Structure characterization and electrochemical properties ofnew lithium salt LiODFB for electrolyte of lithium ion batteries
来源期刊：中南大学学报(英文版)2008年第6期
论文作者：高宏权 张治安 赖延清 李劼 刘业翔
文章页码：830 - 830
Key words：lithium ion battery; electrolyte; lithium difluoro(axalato)borate; synthesis; electrochemical properties
Abstract: Lithium difluoro(axalato)borate (LiODFB) was synthesized in dimethyl carbonate (DMC) solvent and purified by the method of solventing-out crystallization. The structure characterization of the purified LiODFB was performed by Fourier transform infrared (FTIR) spectrometry and nuclear magnetic resonance (NMR) spectrometry. The electrochemical properties of the cells using 1 mol/L LiPF6 and 1 mol/L LiODFB in ethylene carbonate (EC)/DMC were investigated, respectively. The results indicate that LiODFB can be reduced at about 1.5 V and form a robust protective solid electrolyte interface (SEI) film on the graphite surface in the first cycle. The graphite/LiNi1/3Mn1/3Co1/3O2 cells with LiODFB-based electrolyte have very good capacity retention at 55 ℃, and show very good rate capability at 0.5C and 1C charge/discharge rate. Therefore, as a new salt, LiODFB is a most promising alternative lithium salt to replace LiPF6 for lithium ion battery electrolytes in the future.
基金信息：the National Key Technology Research and Development Program of China
the National Natural Science Foundation of China
