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

A graphene nanosheet and graphene composite technology, applied in the field of two-dimensional materials, can solve the problems of poor lithium storage performance, lithium storage performance hindrance, microscopic heterogeneous structure unfavorable lithium storage performance of materials, etc., and achieve excellent lithium storage performance Effect

Active Publication Date: 2021-08-27
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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

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preparation example Construction

[0028] The invention provides a kind of preparation method of MXene / graphene composite nanoplate, comprises the following steps:

[0029] Mix MAX and hydrofluoric acid solution for etching to obtain MXene;

[0030] The MXene and the tetrabutylammonium hydroxide solution are mixed, and ultrasonic treatment is carried out after electrostatic adsorption to obtain a dispersion liquid of stripping MXene nanosheets;

[0031] The stripped MXene nanosheet dispersion is mixed with the graphene oxide suspension to carry out a self-assembly reaction to obtain MXene nanosheets / graphene oxide nanosheets;

[0032] Under a protective atmosphere, the MXene nanosheets / graphene oxide nanosheets are subjected to a reduction reaction to obtain MXene / graphene composite nanosheets.

[0033] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0034] The invention mixes MAX and hydrofluoric a...

Embodiment 1

[0069] (1) Put 3g of MAX powder in 60mL of 40wt% hydrofluoric acid solution to etch for 24h under stirring conditions, centrifuge, wash the obtained solid components with deionized water, and freeze-dry them at -45°C for 24h to obtain MXene;

[0070] (2) 2g of the MXene was placed in 70mL 25wt% TBAOH solution, electrostatically adsorbed at room temperature and stirred for 18h, centrifuged, and the resulting solid component was washed with deionized water and freeze-dried at -45°C for 24h, To obtain the exfoliated MXene nanosheets; place 0.1g of the exfoliated MXene nanosheets in 100mL of deionized water, and sonicate for 120min under a protective atmosphere to obtain an exfoliated MXene nanosheet dispersion with a concentration of 1g / L;

[0071] (3) Mix the 1g / L exfoliated MXene nanosheet dispersion and 20g / L graphene oxide suspension (the mass ratio of exfoliated MXene nanosheets and graphene oxide is 1:1) at room temperature and under stirring conditions , self-assembly rea...

Embodiment 2

[0078] Prepare MXene / graphene composite nanosheet according to the method for embodiment 1, and the difference with embodiment 1 is, the concentration of stripping MXene nanosheet dispersion liquid is 2g / L in step (2); Stripping MXene nanosheet in step (3) The mass ratio to graphene oxide is 1:2.

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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-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/587H01M4/62H01M10/0525B01J27/22B01J27/24B01J35/00H01G11/36H01G11/50H01G11/86
CPCH01M4/587H01M4/625H01M4/58H01M10/0525H01G11/36H01G11/50H01G11/86B01J27/22B01J27/24B01J35/33Y02E60/10
Inventor 张熊马衍伟王磊易莎
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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