Reduction Reactions of Electrolyte Salts for Lithium Ion Batteries: LiPF6, LiBF4, LiDFOB, LiBOB, and LiTFSI

Authors

Bharathy S. Parimalam, University of Rhode Island
Brett L. Lucht, University of Rhode IslandFollow

Document Type

Article

Date of Original Version

1-19-2018

Department

Chemistry

Abstract

The reduction products of common lithium salts for lithium ion battery electrolytes, LiPF₆, LiBF₄, lithium bisoxalato borate (LiBOB), lithium difluorooxalato borate (LiDFOB), and lithium trifluorosulfonylimide (LiTFSI), have been investigated. The solution phase reduction of different lithium salts via reaction with the one electron reducing agent, lithium naphthalenide, results in near quantitative reactions. Analysis of the solution phase and head space gasses suggests that all of the reduction products are precipitated as insoluble solids. The solids obtained through reduction were analyzed with solution NMR, IR-ATR and XPS. All fluorine containing salts generate LiF upon reduction while all oxalate containing salts generate lithium oxalate. In addition, depending upon the salt other species including, Li_xPF_yO_z, Li_xBF_y, oligomeric borates, and lithium bis[N-(trifluoromethylsulfonylimino)] trifluoromethanesulfonate are observed.

Citation/Publisher Attribution

Parimalam, B. S., & Lucht, B. L. (2018). Reduction Reactions of Electrolyte Salts for Lithium Ion Batteries: LiPF6, LiBF4, LiDFOB, LiBOB, and LiTFSI. Journal of the Electrochemical Society, 165, A251-A255. doi: 10.1149/2.0901802jes

Available at: http://dx.doi.org/10.1149/2.0901802jes

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This work is licensed under a Creative Commons Attribution 4.0 License.