Preparation method of negative electrode active material for lithium-ion battery

Abstract

The invention provides a preparation method of a negative electrode active material for a lithium-ion battery. The method comprises the following steps: dissolving nonionic polysaccharide into a water solution, adding a certain amount of graphene-like transition metal disulphide, carrying out ultrasonic dispersing and stripping for a period of time and then centrifuging the solution to obtain a disperse solution of the non-ionic polysaccharide / graphene-like transition metal disulphide; carrying out freeze drying, roasting the product in a nitrogen atmosphere for a certain period of time, taking out the product, alloying and grinding the product and potassium hydroxide, and then burning and activating the mixture in the nitrogen atmosphere to obtain the graphene-like transition metal disulphide / porous carbon material. The graphene-like transition metal disulphide / porous carbon material is applied as the negative electrode material for the lithium-ion battery. The graphene-like transition metal disulphide is stripped through the non-ionic polysaccharide, so that the method is green, simple and effective; and meanwhile, the obtained graphene-like transition metal disulphide / porous carbon material is suitable for the negative electrode material for the lithium-ion battery, excellent in performance and beneficial to industrial production and application.

Description

technical field [0001] The invention belongs to the field of materials science, and relates to a lithium ion battery, in particular to a preparation method of a negative electrode active material of the lithium ion battery. Background technique [0002] The growing demand for energy conversion and storage worldwide has promoted the rapid development of diverse energy storage materials and devices. Lithium-ion batteries are widely used in portable electronic devices due to their high energy density, long cycle life and no memory effect. In recent years, the development of electric equipment has put forward higher requirements for the power density and energy density of lithium-ion batteries, and electrode materials are the decisive factors for the performance improvement of lithium-ion batteries. In terms of negative electrode materials, the current commercial lithium ion battery negative electrode material graphite theoretical capacity (372mAh / g) is low, which limits the im...

AI Technical Summary

Problems solved by technology

At present, the method of constructing graphene-like transition metal dichalcogenides / carbon composites is almost mainly prepared by hydrothermal or high-temperature reaction of different carbon-based materials with transition metal dichalcogenide precursors, among which graphene-like transition metal The generation of disulfides is still based on the synthesis of precursor compounds, so the layer number control and crystal integrity of graphene-like transition metal dichalcogenides are greatly affected during the synthesis process.

In addition, the use of a large number of graphene-like transition metal dichalcogenide precursors inevitably leads to waste and environmental pollution.

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