A method for preparing a molybdenum disulfide/graphene battery negative electrode material based on a three-dimensional framework formed by graphene self-assembly

Abstract

The invention relates to a preparation method of a molybdenum disulfide / graphene battery negative electrode material formed on the basis of graphene self-assembling, and belongs to the field of a battery negative electrode material. The problem of low charge-discharge performance caused by the fact that a large amount of defects exist in the charging and discharging processes of molybdenum disulfide is solved. The method comprises the following steps: 1, dissolving ammonium molybdate powder and thiourea powder into an aqueous solution of graphite oxide, performing magnetic stirring until the solution is uniform and stable and dropwise adding concentrated ammonia water to adjust the pH value to be 9 to 10; 2, transferring to a mold of polytetrafluoroethylene lining, sealing, putting into astainless steel high-pressure kettle, performing heating reaction and cooling to room temperature; 3, taking out, washing with concentrated ammonia water for at least 3 times, 4, soaking in an ethanolaqueous solution for at least 6 hours, taking out, performing pre-freezing treatment, and vacuum-drying to obtain the molybdenum disulfide / graphene battery negative electrode material based on a graphene self-assembling three-dimensional skeleton. The battery negative electrode material obtained by the method has high charge-discharge cycle performance.

Description

technical field [0001] The invention belongs to the field of battery negative electrode materials; in particular, it relates to a method for preparing a molybdenum disulfide / graphene battery negative electrode material based on a three-dimensional framework formed by graphene self-assembly. Background technique [0002] With the development of science and technology, more requirements are put forward for chemical power sources, which need to develop in the direction of small size, light weight and long life. With the development of industry, the problem of environmental pollution is becoming more and more serious, and chemical power supply will play a more important role as a clean power supply. As a new type of anode material, molybdenum disulfide / graphene three-dimensional material has extremely high theoretical specific capacity and charge-discharge cycle performance. [0003] The existing molybdenum disulfide / graphene composite material preparation method has a low yiel...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at problems such as uneven distribution of molybdenum disulfide and a large number of defects in the molybdenum disulfide / graphene composite material, and proposes to adjust the pH value of the solution by using ammonia water, so that a part of molybdenum disulfide (with a large number of defects) is oxidized to MoO 3 , and the resulting MoO was treated with ammonia 3 The method of dissolving and removing

The invention solves the problem of poor charge-discharge cycle performance caused by the existence of a large number of defects in the charge-discharge process of molybdenum disulfide

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