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Preparation method of cobalt-based bimetallic sulfide negative electrode material and application thereof

A negative electrode material and bimetal technology, which is applied to the preparation field of negative electrode material cobalt nickel sulfide, can solve the problems of low energy density of capacitors and the like, and achieve the effect of improving electrochemical performance.

Active Publication Date: 2019-04-26
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a supercapacitor anode material with a simple preparation method and high specific capacity and a preparation method thereof. The present invention prepares an M-Co-S electrode material that can be used as an asymmetric supercapacitor anode, The maximum specific capacitance can be as high as 1625F / g, which is 8~16 times that of traditional activated carbon anode materials (100~200F / g). It is expected to become a new supercapacitor anode material to overcome the defects of low energy density of traditional capacitors.

Method used

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  • Preparation method of cobalt-based bimetallic sulfide negative electrode material and application thereof
  • Preparation method of cobalt-based bimetallic sulfide negative electrode material and application thereof
  • Preparation method of cobalt-based bimetallic sulfide negative electrode material and application thereof

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Effect test

Embodiment 1

[0033] Step 1: Put the cleaned nickel foam in the center of the high temperature diffusion furnace. Before heating, argon gas with a flow rate of 100 sccm was introduced for 30 minutes to remove the air, and then the temperature in the furnace was rapidly increased to 1000 °C at a rate of 10 °C / min. At this time, hydrogen gas was introduced with a flow rate of 50 sccm to maintain After 30 minutes, methane is introduced, the flow rate of methane is 5 sccm, the time of methane is 4 minutes, methane and hydrogen are turned off at the same time after 4 minutes, and the temperature in the furnace is lowered to room temperature under an argon atmosphere, and graphene on the surface can be obtained. layer of nickel foam.

[0034] Step 2: Weigh 1mmol of ferric nitrate and 1mol of nickel nitrate and dissolve in 35mL of deionized water, stir for 10min to obtain a transparent solution, add 4mmol of hexamethylenetetramine and 2mmol of ammonium fluoride under magnetic stirring to dissolve ...

Embodiment 2

[0038] Compared with embodiment 1, embodiment 2 replaces nickel nitrate with ferric nitrate, and all the other are identical with embodiment 1, figure 2 The electrochemical performance of the sample obtained for Example 2.

Embodiment 3

[0040] Compared with embodiment 1, embodiment 3 replaces nickel nitrate with ammonium molybdate, and all the other are identical with embodiment 1, image 3 The electrochemical performance of the sample obtained for Example 3.

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Abstract

The invention discloses a preparation method of a cobalt-based bimetallic sulfide negative electrode material (M-Co-S, M = Ni, Fe, Mo, Bi, Zn) and application of the cobalt-based bimetallic sulfide negative electrode material in a water system supercapacitor. Foamed nickel with graphene on the surface is used as a substrate, cobalt salt is used as a cobalt source, M salt is used as an M source, ammonium fluoride and hexamethyltetramine are used as precipitators, sodium sulfide is used as a vulcanizing agent, an M-Co-S film is obtained through a two-step hydrothermal method, and the M-Co-S is uniformly coated on the surface of the foamed nickel substrate with the graphene. The prepared M-Co-S material is assembled into a three-electrode system, electrochemical performance evaluation is conducted in a 1M KOH electrolyte, the maximum specific capacitance of the M-Co-S material is up to 2.6 F / cm<2> (1625 F / g) and higher than that of common negative electrode materials, and the M-Co-S is asupercapacitor negative electrode material with great application prospects.

Description

technical field [0001] The invention belongs to the field of water-based supercapacitors, and in particular relates to a preparation method of cobalt-nickel sulfide, a negative electrode material. Background technique [0002] Supercapacitors have the advantages of high power, long cycle life, and environmental protection, and play an irreplaceable role in the field of electrochemical energy storage. However, the low energy density has always been the fatal flaw of supercapacitors, hindering their large-scale industrialization. According to the energy density (E) calculation formula E=0.5CV 2 , the energy density can be improved by increasing the specific capacitance (C) and operating voltage (V) of the capacitor. In recent years, the use of pseudocapacitive materials with high specific capacity (10-100 times the specific capacity of traditional carbon materials) as the positive electrode and carbon materials as the negative electrode to construct aqueous asymmetric superc...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/30H01G11/36H01G11/68
CPCH01G11/30H01G11/36H01G11/68H01G11/86Y02E60/13
Inventor 肖婷车鹏程谭新玉向鹏姜礼华
Owner CHINA THREE GORGES UNIV
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