Gel electrolyte membrane, lithium ion battery, and preparation methods therefor

Abstract

The invention relates to a gel electrolyte membrane, a lithium ion battery, and preparation methods therefor. The preparation method for the gel electrolyte membrane comprises the steps of providing a battery electrode plate; preparing gel electrolyte precursors of different viscosities; and forming the gel electrolyte membranes on at least one surface of the electrode plate by the gel electrolyte precursors of different viscosities, testing the mechanical strengths of the gel electrolyte membranes prepared from the gel electrolyte precursors of different viscosities, making a corresponding viscosity-mechanical strength standard curve, and obtaining a target gel electrolyte membrane prepared by selecting the gel electrolyte precursors of different viscosities according to the standard curve corresponding to the predetermined mechanical strength of the target gel electrolyte membrane. The invention also relates to the gel electrolyte membrane prepared by the method, and also relates to a preparation method for the lithium ion battery which is prepared from a gel electrolyte membrane cell after the gel electrolyte membrane cell is obtained by adopting the gel electrolyte membrane, and the lithium ion battery prepared by the lithium ion battery preparation method.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of lithium ion batteries, in particular to a gel electrolyte membrane, a lithium ion battery and a preparation method thereof. [0003] 【Background technique】 [0004] The field of lithium-ion batteries as the main power source has developed from portable mobile devices to power vehicles and large energy storage devices. With social development and scientific and technological progress, people's demand for high-power and large-capacity lithium-ion batteries is becoming more and more urgent, and safety is the primary problem that needs to be solved in the development of large-scale lithium-ion batteries in the future. The liquid electrolytes commonly used in liquid lithium-ion batteries contain organic solvents with low flash point and low fire point, which are flammable and explosive. The battery is extremely easy to catch fire, burn or even explode under extreme conditions such as short circuit, ove...

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the technical problem of poor controllability of the mechanical strength of the existing polymer electrolyte membrane, the invention provides a gel electrolyte membrane, a lithium ion battery and a preparation method thereof

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