Preparation method of three-dimensional foamed MoS2/graphene

Abstract

The invention discloses a preparation method of three-dimensional foamed MoS2 / graphene. With a mixed solution of ammonium tetrathiomolybdate and dimethyl formamide as a three-dimensional MoS2 reaction material solution, graphene is dipped and dyed and then is subjected to heat preservation in hydrogen and argon atmosphere of a tube furnace, so as to obtain the three-dimensional foamed MoS2 / graphene. Compared with the traditional lithium ion battery anode composite material, the preparation method has obvious advantages that (a) the material loss in the preparation process is reduced, and the preparation method is easy to operate and industrially produce; and (b) the prepared three-dimensional foamed MoS2 / graphene has the advantages of high specific capacity and high cycling stability.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a three-dimensional foam MoS 2 / The preparation method of graphene. Background technique [0002] With the rapid development of nanotechnology, the application of nanomaterials in the field of lithium-ion battery anodes has received extensive attention at home and abroad. Common negative electrode materials for lithium-ion batteries include carbon materials, oxides, nitrides, alloys, and salts. Generally, the batteries used in commercial use are mainly based on traditional graphite materials. The main graphite materials should be hexagonal, with a typical sandwich layered structure, and the layers are composed of sp 2 The covalent bonds formed by hybridization are combined with van der Waals forces between the layers. Covalent bonds have good electrical conductivity, the interlayer distance is 340pm, and it has good intercalation lithium storage capacity. Graphite, as a negati...

AI Technical Summary

Problems solved by technology

The covalent bond has good electrical conductivity, the distance between layers is 340pm, and it has a good intercalation lithium storage capacity. Graphite, as the negative electrode material of lithium-ion batteries, also has obvious shortcomings and limitations.

There are many surface defects in graphite, and it is difficult to form a uniform and dense SEI film at one time during the first discharge process, resulting in low initial charge efficiency. However, due to the large volume strain of lithium ions during the intercalation and extraction process, multiple cycles will lead to interlayer graphite peeling, and the cycle poor performance

Graphite itself has low density, low volume energy density, and poor rate cycle performance, so it is difficult to be applied in power batteries