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

The invention discloses a flower type Ni S /graphene three-dimensional composite electrode material and a preparation method thereof. In the flower type Ni S /graphene three-dimensional composite electrode material, graphene is taken as a substrate, and flower type Ni S particles are uniformly grown on the surface of the graphene. The preparation method of the flower type Ni S /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 S /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 S /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.