Improved Performance of Silicon-Containing Anodes with Organic Solvent-Solubilized Lithium Nitrate

Rynearson, Leah (ORCID:0000000334727630); Jayawardana, Chamithri (ORCID:0000000231446377); Yeddala, Munaiah; Lucht, Brett L. (ORCID:0000000246600840)

doi:10.1149/1945-7111/acdd26

DOE OSTI · 1985733

Improved Performance of Silicon-Containing Anodes with Organic Solvent-Solubilized Lithium Nitrate

Rynearson, Leah (ORCID:0000000334727630)·Jayawardana, Chamithri (ORCID:0000000231446377)·Yeddala, Munaiah·Lucht, Brett L. (ORCID:0000000246600840)

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Abstract

Three different organic solvents (dimethylacetamide (DMAc), dimethylformamide (DMF), and dimethyl sulfoxide (DMSO)) were used to improve the solubility of LiNO 3 in a standard carbonate-based electrolyte with lithium difluoro(oxalato)borate (LiDFOB) as the salt. Together, the LiDFOB and organic-solvent solubilized LiNO 3 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.

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25 ENERGY STORAGE Electrochemistry Materials Science

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Rynearson, Leah (ORCID:0000000334727630), Jayawardana, Chamithri (ORCID:0000000231446377), Yeddala, Munaiah, Lucht, Brett L. (ORCID:0000000246600840). 2023-06-19. Improved Performance of Silicon-Containing Anodes with Organic Solvent-Solubilized Lithium Nitrate. https://doi.org/10.1149/1945-7111%2Facdd26

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