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Improved stability of highly concentrated LiBF4/fluorinated ethyl acetate-based electrolyte solutions with a co-solvent for LiNi0.8Co0.1Mn0.1O2 positive electrodes in lithium ion batteries

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Abstract

A nearly saturated 2,2,2-trifluoroethyl acetate (FEA)-based electrolyte solution has a low viscosity and delivers superior charge/discharge performance for LiNi0.8Co0.1Mn0.1O2 (NCM811) positive electrodes for lithium ion batteries. However, FEA has a low flash point, and hence needs to be mixed with an appropriate co-solvent to improve the safety of electrolyte solutions. In this study, two kinds of co-solvent were introduced into LiBF4/FEA electrolyte solutions and the LiBF4 concentration was increased. The mixture ratio of FEA and a co-solvent had a major effect on the charge/discharge performance of NCM811. The resultant nearly saturated electrolyte solution further improved the charge/discharge properties in terms of both cycle- and high rate performance. A very thin protective layer formed on NCM811 to suppress continual decomposition of the electrolyte solution, and did not interfere with interfacial Li+ transfer between the NCM811 electrode and electrolyte solution. In addition, 2,2-difluoroethyl acetate, which has a higher flash point than FEA, was used as a main solvent to study the highly concentrated electrolyte solutions.

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Acknowledgements

The authors thank Mr. Takeshi Yoshida, Mr. Shingo Takahashi, and Mr. Norihisa Kimura at Kanto Denka Kogyo Co., Ltd. for providing samples and their helpful discussion. This research was partially supported by “Advanced research program for energy and environmental technologies” from New Energy and Industrial Technology Development Organization (NEDO), Japan.

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  1. Department of Molecular Chemistry and Biochemistry, Doshisha University, Kyotanabe, Kyoto, 610-0321, Japan

    Takayuki Doi, Ryo Fujii & Minoru Inaba

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  1. Takayuki Doi
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  2. Ryo Fujii
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  3. Minoru Inaba
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Correspondence to Takayuki Doi.

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Doi, T., Fujii, R. & Inaba, M. Improved stability of highly concentrated LiBF4/fluorinated ethyl acetate-based electrolyte solutions with a co-solvent for LiNi0.8Co0.1Mn0.1O2 positive electrodes in lithium ion batteries. J Appl Electrochem 51, 1535–1544 (2021). https://doi.org/10.1007/s10800-021-01590-w

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