Electrolyte for lithium-ion battery

Abstract

The invention discloses an electrolyte for a lithium-ion battery. The electrolyte comprises an electrolyte salt, a non-aqueous organic solvent and additives, wherein the additives are phosphate ester, phosphonitrile and fluorinated ethylene carbonate; the fluorinated ethylene carbonate has relatively good chemical stability and physical stability and relatively high flashing and dielectric constants, and is capable of relatively well dissolving an electrolyte lithium salt to mix with the organic solvent when added to the electrolyte as one additive; the electrolyte salt is lithium hexafluorophosphate; and the non-aqueous organic solvent is dimethyl carbonate, 15-crown (ether)-5 and whole amine cryptand. The electrolyte disclosed by the invention to the lithium-ion battery, so that the cycle performance of the lithium-ion battery at a high temperature is improved and the electrolyte has relatively good fire resistance and security.

Description

technical field [0001] The invention relates to a lithium ion battery electrolyte. Background technique [0002] Lithium-ion batteries are used in a wide range of fields, including electronic terminal equipment such as mobile phones and laptop computers, and even to the fields of electric vehicles and energy storage technology; lithium-ion batteries are structurally divided into positive electrodes, negative electrodes, diaphragms, electrolytes, and shells. [0003] Electrolyte is one of the four key materials of lithium-ion batteries (positive electrode, negative electrode, diaphragm, and electrolyte). It is known as the "blood" of lithium-ion batteries. Guarantee of high voltage, high specific energy and other advantages. The electrolyte used in lithium-ion batteries is an ionic conductor in which an electrolyte lithium salt is dissolved in an organic solvent. Generally, the organic electrolyte used as a practical lithium-ion battery should have the following properties:...

AI Technical Summary

Problems solved by technology

Based on the above requirements, the lithium-ion battery electrolytes currently on the market still need to be improved.