Flower type Ni<3>S<2>/graphene three-dimensional composite electrode material and preparation method thereof

Abstract

The invention discloses a flower type Ni<3>S<2> / graphene three-dimensional composite electrode material and a preparation method thereof. In the flower type Ni<3>S<2> / graphene three-dimensional composite electrode material, graphene is taken as a substrate, and flower type Ni<3>S<2> particles are uniformly grown on the surface of the graphene. The preparation method of the flower type Ni<3>S<2> / graphene three-dimensional composite electrode material comprises the following steps of uniformly dispersing the graphene, thiourea, nickel acetate tetrahydrate and a three-block polymer F127 in distilled water with ultrasound; carrying out hydrothermal reaction on the obtained solution at 160-200 DEG C; dialyzing the gel-like mixture in the distilled water and then drying the gel-like mixture; and calcining the obtained gel-like solid at a controlled temperature of 750-850 DEG C under the protection of N2, thereby obtaining the black gel-like flower type Ni<3>S<2> / graphene three-dimensional composite electrode material which has high specific capacitance, charging and discharging stability, favorable conductivity and large specific surface area. The flower type Ni<3>S<2> / graphene three-dimensional composite electrode material can be used as an electrode material of a supercapacitor, and the preparation process is simple, and is convenience in operation and high in repeatability.

Description

Technical field [0001] The present invention belongs to the field of supercapacitors material synthesis technology, involving a flower type NI 3 S 2 / Graphene three -dimensional composite electrode materials and their preparation methods. Background technique [0002] Super capacitors, also known as electrochemical capacitors, dual -electrocarcons, are a energy storage device that is a kind of energy storage device that is traditional capacitance and traditional battery.The characteristics of low, high circulation efficiency and high output power are a good power supplement, which can be used well on many power devices.In the future development of energy storage devices of the United States, the US Department of Energy places super capacitors and batteries in the same important position Depending on the principle of energy storage, and supercapacitors can be divided into dual -electrocarcons and capacitor capacitors.Traditional supercapacitors electrode materials mainly include m...

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Problems solved by technology

[0005] One of purpose of the present invention is to solve above-mentioned Ni 3 S 2 Provide a flower-shaped Ni for technical problems such as easy agglomeration and low conductivity 3 S 2 / Graphene three-dimensional composite electrode material, the flower-shaped Ni 3 S 2 / Graphene three-dimensional composite electrode material has a large specific surface area and electrical conductivity. When used as a capacitor electrode material, it has high capacitance and charge-discharge stability, and can be used as a supercapacitor electrode material.

Graphene and Ni 3 S 2 Composite, on the one hand solves Ni 3 S 2 The problem of insufficient conductivity and easy agglomeration; on the other hand, by loading Ni on the surface of graphene 3 S 2 , which alleviates the problem of easy agglomeration and stacking of graphene in the process of hydrothermal preparation

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