Summary:

The present invention belongs to the technical field of lithium-ion battery, and more specifically, relates to a fast-charging electrolyte with high concentration of nitrile dilution and high concentration for lithium battery and its application. The electrolyte consists of nitrile organic solvents, lithium salts and diluents. Nitrile has a high dielectric constant, which can dissolve lithium salts well, and good oxidation stability ensures that it can work at high voltage, and improves the reduction stability of the electrolyte after increasing the concentration of lithium salts. The diluents are fluorine-containing aromatics and fluoroethers, and the addition of diluents can effectively reduce the density and viscosity of the electrolyte without affecting its reduction stability. When the current density is increased from 0.2C to 8C, the capacity retention rate of the battery assembled with the electrolyte of the present invention is as high as 80%, and the rate performance is much better than that of the battery assembled by the commercial carbonate electrolyte. The fast-charging electrolyte with nitrile dilution and high concentration for lithium battery of the present invention has broad application prospects.

Link: http://epub.cnipa.gov.cn/patent/CN113659211A?8kt2YOWWXQBD=1684289823287