BATTERY ELECTROLYTE

In one aspect of the disclosure, an electrode assembly is presented. The electrode assembly includes a positive electrode, a negative electrode, a separator positioned between the positive electrode and the negative electrode, and an electrolyte. The electrolyte includes lithium hexafluorophosphate, lithium bis(fluorosulfonyl)imide, fluoroethylene carbonate, vinylene carbonate, and an additive dissolved in a solvent of ethylene carbonate and ethyl methyl carbonate. This electrolyte saturates the negative electrode, the positive electrode, and the separator. The additive is (S)-N-(1-(2-((4-(3-(trifluoromethyl)phenyl)piperazin-1-yl)methyl)pyrrolidin-1-yl)-3,3-dimethyl-1-oxobutan-2-yl)-3-methyl-2-(2-oxo-1,3-diazaspiro[4.5]decan-1-yl)butanamide, contributing to improved performance and stability of the electrode assembly.