Preparation method for molybdenum disulfide/nitrogen-doped graphene three-dimensional composite material and application of molybdenum disulfide/nitrogen-doped graphene three-dimensional composite material

Abstract

The invention relates to a preparation method for a molybdenum disulfide / nitrogen-doped graphene three-dimensional composite material. The preparation method comprises the steps: preparing a few-layer molybdenum disulfide nanosheet dispersion solution from molybdenum disulfide powder serving as a raw material and N-methyl pyrrolidone serving as an intercalation solvent by an ultrasonic solvent thermal intercalation stripping method, mixing the few-layer molybdenum disulfide nanosheet dispersion solution with a graphene oxide aqueous solution to prepare a uniform molybdenum disulfide / graphene oxide dispersion system with different proportions, forming a compact molybdenum disulfide / graphene oxide composite structure from a solution under the action of sodium ions in a solution self-assembling process, performing in-situ reducing by using hydrazine hydrate to obtain a molybdenum disulfide / reduced graphene oxide three-dimensional composite system, and performing high-temperature nitrogen doping process under an ammonia atmosphere so as to obtain the molybdenum disulfide / nitrogen-doped graphene three-dimensional composite material. The method can be used for better balancing component control and structure control; the process is simple, and large-scale production is easy. The obtained molybdenum disulfide / nitrogen-doped graphene three-dimensional composite material can be applied to negative electrodes of high-performance lithium batteries.

Description

technical field

[0001] The invention relates to a preparation method and application of a molybdenum disulfide / nitrogen-doped graphene three-dimensional composite material, which belongs to the technical field of energy storage materials. Background technique

[0002] In recent years, with the rapid consumption of fossil fuels and increasing air pollution, people have accelerated the pace of research and development of new energy materials. Molybdenum disulfide is a two-dimensional lamellar crystal material, and its special layered structure provides the possibility for the intercalation and extraction of lithium ions, so this material has received more and more research on lithium-ion battery electrodes. Liu et al. used the heavy stacking effect to increase the distance between the stripped molybdenum disulfide nanosheets to a certain extent, which enhanced its cycle capacity and cycle stability at low currents (GD Du, HK Liu, et al.Superior stability and high capacity of ...

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