Preparation method of high-temperature-resisting lithium battery

Abstract

The invention relates to a preparation method of a high-temperature-resisting lithium battery. The method comprises the steps that: (1) soluble polyimide resin is selected; (2) the soluble polyimide resin and polycarbosilane powder are mixed according to a mass ratio of 70-100:0-30; the mixture is dissolved in an organic solvent, such that a solution B is formed; (3) lithium ion salt is dissolved in the solution B, such that a polymer electrolyte solution is formed, wherein the molar concentration ratio of the lithium ion to imide rings in polyimide resin is 0.5-1:1; (4) the polymer electrolyte solution is molded on a cathode; the solvent in the polymer electrolyte solution is removed by volatilization under a high-temperature vacuum condition, such that a polymer electrolyte film is formed; and (5) an anode is prepared on the polymer electrolyte film, and a lithium battery is obtained after packaging. With the method provided by the invention, a problem of application limitation of existing solid-state condensate lithium batteries is solved. With the method provided by the invention, the polymer ion conductivity is effectively improved, the mechanical strength of the electrolyte film is improved, and the ion conductivity of the film is improved. The battery can be applied within a wider temperature range.

Description

technical field [0001] The invention relates to a preparation method of a high temperature resistant lithium battery. Background technique [0002] Lithium batteries consist of positive and negative electrodes, electrolytes, and polymer separators. For different electrolyte materials, separator materials are also different. At present, the most common lithium batteries use liquid electrolytes, and the separators used are polypropylene (PP), polyethylene (PE) single-layer microporous membranes, and PP The multi-layer microporous film compounded with PE is used as the isolation film. The production process of this type of isolation film can be divided into two categories according to the dry method and the wet method. At the same time, the dry method can be subdivided into the uniaxial stretching process and the biaxial stretching process. , this type of isolation film is the category with the largest demand. But liquid electrolyte lithium batteries have some inherent disadv...

AI Technical Summary

Problems solved by technology

[0005] The presence of solution in the gaps of the polymer separator of the existing solid condensate lithium battery will cause damage to the battery, and the polymer separator will react with other components of the battery under high temperature conditions, resulting in the failure of the solid condensate lithium battery. Limitations, based on solving the above technical problems, the present invention provides a method for preparing a high temperature resistant lithium battery