Methods for manufacturing electrodes including fluoropolymer-based solid electrolyte interface layers

Patent · 04 January 2022

OSTI ID:1892513

Xiao, Xingcheng

Methods for manufacturing electrodes include applying a fluoropolymer film to a lithium-based host material, defluorinating the fluoropolymer film by heating to produce a lithium electrode having a solid electrolyte interface (SEI) layer including defluorinated fluoropolymers and at least about 5 wt. % LiF. The fluoropolymers can include one or more of fluorinated ethylenepropylene, perfluoroalkoxy alkanes, vinylidenefluoride, and copolymers of perfluoromethylvinylether and tetrafluoroethylene. The fluoropolymers can include one or more fluorinated monomers, including hexafluoropropylene, tetrafluoroethylene, ethylene-tetrafluoroethylene, perfluoroethers, and vinylidene fluoride. The —CF₃ functional groups of the defluorinated fluoropolymers can be about 3 wt. % to about 10 wt. % of the SEI layer. The SEI layer can include about 30 wt. % to about 50 wt. % LiF. The method can include assembling a battery cell by disposing a battery separator between a cathode and the electrode, and disposing the battery separator, the cathode, and the electrode in an electrolyte.

• Research Organization: GM Global Technology Operations, LLC, Detroit, MI (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: EE0007787
• Assignee: GM Global Technology Operations LLC (Detroit, MI)
• Patent Number(s): 11,217,781
• Application Number: 16/377,814
• OSTI ID: 1892513
• Country of Publication: United States
• Language: English