Fluorinated electrolytes for 5-V Li-ion chemistry: Probing voltage stability of electrolytes with electrochemical floating test

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Abstract

A series of electrolyte formulations containing fluorinated cyclic carbonates and fluorinated linear carbonates with LiPF<inf>6</inf> has been evaluated as electrolyte solvents for high-voltage Li-ion batteries. The anodic stability of the new electrolytes on fully charged spinel LiNi<inf>0.5</inf>Mn<inf>1.5</inf>O<inf>4</inf> (LNMO) cathode was examined by electrochemical floating tests. The effects of fluorine substitution on the cyclic and linear carbonate, ratio of cyclic vs. linear carbonate, and LiPF<inf>6</inf> concentration on the electrolyte oxidation stability were investigated. Based on this study, the floating test proved to be an effective tool for identification of stable electrolyte materials.

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He, M., Hu, L., Xue, Z., Su, C. C., Redfern, P., Curtiss, L. A., … Zhang, Z. (2015). Fluorinated electrolytes for 5-V Li-ion chemistry: Probing voltage stability of electrolytes with electrochemical floating test. Journal of the Electrochemical Society, 162(9), A1725–A1729. https://doi.org/10.1149/2.0231509jes

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