Abstract: 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. 

Key words: lithium bis(oxalato)borate (LiBOB), lithium-ion batteries, oxalic acid, lithium hydroxide, boric acid