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Structure characterization and electrochemical properties of new lithium salt LiODFB for electrolyte of lithium ion batteries

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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 °C, 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.

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Authors and Affiliations

  1. School of Metallurgical Science and Engineering, Central South University, Changsha, 410083, China

    Hong-quan Gao  (高宏权), Zhi-an Zhang  (张治安), Yan-qing Lai  (赖延清), Jie Li  (李 劼) & Ye-xiang Liu  (刘业翔)

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  1. Hong-quan Gao  (高宏权)
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  2. Zhi-an Zhang  (张治安)
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  3. Yan-qing Lai  (赖延清)
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  4. Jie Li  (李 劼)
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  5. Ye-xiang Liu  (刘业翔)
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Corresponding author

Correspondence to Zhi-an Zhang  (张治安).

Additional information

Foundation item: Project(2007BAE12B01) supported by the National Key Technology Research and Development Program of China; Project(20803095) supported by the National Natural Science Foundation of China

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Gao, Hq., Zhang, Za., Lai, Yq. et al. Structure characterization and electrochemical properties of new lithium salt LiODFB for electrolyte of lithium ion batteries. J. Cent. South Univ. Technol. 15, 830–834 (2008). https://doi.org/10.1007/s11771-008-0153-1

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  • DOI: https://doi.org/10.1007/s11771-008-0153-1

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