High-safety lithium-ion battery electrolyte solution

Abstract

The invention discloses a high-safety lithium-ion battery electrolyte solution, and belongs to the field of lithium-ion batteries. Main components of the electrolyte solution disclosed by the invention comprise an organic solvent, an electrolyte and additives, wherein at least a high flash point solvent is contained in the organic solvent, and the additives comprise a film additive and a flame retardant additive. The molar concentration of the electrolyte in the organic solvent is 0.8-1.5 mol / L, and the weight percentages of the additives in the electrolyte solution are 2-8% and 1-2% respectively. According to the high-safety lithium-ion battery electrolyte solution disclosed by the invention, by using the method that the high flash point solvent is combined with a small amount of the flame retardant additive for use, the electrolyte solution has a good flame retardant effect, is difficult to ignite, and is relatively short in self-extinguished time. When the electrolyte solution is used on the lithium-ion batteries, the safety performance of the batteries can be improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a high-safety lithium ion battery electrolyte. Background technique [0002] In recent years, with the development of science and technology, people's demand for high-energy-density lithium-ion batteries is more urgent. At present, increasing the working voltage of lithium-ion batteries is considered to be an effective way to increase their energy density. However, commonly used traditional carbonate-based electrolytes are prone to side reactions with the surface of positive electrode materials under high voltage. When the heat released by these chemical reactions cannot be evacuated in time, a series of chemical reactions will be triggered, and the battery temperature will rise sharply, eventually leading to The battery burns and explodes in severe cases. On the other hand, lithium-ion secondary batteries emit a lot of heat when they are overcharged and discharged, short-ci...

AI Technical Summary

Problems solved by technology

The addition of high boiling point and high flash point solvents increases the flash point of the electrolyte, making it difficult to ignite the electrolyte, but it cannot reduce the self-extinguishing time of the electrolyte

Images