Over-charging safety non-aqueous electrolyte for lithium ion battery

Abstract

The invention discloses an over-charging safety non-aqueous electrolyte for a lithium ion battery. The over-charging safety non-aqueous electrolyte comprises an additive, wherein the additive is at least one of aryl sulfonamide, aryl sulfimide and cyclic imide. By adoption of the electrolyte, the lithium ion battery is high in over-charging resistance, and other electrochemical performances of the battery are not influenced.

Description

technical field [0001] The invention relates to an overcharging safe nonaqueous electrolytic solution for a lithium ion battery. Background technique [0002] Due to its many advantages: high energy density, high power density, long cycle life, green environmental protection, etc., lithium-ion batteries have been widely used in various electronic products such as mobile phones, digital cameras, and notebook computers. One of the strong candidates for vehicle power systems. [0003] However, the safety problems of lithium-ion batteries have seriously hindered the commercialization of large-scale lithium-ion batteries. When a lithium-ion battery is overcharged, excessive lithium precipitation and lithium insertion may occur on the electrode surface, resulting in thermal instability of the electrode, and rapidly causing an exothermic decomposition reaction between the electrode and the electrolyte interface. Under conditions such as abuse, this can lead to thermal runaway, po...

AI Technical Summary

Problems solved by technology

The addition of the above-mentioned additives has a good effect on battery overcharge safety, but will significantly affect battery performance, including battery cycle, high and low temperature and rate performance, etc.

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