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Preparation method of sheet-like cobalt sulfide composite flexible carbon cloth electrode material

A carbon cloth electrode, cobalt sulfide technology, applied in the field of electrochemistry, can solve the problems of poor rate performance, poor cycle performance, electrode pulverization, etc., and achieve the effects of excellent performance, low cost, and improved bonding strength

Inactive Publication Date: 2019-07-12
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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  • Preparation method of sheet-like cobalt sulfide composite flexible carbon cloth electrode material
  • Preparation method of sheet-like cobalt sulfide composite flexible carbon cloth electrode material
  • Preparation method of sheet-like cobalt sulfide composite flexible carbon cloth electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Mix isopropanol and glycerol at a volume ratio of 1:2 to obtain a mixed solution, take 1g of analytically pure cobalt nitrate hexahydrate and add it to 30ml of mixed solution to obtain solution A, take 0.6g of analytically pure sulfur Add acetamide to 10ml deionized water to obtain solution B;

[0032] 2) Mix solution A and solution B, and magnetically stir at a speed of 600r / min for 1h to form precursor solution C;

[0033] 3) Add 3 mg of CBTA to solution C, and then ultrasonically disperse for 1 hour to obtain solution D;

[0034] 4) Take 3*4cm square carbon cloth as anode, graphite plate as cathode, 40g / L ammonium dihydrogen phosphate aqueous solution as electrolyte, oxidize at 5V for 2min, and then alternately wash with ultrapure water and ethanol for 3 After drying in the oven;

[0035] 5) Soak the pretreated carbon cloth completely into the solution D, put the solution D and the carbon cloth into the hydrothermal reaction kettle according to the filling ratio...

Embodiment 2

[0041] 1) Mix isopropanol and glycerol at a volume ratio of 1:2 to obtain a mixed solution, take 1.3g of analytically pure cobalt nitrate hexahydrate and add it to 35ml of mixed solution to obtain solution A, take 0.8g of analytically pure cobalt nitrate hexahydrate Thioacetamide was added to 15ml deionized water to obtain solution B;

[0042] 2) Mix solution A and solution B, and magnetically stir at a speed of 650r / min for 2h to form precursor solution C;

[0043] 3) Add 4.5 mg of CBTA to solution C, and then ultrasonically disperse for 2 hours to obtain solution D;

[0044] 4) Take a 3*4cm square carbon cloth as the anode, a graphite plate as the cathode, and a 45g / L ammonium dihydrogen phosphate aqueous solution as the electrolyte, oxidize it at 5V for 2min, and then wash it alternately with ultrapure water and ethanol for 5 After drying in the oven;

[0045] 5) Soak the pretreated carbon cloth completely into the solution D, put the solution D and the carbon cloth into ...

Embodiment 3

[0048] 1) Mix isopropanol and glycerol at a volume ratio of 1:2 to obtain a mixed solution, take 1.5g of analytically pure cobalt nitrate hexahydrate and add it to 40ml of mixed solution to obtain solution A, take 1g of analytically pure sulfur Add acetamide to 20ml deionized water to obtain solution B;

[0049] 2) Mix solution A and solution B, and magnetically stir at a speed of 700r / min for 2.5h to form precursor solution C;

[0050] 3) Add 6 mg of CBTA to solution C, and then ultrasonically disperse for 3 hours to obtain solution D;

[0051] 4) Take a 3*4cm square carbon cloth as the anode, a graphite plate as the cathode, and a 50g / L ammonium dihydrogen phosphate aqueous solution as the electrolyte, oxidize it at 5V for 2min, and then alternately wash it with ultrapure water and ethanol for 6 After drying in the oven;

[0052] 5) Soak the pretreated carbon cloth completely into the solution D, put the solution D and the carbon cloth into the hydrothermal reaction kettle...

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Abstract

The invention relates to a preparation method of a sheet-like cobalt sulfide composite flexible carbon cloth electrode material. The method comprises the steps of: adding analytically pure cobalt nitrate hexahydrate into a mixed solution of isopropanol and glycerol to obtain a solution A; adding analytically pure thioacetamide into deionized water to obtain a solution B; mixing the solution A andthe solution B to obtain a precursor solution C; adding CBTA into the solution C to obtain a solution D; performing anodic oxidation pretreatment on the carbon cloth; and completely soaking the pretreated carbon cloth into the solution D, putting the solution D and the carbon cloth into a hydrothermal reaction kettle for hydrothermal reaction, and taking out the carbon cloth for cleaning and freeze-drying to obtain the sheet-like cobalt sulfide composite flexible carbon cloth electrode material. The carbon fibers can form a conductive framework network to increase the contact area with an electrolyte and provide growth attachment points and buffer volume expansion space for active materials. The sheet-like cobalt sulfide composite flexible carbon cloth electrode material has a good electrochemical performance.

Description

technical field [0001] The invention belongs to the field of electrochemistry and relates to the preparation of a negative electrode material of a sodium ion battery, and in particular relates to a preparation method of a sheet-like cobalt sulfide composite flexible carbon cloth electrode material. Background technique [0002] 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 process makes the rate perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/362H01M4/5815H01M4/625H01M4/628H01M10/054Y02E60/10
Inventor 黄剑锋何枢薇李嘉胤曹丽云李文斌徐光辉卜凡璐马闯
Owner SHAANXI UNIV OF SCI & TECH
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