Electrolyte suitable for silicon-carbon system lithium ion battery

Abstract

The invention provides an electrolyte suitable for a silicon-carbon system lithium ion battery and the silicon-carbon system lithium ion battery comprising the electrolyte. The electrolyte provided bythe invention comprises an organic solvent, an additive and a lithium salt, wherein the additive comprises trifluoromethyl triethyl lithium borate, propenyl-1, 3-sultone and fluoroethylene carbonate,the cycle life of the silicon-carbon battery can be remarkably prolonged by combined use of the additive, and meanwhile, the high and low temperature performance and safety performance are both considered; therefore, the silicon-carbon battery is more suitable for large-scale commercial production.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to an electrolyte suitable for silicon-carbon system lithium-ion batteries. Background technique [0002] Since the commercialization of lithium-ion batteries, due to its high specific energy and good cycle performance, it has been widely used in digital, energy storage, power, military aerospace and communication equipment and other fields. With the wide application of lithium-ion batteries, consumers are constantly improving the use environment and demand for lithium-ion batteries, and at the same time have higher and higher requirements for the battery life of electronic equipment. Has a higher energy density. [0003] Silicon carbon battery is one of the effective means to increase the energy density of the battery, and the electrolyte is one of the main materials of the silicon carbon lithium ion battery, which plays a role in the transmission of Li i...

AI Technical Summary

Problems solved by technology

However, it is often difficult for the current electrolyte additives to form a strong and tough SEI film to withstand the damage caused by the expansion of the silicon neg

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