Lithium ion battery electrolyte difficult to decompose under high voltage above 4.2V

Abstract

The invention discloses a lithium ion battery electrolyte difficult to decompose under a high voltage above 4.2V, comprising a sulphate derivative with structural formula, wherein n is equal to 0 to 8 , R1 to R8 are H or alkyl with carbon chain length of 1 to 6; the mass percent of the sulphate derivative in the electrolyte is 0.1% to 10%. The electrolyte of the invention is difficult to decompose under the high voltage, thereby improving the cycle performance of the lithium ion battery and less influencing the battery capacity.

Description

technical field The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte solution for lithium ion batteries. Background technique As a new type of green high-energy battery, lithium-ion batteries are widely used in mobile phones, cameras, notebooks, etc. Portable devices such as computers. With the application in electric vehicles, cordless power tools and military, higher requirements are placed on the energy density of lithium-ion batteries, and LiNiMnO 4 , LiNiCoMnO 2 , LiCoPO 4 Li-ion deintercalation reactions can occur at higher voltages (greater than 4.2 V), thus bringing new hope for improving the energy density of Li-ion batteries. However, the electrolyte of lithium-ion batteries is easy to decompose under high voltage, resulting in relatively low charge and discharge efficiency and poor cycle performance of lithium-ion batteries, which restricts the further development of high-voltage lithium-ion batteries. Conten...

AI Technical Summary

Problems solved by technology

However, the electrolyte of lithium-ion batteries is easy to decompose under high voltage, resulting in relatively low charge and discharge efficiency and poor cycle performance of lithium-ion batteries, which restricts the further development of high-voltage lithium-ion batteries

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