可用于锂离子电池的新型锂盐:LiODFB

介绍一种新型的可用于锂离子电池的锂盐:LiODFB(lithium oxalyldifluoroborate).LiODFB独特的化学结构,使其结合了双乙二酸硼酸锂(LiBOB)及四氟硼酸锂(LiBF4)的优势.与LiBOB相比,LiODFB在碳酸酯中的溶解性和溶剂的黏度有了明显改善,从而使锂离子电池具有更好的低温性能和倍率放电性能.而与LiBF4相比,LiODFB能促进稳定固态电解液界面(solid electrolyte interface,SEI)的形成,改善了锂离子电池的高温性能.该种新型锂盐还具有以下优点:与金属锂的化学稳定性好,在高电位下能够很好地使铝箔得到钝化和提高锂离子电池安全性能及抗过充的能力.这些性能使得LiODFB成为一种极有可能替代LiPF6的新型锂盐.

LiODFB: A unique lithium salt for lithium ion battery

We introduced a latest developed lithium salt,lithium oxalyldifluoroborate as a candidate for lithium ion batteries.The research indicated that due to its unique chemical structure,LiODFB combined advantages of Lithium bis(oxalato)borate(LiBOB) and LiBF4.Compared with LiBOB,an apparent improvement has been shown that the salt was more soluble in carbonates and the solutions so-formed were less viscous,which made lithium ion batteries with better low temperature and high rate performance.And compared with LiBF4,LiODFB was capable to facilitate the formation of stable solid electrolyte interface on the surface of metallic lithium or graphite anode,which enables lithium ion batteries to be operated at high temperature properly.This brand new type lithium salt also has other merits,including the chemical compatibility with metallic lithium,the ability to passivate aluminum foil at high potentials and the capability to increase lithium ion batteries safety and overcharge tolerance.These properties make LiODFB a potential substitute for LiPF6.