A kind of electrostatic self-assembly three-dimensional flower-like cobalt disulfide/mxene composite material and its preparation method and application

Abstract

The invention discloses an electrostatic self-assembled three-dimensional flower-shaped cobalt disulfide / MXene composite material and its preparation method and application. The composite material is a mixed solution obtained by stirring a soluble cobalt salt aqueous solution and a vulcanizing agent aqueous solution at 150-280°C. Carry out hydrothermal reaction, then carry out suction filtration after cooling with the furnace, and obtain solid A after drying; add solid A to polydiallyl dimethyl ammonium chloride solution and stir, wash to obtain solid B; put solid B into Stir in the MXene aqueous solution and let it stand, then centrifuge and wash and then freeze-dry to obtain solid C; under the protection of nitrogen, solid C is calcined at 500-700°C to obtain it. The invention is self-assembled on the MXene nanosheet matrix through electrostatic interaction, and the matrix can effectively accommodate the volume effect of cobalt disulfide in the charge and discharge process, and the composite material has excellent charge and discharge cycle performance, rate performance and high first Coulomb efficiency.

Description

An electrostatic self-assembled three-dimensional flower-like cobalt disulfide / MXene composite and its preparation methods and applications technical field The invention belongs to lithium ion battery negative electrode material technical field, more specifically, relate to a kind of electrostatic self-assembly three-dimensional Flower-like cobalt disulfide / MXene composite material and preparation method and application thereof. Background technique [0002] With the progress and development of society, the energy problems faced by human beings have become increasingly prominent. Lithium-ion batteries, as currently The most successful commercial energy storage device has alleviated some of the concerns about energy storage popular among people. In particular, due to the advantages of green / environmental protection and recyclability of lithium-ion batteries, they are widely used in electric vehicles. domain has been widely developed and applied. At present, the ano...

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Problems solved by technology

In particular, there is no patent report so far that the electrostatic self-assembly of three-dimensional flower-like cobalt disulfide on MXene nanosheets to form a composite material with a 3D structure, in addition to the excellent performance exhibited on lithium-ion battery anode materials, in other fields (sodium Ion batteries / catalytic ORE, etc.) will also be favored by scientists

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