N-doped carbon-coated cobalt-nickel sulfide/graphene composite electrode material

A cobalt-nickel sulfide and graphene composite technology, applied in hybrid capacitor electrodes, battery electrodes, circuits, etc., can solve the problems of poor cycle stability, low specific capacity, high specific capacity, etc., and achieve excellent rate performance and cycle stability high specific capacitance, simple preparation process

Inactive Publication Date: 2018-05-25
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance of supercapacitors is closely related to the electrode materials used. The three commonly used electrode materials (carbon materials, metal oxides/hydroxides, and conductive polymers) have their own advantages and disadvantages:

Method used

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  • N-doped carbon-coated cobalt-nickel sulfide/graphene composite electrode material
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  • N-doped carbon-coated cobalt-nickel sulfide/graphene composite electrode material

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Experimental program
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Effect test

Embodiment 1

[0024] A preparation method of nitrogen-doped carbon-coated cobalt-nickel sulfide / graphene composite electrode material, the specific steps are:

[0025] (1) Weigh 10 mg of graphene oxide (GO, self-made) and add it to 50 mL of ethylene glycol, and disperse ultrasonically for 30 minutes to make GO uniformly dispersed in ethylene glycol;

[0026] (2) Weigh 0.3 g of polyvinylpyrrolidone (PVP), 125 mg of cobalt acetate tetrahydrate (Co(CH 3 COO) 2 4H 2 O) and 124 mg of nickel acetate tetrahydrate (Ni(CH 3 COO) 2 4H 2 O) Add it to the solution in step (1), dissolve it fully by ultrasonication, then transfer the above mixed solution to a round bottom flask and place it on an oil bath at 150°C for 5 hours in an oil bath. Finally, after it is naturally cooled to room temperature, it is centrifuged and washed with absolute ethanol for 4-5 times, and the washed product is dried in an electric blast drying oven;

[0027] (3) Weigh 15 mg of the centrifuged-dried product in step (2) ...

Embodiment 2

[0029] A preparation method of nitrogen-doped carbon-coated cobalt-nickel sulfide / graphene composite electrode material, the specific steps are:

[0030] (1) Weigh 5 mg of graphene oxide (GO, self-made) and add it to 30 mL of ethylene glycol, and ultrasonically disperse for 30 minutes to make GO uniformly dispersed in ethylene glycol;

[0031] (2) Weigh 0.5 g of polyvinylpyrrolidone (PVP), 250 mg of cobalt acetate tetrahydrate (Co(CH 3 COO) 2 4H 2 O) and 250 mg of nickel acetate tetrahydrate (Ni(CH 3 COO) 2 4H 2 O) Add it to the solution in step (1), dissolve it fully by ultrasonication, then transfer the above mixture to a round bottom flask and place it on an oil bath at 250°C for 1 hour in an oil bath. Finally, after it is naturally cooled to room temperature, it is centrifuged and washed with absolute ethanol for 4-5 times, and the washed product is dried in an electric blast drying oven;

[0032] (3) Weigh 30 mg of the centrifuged-dried product of step (2) and 50 mg...

Embodiment 3

[0034] A preparation method of nitrogen-doped carbon-coated cobalt-nickel sulfide / graphene composite electrode material, the specific steps are:

[0035] (1) Weigh 20 mg of graphene oxide (GO, self-made) and add it to 100 mL of ethylene glycol, and ultrasonically disperse for 30 minutes to make GO uniformly dispersed in ethylene glycol;

[0036] (2) Weigh 0.1 g of polyvinylpyrrolidone (PVP), 60 mg of cobalt acetate tetrahydrate (Co(CH 3 COO) 2 4H 2 O) and 70 mg of nickel acetate tetrahydrate (Ni(CH 3 COO) 2 4H 2 O) Add it to the solution in step (1), dissolve it fully by ultrasonication, then transfer the above mixture to a round bottom flask and place it on an oil bath at 200°C for 1 hour in an oil bath. Finally, after it is naturally cooled to room temperature, it is centrifuged and washed with absolute ethanol for 4-5 times, and the washed product is dried in an electric blast drying oven;

[0037](3) Weigh 5 mg of the centrifuged-dried product in step (2) and 10 mg o...

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Abstract

The invention discloses an N-doped carbon-coated cobalt-nickel sulfide/graphene composite electrode material and a preparation method thereof, belonging to the field of preparation of an electrode material for super capacitors. The preparation method comprises the following processes: adding graphene oxide (GO) into an ethylene glycol solution, and performing ultrasonic dispersion to enable the GOto be uniformly dispersed in the ethylene glycol solution; adding polyvinylpyrrolidone (PVP), cobaltous acetate tetrahydrate and nickel acetate into a GO dispersion solution prepared above, after ultrasonic dispersion and dissolution, transferring to a round bottom flask to perform oil bath reaction and performing centrifugal washing and drying; enabling a product, which is dried via centrifugalwashing after oil bath, to calcine with thiourea to obtain the N-doped carbon-coated cobalt-nickel sulfide/graphene composite electrode material. According to the prepared electrode material, N-dopedcarbon is coated outside cobalt-nickel sulfide particles which have uniform sizes in microstructure, the electrode material is uniformly loaded on the substrate of graphene, and meanwhile, the electrode material has relatively high specific capacitance, excellent rate capability and cycling stability.

Description

technical field [0001] The invention belongs to the field of preparation of electrode materials for supercapacitors, in particular to a nitrogen-doped carbon-coated cobalt-nickel sulfide / graphene composite electrode material and a preparation method thereof. Background technique [0002] Supercapacitors can be used in energy storage devices, power Power systems and many electronic devices have attracted extensive attention from industry and academia. The performance of supercapacitors is closely related to the electrode materials used. The three commonly used electrode materials (carbon materials, metal oxides / hydroxides, and conductive polymers) have their own advantages and disadvantages: the production process of carbon materials is simple, low in price, and recyclable. Good performance, but low specific capacity; metal oxides / hydroxides and conductive polymers have high specific capacity, but high cost and poor cycle stability. Studies have shown that the combination o...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01G11/32
CPCH01G11/32H01M4/362Y02E60/10Y02E60/13
Inventor 陈奇俤苗晋康蔡道平詹红兵
Owner FUZHOU UNIV
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