A lithium-ion battery electrolyte and battery with both high and low temperature performance

Abstract

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. By adding bis-pentafluorophenylphosphino-based compounds in the electrolyte, the reduction reaction occurs on the negative electrode material in preference to the solvent to form an SEI film with excellent performance, prevent the co-intercalation of solvent molecules, improve the interface stability of the negative electrode, and improve lithium Low-temperature performance of ion batteries; complexation with HF in the electrolyte at high temperatures, avoiding the erosion of positive electrode materials by HF in the electrolyte under high temperature and high pressure conditions, and improving the high-temperature performance of lithium-ion batteries.

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 are widely used in 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 widespread popularity 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, requiring both hi...

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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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