锂离子电池用双草酸硼酸锂的固相合成

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。

Solid phase synthesis of LiBOB for lithium batteries

Synthesis of a new type lithium salt electrolyte—lithium bis(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 amount-of-substance 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 lithium-ion batteries.