Electrolyte for lithium ion battery

Abstract

The invention discloses an electrolyte for a lithium ion battery. The electrolyte for the lithium ion battery comprises a solvent, lithium salt and an additive, wherein measured by 100 percent of thesum of the mass of the solvent and the additive, the mass fraction of the solvent is 97.5-99.5 percent, and the rest is the additive; the lithium salt has a concentration of 1.0-1.15 mol / L; the additive is trifluoromethylsulfonic acid-3-methyl-1,1'-thionyl diimidazole ionic liquid. Compared with the prior art, the electrolyte disclosed by the invention has the benefits that through adding the trifluoromethylsulfonic acid-3-methyl-1,1'-thionyl diimidazole ionic liquid in a conventional electrolyte, the problems of high temperature circulation and high pressure circulation in a ternary / graphitelithium ion battery are solved, so that the high temperature circulation and the high pressure circulation of an LiNixCoyMnzO2 / graphite-lithium ion battery are improved; meanwhile, the initial electrical performance and the rate performance of the battery are better.

Description

technical field [0001] The invention belongs to the technical field of new materials and electrochemistry, and in particular relates to an electrolyte solution for a lithium ion battery. technical background [0002] Lithium-ion batteries have been widely used due to their high energy density, good cycle performance, environmental protection and pollution-free, and have become the preferred power batteries for electric vehicles and hybrid electric vehicles. With the gradual development of electric vehicles and hybrid electric vehicles, higher requirements are placed on the performance of lithium-ion batteries, which need to have the advantages of high energy density, good safety, and good low-temperature performance. [0003] At present, traditional lithium-ion batteries, such as lithium manganese oxide batteries, lithium iron phosphate batteries, and ternary batteries, are difficult to meet the requirements of electric vehicles and hybrid electric vehicles for lithium-ion b...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to overcome the shortcomings and deficiencies of the high temperature and high pressure cycle performance of lithium-ion batteries in the prior art. On the one hand, it provides an electrolyte for lithium-ion batteries, including solvents, lithium salts and additives, wherein the solvent and additives The sum of the mass of the solvent is 100%, the mass fraction of the solvent is 97.5 to 99.5%, and the rest are additives; the concentration of the lithium salt is 1.0 to 1.15mol / L; the additive is trifluoromethanesulfonic acid-3- Methyl-1,1'-sulfonyldiimidazolium Ionic Liquid

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