Electrostatic self-assembly three-dimensional flower-like cobalt disulfide/MXene composite material and preparation method and application thereof

Abstract

The invention discloses an electrostatic self-assembly three-dimensional flower-like cobalt disulfide / MXene composite material and a preparation method and application thereof. The composite materialis prepared by the following steps: stirring a soluble cobalt salt aqueous solution and a vulcanizing agent aqueous solution to obtain a mixed solution, carrying out hydrothermal reaction on the mixedsolution at 150-280 DEG C, performing cooling along with a furnace, carrying out suction filtration, and carrying out drying to obtain a solid A; adding the solid A into a polydiallyldimethylammoniumchloride solution, performing stirring, and performing washing to obtain a solid B; putting the solid B into an MXene aqueous solution, performing stirring, performing standing, carrying out centrifugal washing, and carrying out freeze drying to obtain a solid C; and under the protection of nitrogen, calcining the solid C at 500-700 DEG C to obtain the composite material. The composite material is self-assembled on an MXene nanosheet substrate through electrostatic interaction, the substrate can effectively accommodate the volume effect of cobalt disulfide in the charging and discharging process, and the composite material has excellent charging and discharging cycle performances, rate capability and high initial coulombic efficiency.

Description

technical field

[0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and more specifically relates to an electrostatic self-assembled three-dimensional flower-like cobalt disulfide / MXene composite material and its preparation method and application. Background technique

[0002] With the progress and development of society, the energy problems faced by human beings have become increasingly prominent. Lithium-ion battery, as the most successful commercial energy storage device at present, alleviates some of people's concerns about energy storage, so it has been favored by people from all walks of life. In particular, lithium-ion batteries have been widely developed and applied in the field of electric vehicles due to their green / environmental protection and recyclable advantages. At present, the negative electrode active materials used in lithium-ion batteries on the market are usually graphite materials with good con...

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