An electrolyte and a battery

Abstract

The present application relates to the field of energy storage materials, and in particular, to an electrolyte and a battery. An electrolyte solution, including an organic solvent, an electrolyte and an additive, the additive includes an additive A and an additive B, the additive A is selected from at least one of the compounds represented by the general formula I, the general formula II, and the general formula III, and the additive B is selected from At least one of a fluorophosphate compound and a fluorophosphite compound. The electrolyte of the present application can significantly improve the high temperature cycle performance and high temperature storage performance of the battery under high pressure conditions.

Description

technical field [0001] The present application relates to the field of energy storage materials, in particular, to an electrolyte and a battery. Background technique [0002] Today's electric vehicle market is facing unprecedented opportunities and challenges in the world. In order to meet the market's requirements for high-energy-density lithium-ion batteries, researchers continue to increase the upper limit of the cut-off voltage of the battery system. However, under high working voltage, the oxidation ability of the positive electrode active material to the electrolyte is significantly enhanced. At the same time, with the dissolution of transition metal elements and the destruction of the crystal structure, the lithium ion secondary battery will cause the electrolyte to deteriorate during high temperature storage and cycle testing. The organic solvents in the lithium-ion secondary battery are continuously oxidized and decomposed, resulting in volume expansion and material...

AI Technical Summary

Problems solved by technology

However, under high working voltage, the oxidation ability of the positive electrode active material to the electrolyte is significantly enhanced. At the same time, with the dissolution of transition metal elements and the destruction of the crystal structure, the lithium ion secondary battery will cause the electrolyte to deteriorate during high temperature storage and cycle testing. The organic solvents are continuously oxidized and decomposed, resulting in volume expansion and material inactivation of lithium-ion secondary batteries, resulting in capacity attenuation and safety hazards of lithium-ion secondary batteries

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