Lithium ion battery electrolyte considering high and low temperature performances and battery

Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery electrolyte considering high and low temperature performances and a battery. Byadding the bis-pentafluorophenylphosphino compound into the electrolyte, a reduction reaction is performed on a negative electrode material prior to a solvent to form an SEI film with excellent performance, so that the co-intercalation of solvent molecules is prevented, the interface stability of the negative electrode is improved, and the low-temperature performance of a lithium ion battery is improved; and by complexing with HF in the electrolyte at a high temperature, the corrosion of HF in the electrolyte to a positive electrode material under the high-temperature and high-pressure conditions is avoided, and the high-temperature performance of the lithium ion battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-ion battery electrolyte and a battery with both high and low temperature performance. Background technique [0002] Lithium-ion batteries have been widely used in the fields of consumer electronics, electric vehicles and energy storage due to their high energy density, long cycle life, high operating voltage, low self-discharge effect, and no memory effect, and have achieved great commercial success. Especially in the field of electric vehicles, with the popularization of new energy vehicles in the fields of family vehicles, official vehicles, buses, taxis, and logistics vehicles, the proportion of annual sales of new energy vehicles will continue to increase significantly. [0003] With the development of lithium-ion batteries in the field of power battery applications, people have higher and higher requirements for lithium-ion batteries, requ...

AI Technical Summary

Problems solved by technology

[0006] In view of this, it is necessary to provide a lithium-ion battery electrolyte additive that takes into account high-temperature cycle performance, high-temperature storage performance, low-temperature cycle performance, and low-temperature storage performance, so as to improve the electrochemical performance of lithium-ion batteries under high-temperature and low-temperature conditions. There is a problem that lithium-ion batteries cannot take into account high and low temperature performance in the technology, so as to expand the application range of lithium-ion batteries

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