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Ultra-small cobalt sulfide nanosheet/carbon cloth composite material and preparation method thereof

A composite material, cobalt sulfide technology, applied in the field of electrochemistry, can solve problems such as poor cycle performance, electrode pulverization, and poor rate performance, and achieve the effects of low cost, improved conductivity, and increased capacity contribution

Pending Publication Date: 2021-07-16
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cobalt sulfide belongs to the transition metal sulfide, which belongs to the negative electrode material of the conversion reaction type in the secondary battery, but due to the large volume expansion, its cycle performance is poor, causing electrode pulverization; the slower kinetic process makes the rate performance slower. Difference

Method used

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  • Ultra-small cobalt sulfide nanosheet/carbon cloth composite material and preparation method thereof
  • Ultra-small cobalt sulfide nanosheet/carbon cloth composite material and preparation method thereof
  • Ultra-small cobalt sulfide nanosheet/carbon cloth composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Take a certain amount of analytically pure cobalt acetate, tetrahydrate and sulfur powder and join together in the ethanol solution, and stir to obtain a clear solution A. The concentration of cobalt acetate is 0.15mol / L, and the mass ratio of cobalt acetate and sulfur powder is 1:0.7;

[0027] 2) Put the clear solution A at room temperature and avoid light for 4 hours, perform suction filtration, collect the powder and wash it alternately with deionized water and absolute ethanol for 3-5 times, and dry it in a vacuum drying oven at 70°C for 5 hours. Obtain powder A;

[0028] 3) Cut the carbon cloth into a size of 2cm*3cm, completely soak it in concentrated nitric acid solution, and react it in an oven at 90°C for 2 hours. Handle carbon cloth;

[0029] 4) Place the pretreated carbon cloth and powder A at both ends of the magnetic state respectively, put them together into a tube furnace, and calcinate to 700°C under the protection of an argon atmosphere, with a hea...

Embodiment 2

[0031] 1) Take a certain amount of analytically pure cobalt acetate, tetrahydrate and sulfur powder and join together in the ethanol solution, and stir to obtain a clear solution A. The concentration of cobalt acetate is 0.18mol / L, and the mass ratio of cobalt acetate and sulfur powder is 1:0.9;

[0032] 2) Put the clear solution A at room temperature and avoid light for 5 hours, perform suction filtration, collect the powder and wash it alternately with deionized water and absolute ethanol for 3-5 times, and dry it in a vacuum oven at 70°C for 8 hours. Obtain powder A;

[0033] 3) Cut the carbon cloth into a size of 2cm*3cm, completely soak it in concentrated nitric acid solution, and react it in an oven at 90°C for 3 hours. Handle carbon cloth;

[0034] 4) Place the pretreated carbon cloth and powder A at both ends of the magnetic state respectively, put them together into a tube furnace, and calcinate to 750°C under the protection of argon atmosphere, with a heating rate ...

Embodiment 3

[0036] 1) Take a certain amount of analytically pure cobalt acetate, tetrahydrate and sulfur powder and join together in the ethanol solution, and stir to obtain a clear solution A. The concentration of cobalt acetate is 0.2mol / L, and the mass ratio of cobalt acetate and sulfur powder is 1:1.1;

[0037] 2) Put the clear solution A at room temperature and avoid light for 7 hours, perform suction filtration, collect the powder and wash it alternately with deionized water and absolute ethanol for 3-5 times, and dry it in a vacuum drying oven at 70°C for 10 hours. Obtain powder A;

[0038] 3) Cut the carbon cloth into a size of 2cm*3cm, completely soak it in concentrated nitric acid solution, and react it in an oven at 90°C for 4 hours. Handle carbon cloth;

[0039] 4) Place the pretreated carbon cloth and powder A at both ends of the magnetic state, put them together into a tube furnace, and calcinate to 800°C under the protection of an argon atmosphere, with a heating rate of ...

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Abstract

The invention discloses a preparation method of an ultra-small cobalt sulfide nanosheet / carbon cloth composite material. Thepreparation method comprises the following steps of: step 1, weighing analytically pure cobalt acetate and sulfur tetrahydrate powder according to a mass ratio of 1:(0.7-1.1), adding them into an ethanol solution, and stirring to obtain a solution A with the cobalt acetate concentration of 0.15-0.2 mol / L; 2, standing the solution A, performing suction filtration, collecting powder, cleaning and drying to obtain powder A; step 3, cutting carbon cloth into small blocks, completely soaking the small blocks in a concentrated nitric acid solution, reacting in a drying oven at 90 DEG C for 2-4 hours, cooling and cleaning to obtain pretreated carbon cloth; 4, placing the pretreated carbon cloth and the powder A at the two ends of a magnet respectively and placing them in a tubular furnace together, carrying out calcination under argon atmosphere protection to 700-800 DEG C at the heating rate of 3-7 DEG C / min, conducting heat preservation for 1-3 h, and after the temperature is reduced to the room temperature, taking out a sample, so that the ultra-small cobalt sulfide nanosheet / carbon cloth composite material is obtained. The electrochemical activity and the rate capability of the cobalt sulfide electrode material are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a negative electrode material of a sodium ion battery and a preparation method thereof, in particular to an ultra-small cobalt sulfide nanosheet / carbon cloth composite material and a preparation method thereof. [0002] technical background [0003] With the popularity of portable electronic products and the rapid development of electric vehicles, the requirements for energy storage technology are getting higher and higher. Carbon-based materials are widely used host materials in secondary batteries, such as carbon nanotubes, porous carbon, graphene, graphene nanobelts, carbon fibers, etc. Cobalt sulfide belongs to the transition metal sulfide, which belongs to the negative electrode material of the conversion reaction type in the secondary battery, but due to the large volume expansion, its cycle performance is poor, causing electrode pulverization; the slower kinetic proc...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/58H01M10/054B82Y30/00B82Y40/00
CPCH01M4/5815H01M4/625H01M10/054B82Y30/00B82Y40/00H01M2004/027H01M2004/021Y02E60/10
Inventor 黄剑锋何枢薇李嘉胤曹丽云王瑜航张金津
Owner SHAANXI UNIV OF SCI & TECH
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