Anti-overcharge low-temperature electrolyte and lithium ion battery based on same

Abstract

The invention discloses an anti-overcharge low-temperature electrolyte and a lithium ion battery based on the same, and belongs to the technical field of lithium ion batteries. The anti-overcharge low-temperature electrolyte comprises an organic solvent, a lithium salt, a low-impedance film-forming additive and an anti-overcharge additive, wherein the organic solvent comprises a carbonic ester solvent and a linear carboxylic ester solvent; the lithium salt comprises one or more of lithium hexafluorophosphate, lithium difluorophosphate, lithium tetrafluoroborate and lithium difluoro (oxalato) borate; the low-impedance film-forming additive is at least two of vinylene carbonate, 1, 3-propane sultone and ethylene sulfite; the anti-overcharge additive is 1, 4-di-tert-butyl-2, 5-dimethoxybenzene, wherein the content of the organic solvent is 78 wt%-82 wt%, the content of the lithium salt is 15 wt%-18 wt%, the content of the anti-overcharge additive is 1 wt%-2 wt%, and the balance is the low-impedance film-forming additive. The lithium ion battery solves the safety problem caused by low discharge capacity and even incapability of discharging of the existing lithium ion battery at low temperature and over-charge and over-discharge.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to an anti-overcharge low-temperature electrolyte and a lithium ion battery based thereon. Background technique [0002] With the advancement of energy technology, lithium-ion batteries are more and more widely used in the fields of digital, power, energy storage and military aerospace. The expansion of application scenarios requires lithium-ion batteries to have the characteristics of both high and low temperature performance, especially the special requirements under extreme low temperature conditions. At the same time, since the current lithium-ion batteries mostly use flammable carbonate and carboxylate organic electrolytes, it is very likely to cause combustion or even explosion under extreme working conditions, such as overcharge, overdischarge and overheating, resulting in A big security risk. Therefore, the development of an electrolyte with high safety and low...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a kind of anti-overcharge low-temperature electrolyte and lithium-ion battery based on it, solve the problem that the discharge capacity of the existing lithium-ion battery is low or even unable to discharge at low temperature and due to Safety problems caused by overcharge and discharge, the lithium-ion battery based on the anti-overcharge low-temperature electrolyte has excellent anti-overcharge performance, and has excellent ultra-low temperature discharge performance

Images