Thermal runaway-proof electrolyte, lithium-ion battery and battery pack

Abstract

The present application specifically discloses a thermal runaway-proof electrolyte, a lithium-ion battery and a battery pack. A thermal runaway-proof electrolyte comprises an organic solvent and an additive; the organic solvent comprises a cyclic carbonate and a chain carbonate; the cyclic carbonate comprises ethylene carbonate; the chain carbonate comprises a first chain carbonate and a second chain carbonate, the first chain carbonate comprises dimethyl carbonate, and the second chain carbonate comprises at least one of ethyl methyl carbonate, diethyl carbonate and methyl propyl carbonate; the mass proportion of the cyclic carbonate in the electrolyte is 2%-20%; the mass proportion of the first chain carbonate in the electrolyte is 51%-60%, and the mass proportion of the second chain carbonate in the electrolyte is 10%-25%; the additive comprises fluoroethylene carbonate and difluoroethylene carbonate. The present application has the advantages of taking into account both the electrochemical performance of lithium batteries and the thermal runaway-proof performance.

Images