A 12v start-stop wide temperate lithium battery electrolyte with high and low temperature balance

Abstract

The invention discloses a high and low temperature balanced 12V start-stop wide temperate lithium battery electrolyte. The invention belongs to the technical field of lithium ion battery electrolyte. It mainly solves the problem in the prior art that the use of various additives to inhibit the deterioration of the lithium battery electrolyte will significantly increase the internal resistance of the battery and reduce the low-temperature performance, and achieve the effect of balancing the high and low temperature performance of the battery. Its main technical features are: the lithium salt is lithium hexafluorophosphate and lithium bisfluorosulfonimide, and the total weight of the lithium salt accounts for 15%~17%; the organic solvent is a mixture of ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate Solution, the total weight of the solvent accounts for 81%~84%; the additives are lithium difluorooxalate phosphate, lithium difluorooxalate phosphate and vinylene carbonate, and the contents are respectively 0.2%~1% and 0.2%~1% by weight. % and 0.5%~1.5%. The electrolytic solution of the present invention can exhibit good pulse discharge performance at low temperature, and good cycle performance at high temperature of 45° C. and above. In addition, this electrolyte still maintains excellent low-temperature properties after high-temperature cycling.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrolyte, and in particular relates to a 12V start-stop wide-temperate lithium-ion battery electrolyte with high and low temperature balance. Background technique [0002] Due to environmental pressure, countries around the world have formulated vehicle exhaust emission requirements in the next few years to gradually reduce CO2 per kilometer. 2 Emissions, in order to meet vehicle exhaust emission requirements, OEMs can only reduce fuel value by improving internal combustion engines and developing HEV (start-stop), PHEV, BEV, etc. New energy vehicles have attracted widespread attention from all walks of life. China's double credit policy is a powerful driving force to stimulate the development of new energy vehicles. However, for a long time, fuel vehicles still dominate the market, so the development of 12V start-stop and 48V start-stop is the key. The main direction of reducing th...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a 12V start-stop wide temperate lithium battery electrolyte with high and low temperature balance, to solve the prior art proposed in the above-mentioned background technology, using various additives to suppress the deterioration of the lithium battery electrolyte will make the battery The internal resistance rises significantly, the low temperature performance of the battery decreases, and the problem of the effect of achieving the balance of high and low temperature performance of the battery

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