurities. Thermal analysis proved that its thermal stability was better than that of lithium hexafluorophosphate （ LiPF6 }. Battery assembled by LiBOB prepared electrolyte had a better cycle performance. Furthermore,the prepared LiBOB reached the standard of lithium salt electrolyte used for lithimn-ion batteries.