Date of Original Version
Three different organic solvents (dimethylacetamide (DMAc), dimethylformamide (DMF), and dimethyl sulfoxide (DMSO)) were used to improve the solubility of LiNO3 in a standard carbonate-based electrolyte with lithium difluoro(oxalato)borate (LiDFOB) as the salt. Together, the LiDFOB and organic-solvent solubilized LiNO3 preferentially reduce on the surface of silicon-containing anodes to create an SEI rich in oxalates, nitrate decomposition species, and B-F species. The improved stability of the SEI throughout the first 100 cycles results in silicon and silicon/graphite composite anodes with better capacity retention than observed with standard electrolytes or fluoroethylene carbonate (FEC) containing electrolytes. This study demonstrates the feasibility of the use of non-traditional electrolyte solvents in the improvement and optimization of lithium ion-battery electrolytes.
Publication Title, e.g., Journal
Journal of The Electrochemical Society
Rynearson, L., Jayawardana, C., Yeddala, M. & Lucht, B. L. (2023). Improved Performance of Silicon-Containing Anodes with Organic Solvent-Solubilized Lithium Nitrate. Journal of The Electrochemical Society, 170, 060525. https://doi.org/10.1149/1945-7111/acdd26
Available at: https://doi.org/10.1149/1945-7111/acdd26
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