1. A non-aqueous sodium hexafluorophosphate-based electrolyte degradation study: Formation and mitigation of hydrofluoric acid
- Author
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Joseph J. Dumais, Hui Xiong, Devan Karsann, Quinn White, Eric J. Dufek, Paige Skinner, Miu Lun Lau, Erik Storch, Kassiopeia Smith, Changjian Deng, Riley Parrish, Pete Barnes, and Chris Jones
- Subjects
Battery (electricity) ,Aqueous solution ,Renewable Energy, Sustainability and the Environment ,Chemistry ,Sodium hexafluorophosphate ,Inorganic chemistry ,Energy Engineering and Power Technology ,Sodium-ion battery ,Electrolyte ,Solvent ,chemistry.chemical_compound ,Hydrolysis ,Hydrofluoric acid ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry - Abstract
Fundamental characterization of battery electrolyte is vital for rechargeable batteries. This work reports the chemical stability of sodium hexafluorophosphate (NaPF6)-based non-aqueous electrolytes containing different solvent mixtures (e.g., cyclic and acyclic carbonates) in the presence of water for Na-ion batteries. A degradation study is conducted using NaPF6-based electrolytes, highlighting two electrolyte additives, 2,2,2-trifluoroethoxy-2,2,2-ethoxy phosphazene (FM2) and fluoroethylene carbonate (FEC), on degradation and cell performance of Na-ion batteries. Hydrolysis of NaPF6 in acidic condition is particularly prone to form hydrofluoric acid (HF), and can be observed in electrolytes made with battery grade carbonate solvents (
- Published
- 2020