Nickel disulfide carbon nano composite material and preparation method and application thereof

Abstract

The invention relates to a nickel disulfide carbon nano composite material and a preparation method and an application thereof, wherein the composite material is formed by coating a nickel disulfide nanosheet with a carbon layer. The preparation method comprises the following steps of preparing a nickel hydroxide nanosheet precursor by a hydrothermal method, performing magnetic stirring and dispersing in deionized water to obtain a uniform dispersion liquid of the nickel hydroxide nanosheet precursor, adding a buffering agent tris(hydroxymethyl) aminomethane hydrochloride, and adjusting the pHvalue to be 8.5 by adopting an alkali solution with the pH value of 13, adding dopamine hydrochloride, and magnetically stirring at room temperature for in-situ polymerization, and carrying out washing and centrifugally drying to obtain a nickel hydroxide nanosheet precursor/polydopamine composite material, and carrying out heat treatment and vulcanization with sublimed sulfur powder in a tubularfurnace in nitrogen atmosphere at a certain temperature to obtain the composite material. The preparation process is simple, easy to operate, green and non-toxic and friendly in material preparationprocess; and the prepared nickel disulfide carbon nano composite material is stable in structure, uniform in morphology and high in dispersion. The obtained nickel disulfide carbon nano composite material can be an ideal electrode material of a high-performance lithium ion battery, a supercapacitor and other new energy devices.

Description

technical field [0001] The invention belongs to the field of transition metal sulfide carbon composite material and its preparation, in particular to a nickel disulfide carbon nanocomposite material and its preparation method and application. Background technique [0002] The rapid development of modern technology has caused a serious shortage of traditional energy materials such as coal, oil, and natural gas. Finding clean and renewable energy materials and applying efficient energy storage and conversion equipment has become an urgent problem to be solved. Traditional energy conversion devices such as lithium-ion batteries, supercapacitors, and solar cells can convert materials into the energy we need with maximum efficiency, provided that a very suitable electrode material is found. Generally speaking, there are three main categories of anode materials for lithium-ion batteries: carbon materials, conductive polymers, and transition metal sulfides. Because transition meta...

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Problems solved by technology

However, transition metal sulfides usually exist in the form of nanoparticles or nanosheets, and they are prone to structural collapse or particle agglomeration during long-term charging and discharging, which affects their final electrochemical performance.

[0003] In addition, the conductivity of transition metal sulfide itself is not particularly excellent, which also has a great impact on its electrochemical performance. At present, most methods are to prepare transition metal sulfides with different morphologies and structures and their composites with carbonaceous materials. However, most of them are simply irregular composites prepared with graphene, carbon nanotubes, hydrothermal carbon, etc., and the preparation of sulfide carbon core-shell composites with regular and uniform morphology is still a big challenge.

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