NIO Inc.
Zero flammability electrolyte for lithium-ion cell

Abstract:

An electrolyte for a lithium-ion cell, comprises an organic solvent mixture comprising: (a) a hydrofluorinated ether base solvent to dissolve a lithium salt; (b) a fluorinated linear and/or cyclic ester co-solvent to form an SEI layer on a surface of the active materials; and (c) a fluorinated linear and/or cyclic ester co-solvent having a viscosity less than a viscosity of each of the hydrofluorinated ether base solvent and SEI-layer forming fluorinated linear and/or cyclic ester co-solvent to reduce a viscosity of the organic solvent mixture and a lithium salt dissolved in the organic solvent mixture.