Fluoride-Free Surface Passivation Enables Low-Concentration Nonflammable Electrolytes for K-Ion BatteriesClick to copy article linkArticle link copied!
- Andrew W. EllsAndrew W. EllsDepartment of Chemical Engineering, Columbia University, New York, New York 10027, United StatesMore by Andrew W. Ells
- Pablo J. Buitrago BoteroPablo J. Buitrago BoteroDepartment of Chemical Engineering, Columbia University, New York, New York 10027, United StatesMore by Pablo J. Buitrago Botero
- Bret SchumacherBret SchumacherDepartment of Earth and Environmental Engineering, Columbia University, New York, New York 10027, United StatesMore by Bret Schumacher
- Lakshmi BhaiLakshmi BhaiDepartment of Chemical Engineering, Columbia University, New York, New York 10027, United StatesDepartment of Chemistry, Columbia University, New York, New York 10027, United StatesMore by Lakshmi Bhai
- Lauren E. Marbella*Lauren E. Marbella*Email: [email protected]Department of Chemical Engineering, Columbia University, New York, New York 10027, United StatesMore by Lauren E. Marbella
Abstract
Here, we show that a low-concentration (1 M) KPF6 electrolyte combining ethylene carbonate, propylene carbonate, and triethyl phosphate (TEP) achieves stable cycling with graphite anodes, retains high ionic conductivity, and is nonflammable. Surface characterization of the solid–electrolyte interphase (SEI) reveals that KPF6 does not reduce to KF. Instead, TEP results in the accumulation of inorganic phosphates that passivate against reductive decomposition of carbonate solvents and lessen resistance to K-ion transport through the SEI. Overall, carbonate/phosphate solvent mixtures serve as a nonflammable baseline for future engineering of the SEI layer that eliminates ionically insulating fluorinated phases.
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This article is cited by 1 publications.
- Pablo J. Buitrago Botero, Andrew W. Ells, Asya Svirinovsky-Arbeli, Mikkel Juelsholt, Lauren E. Marbella. Counterion Lewis Acidity Determines the Rate of Hexafluorophosphate Hydrolysis in Nonaqueous Battery Electrolytes. Journal of the American Chemical Society 2025, 147
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, 9159-9174. https://doi.org/10.1021/jacs.4c12469
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