A kind of preparation method of structure-stable lithium battery composite electrode powder material

Abstract

The present invention discloses a preparation method of a lithium battery composite powder body material with a stable structure, belonging to the technical field of new energy materials. The method comprises the steps of: performing reaction of a pretreated oxidized graphene dispersion liquid, a melamine solution and a modified gelatin dispersion liquid to prepare xerogel, performing smashing andscreening of the xerogel to obtain hydrogel crushed aggregates, and performing heating reflux reaction of the hydrogel crushed aggregates, the silicate ester diluent, trimethylaluminum and oleic acidto prepare ordered load hydrogel crushed aggregates, and performing mixed reaction of the ordered load hydrogel crushed aggregates and an ammine silver solution, performing hydrazine hydrate reduction to prepare a reduction material, and finally controlling different temperature rise rates and processing rates to perform high-temperature reaction of the reduction material to prepare a lithium battery composite powder body material with a stable structure. The product prepared in the invention is stable in structure in the use process, effectively avoids decreasing of the performances due to volume expansion, effectively improves the service life, the use safety and the cycle stability of the product and forms a push effect on development of the new energy field.

Description

technical field [0001] The invention discloses a preparation method of a structurally stable lithium battery composite electrode powder material, which belongs to the technical field of new energy materials. Background technique [0002] Lithium-ion batteries are generally composed of four major parts: positive electrode, negative electrode, electrolyte and separator. Among them, the separator separates the positive and negative electrodes of the battery to prevent the positive and negative electrodes from directly contacting and short-circuiting. At the same time, the separator also has the function of passing electrolyte ions. Polyethylene is the most commonly used diaphragm material, and currently commercialized lithium battery diaphragm materials mainly use polyethylene and polypropylene microporous membranes. Electrolyte is the carrier of ion transport in lithium battery. Generally composed of organic solvents and lithium salts. The commonly used lithium salt is LiP...

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Problems solved by technology

[0008] The main technical problem to be solved by the present invention is: in view of the volume expansion of the traditional silicon negative electrode in the process of use, which causes the safety and cycle stability to decrease, and the combination of silicon raw materials and carbon raw materials can solve this technical problem to a certain extent , but because the silicon raw material and the carbon raw material are only physically mixed, there is no chemical bond between the two, resulting in the separation of the two during use, causing performance degradation, and silicon carbide realizes the organic combination of the two However, silicon carbide as the negative electrode still has the defects that the structure is difficult to control and the rate performance is not high. It provides a preparation method of a structurally stable lithium battery composite electrode powder material

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