A kind of mxene/graphene composite nanosheet and its preparation method and application, electrode pole piece and its application

Abstract

The invention provides an MXene / graphene composite nanosheet and its preparation method and application, an electrode pole piece and its application, and belongs to the technical field of two-dimensional materials. The preparation method of the MXene / graphene composite nanosheet provided by the present invention comprises the following steps: mixing MAX and hydrofluoric acid solution, etching, to obtain MXene; mixing said MXene and tetrabutylammonium hydroxide solution, performing electrostatic Ultrasonic treatment after adsorption to obtain exfoliated MXene nanosheets; mixing the exfoliated MXene nanosheets and graphene oxide suspension for self-assembly reaction to obtain MXene nanosheets / graphene oxide nanosheets; under a protective atmosphere, the MXene nanosheets / graphene oxide nanosheets undergo a reduction reaction to obtain MXene / graphene composite nanosheets. The graphene in the MXene / graphene composite nanosheet prepared by the preparation method provided by the invention does not re-stack, has excellent lithium storage performance, and can maintain the unique two-dimensional structure of MXene and graphene.

Description

technical field [0001] The invention relates to the technical field of two-dimensional materials, in particular to an MXene / graphene composite nanosheet and its preparation method and application, electrode pole piece and its application. Background technique [0002] Two-dimensional (2D) transition metal carbides (Ti 3 C 2 、Ti 2 C. Ta 4 C 3 etc.) and nitrides (Ti 3 CN or Ti 4 N 3 ) M n+1 x n Labeled as MXene, the structure is similar to graphene. MXene is derived from the general formula M n+1 AX n It is produced by selective corrosion of "A" metal in the three-dimensional MAX phase, where M represents transition metal, A represents IIIA or IVA group element, X is carbon (C) or nitrogen (N), n=1, 2 or 3. to Ti 3 AlC 2 As an example, in order to get from Ti 3 AlC 2 Phase extraction of Al atomic layers without destroying Ti 3 AlC 2 The layered morphology, usually Ti 3 AlC 2 The powder is soaked in hydrofluoric acid at room temperature, and the layered two-...

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Problems solved by technology

[0003] However, the surfaces of graphene oxide (GO) and MXene are rich in functional groups, and the surfaces of GO and MXene are usually negatively charged due to the ionization of functional groups, which makes it difficult for GO to interact with Ti 3 AlC 2 Coupled, and unstable micro-heterostructures are not conducive to the lithium storage performance of materials

Chinese patent CN107633954B discloses a graphene / MXene composite material and its application, in which MXene is only added as conductive particles between graphene layers, and MXene is not stripped, resulting in poor lithium storage performance

Chinese patent CN110942921A discloses a preparation method of a new type of three-dimensional composite airgel electrode material, in which NiCo-LDH is grown on the surface of multilayer layered MXene and then mixed with graphene oxide, and three-dimensional composite airgel is obtained through freeze-drying. However, the The re-stacking of MXene in the material is not resolved, and the lithium storage performance is hindered

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