Flame-retardant electrolyte of lithium ion battery and preparation method of electrolyte

Abstract

The invention belongs to the technical field of battery material preparation, and specifically relates to a flame-retardant electrolyte of a lithium ion battery and a preparation method of the electrolyte. The flame-retardant electrolyte consists of a solvent, an accessory solvent, a film forming agent, a cosolvent, flame retardant and lithium salt; the preparation method comprises the steps of performing mixing on ethylene carbonate, diethyl carbonate and methyl ethyl carbonate in a glove box filled with argon to prepare a mixed solvent; next, adding the accessory solvent, the film forming agent, the cosolvent and the flame retardant into the mixed solvent to be mixed uniformly to obtain a mixed liquid; and finally, dissolving the lithium salt into the mixed liquid to obtain the flame-retardant electrolyte of the lithium ion battery. The obtained flame-retardant electrolyte has relatively high flame-retardant effect, so that the safety and reliability of the lithium ion battery can be effectively improved; meanwhile, the flame-retardant electrolyte has relatively high compatibility with a graphite carbon negative electrode; and furthermore, the lithium ion battery assembled by the flame-retardant electrolyte has high electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of battery material preparation, and in particular relates to a flame-retardant electrolyte for a lithium-ion battery and a preparation method thereof. Background technique [0002] Due to the advantages of high energy density, high output voltage, long cycle life, and low environmental pollution, lithium-ion batteries have extremely important applications in the fields of electronic products, electric vehicles, aerospace, and energy storage. However, in recent years, reports about fires and even explosions caused by lithium-ion batteries have become common. The safety of lithium-ion batteries has attracted people's attention, and at the same time, safety issues have become a bottleneck restricting the development of lithium-ion batteries in the direction of large-scale and high-energy. The most important components of a lithium-ion battery are the positive and negative electrode materials and the electrolyt...

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention: Aiming at the defect that the compatibility between the existing flame retardant electrolyte and the graphite carbon negative electrode is poor, and the reduction of the flammability of the electrolyte usually needs to be sacrificed at the cost of battery performance, a flame retardant lithium ion battery is provided. Electrolyte and its preparation method