Preparation method and application of MOFs derived cobalt sulfide particle composite carbon material

A particle composite and carbon material technology, applied in the field of electrochemical energy storage, can solve the problems of cobalt sulfide pulverization, electrochemical performance decline, volume expansion, etc., and achieve the effects of good dispersion, low raw material cost, and easy access

Inactive Publication Date: 2021-07-23
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in Na + During the repeated deintercalation process, cobalt sulfide often appears pulverized, causing a certain degree of volume expansion, which leads to a decrease in electrochemical performance.

Method used

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  • Preparation method and application of MOFs derived cobalt sulfide particle composite carbon material
  • Preparation method and application of MOFs derived cobalt sulfide particle composite carbon material
  • Preparation method and application of MOFs derived cobalt sulfide particle composite carbon material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Weigh 0.4g cobalt nitrate hexahydrate and 1.5g 2-methylimidium At the same time, add it to 50mL of deionized water, and stir until it is completely dissolved to obtain solution A;

[0035] 2) Put the carbon cloth into the acetone solution for 24 hours, and wash it alternately with deionized water and absolute ethanol for 3 times, and dry it in a vacuum oven at 60°C for 5 hours. The pretreated 3*3cm hydrophilic carbon cloth Soak in solution A, and let it stand at 40°C for 12 hours; after the reaction, wash the carbon cloth with deionized water and absolute ethanol alternately for 3 times, and dry it in a vacuum drying oven at 60°C for 5 hours to obtain carbon cloth A;

[0036] 3) Put carbon cloth A into a porcelain boat, and calcine in an argon atmosphere to obtain carbon cloth B; the calcination temperature is 480°C, the holding time is 0.5h, and the heating rate is 2°C / min;

[0037] 4) Dissolve a certain amount of thioacetamide in ethylene glycol, control the sulf...

Embodiment 2

[0040] 1) Weigh 0.6g cobalt nitrate hexahydrate and 1.8g 2-methylimidium At the same time, add it to 50mL of deionized water, and stir until it is completely dissolved to obtain solution A;

[0041] 2) Put the carbon cloth into the acetone solution for 32 hours, and wash it alternately with deionized water and absolute ethanol for 5 times, and dry it in a vacuum oven at 65°C for 8 hours. The pretreated 3*3cm hydrophilic carbon cloth Soak in solution A and let it stand at 50°C for 16 hours; after the reaction, wash the carbon cloth alternately with deionized water and absolute ethanol repeatedly, and dry it in a vacuum oven at 65°C for 8 hours to obtain carbon cloth A;

[0042] 3) Put carbon cloth A into a porcelain boat, and calcine it in an argon atmosphere to obtain carbon cloth B; the calcination temperature is 500°C, the holding time is 1.5h, and the heating rate is 4°C / min;

[0043] 4) Dissolve a certain amount of thioacetamide in ethylene glycol, control the sulfur sou...

Embodiment 3

[0046] 1) Weigh 0.8g cobalt nitrate hexahydrate and 2g 2-methylimidium At the same time, add it to 50mL of deionized water, and stir until it is completely dissolved to obtain solution A;

[0047] 2) Put the carbon cloth in the acetone solution for 36 hours, and wash it alternately with deionized water and absolute ethanol for 6 times, and dry it in a vacuum oven at 75°C for 12 hours. The pretreated 3*3cm hydrophilic carbon cloth Soak in solution A and let it stand at 55°C for 18 hours; after the reaction, wash the carbon cloth alternately with deionized water and absolute ethanol repeatedly, and dry it in a vacuum oven at 75°C for 12 hours to obtain carbon cloth A;

[0048] 3) Put carbon cloth A into a porcelain boat, and calcine it in an argon atmosphere to obtain carbon cloth B; the calcination temperature is 600°C, the holding time is 2h, and the heating rate is 5°C / min;

[0049] 4) Dissolve a certain amount of thioacetamide in ethylene glycol, control the sulfur source co...

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Abstract

The invention discloses a preparation method of an MOFs derived cobalt sulfide particle composite carbon material. The method comprises the following steps: 1, simultaneously adding 0.4-0.8 g of cobalt nitrate hexahydrate and 1.5-2g of 2-methylimidazole into 50mL of deionized water, and stirring till that the cobalt nitrate hexahydrate and the 2-methylimidazole are completely dissolved to obtain a solution A; 2, soaking pretreated 3 * 3cm hydrophilic carbon cloth in the solution A for standing, and then cleaning and drying to obtain carbon cloth A; 3, putting the carbon cloth A into a porcelain boat, introducing a gas in an inert gas atmosphere, and calcining to obtain carbon cloth B, wherein the temperature is 480-600 DEG C, heat preservation is performed for 0.5-2 h, and a heating rate is 2-5 DEG C / min; 4, dissolving a sulfur source in ethylene glycol, and adjusting the pH value to 10.5-11 to obtain a solution B with the sulfur source concentration of 0.25-0.42 mol / L; and 5, putting the carbon cloth B into the solution B, sealing, putting into a drying oven, reacting at 155-175 DEG C for 15-20 hours, and washing and drying after the reaction is finished. The cobalt sulfide particles in the prepared composite material are small in size, and the method has a high charge-discharge specific capacity and an excellent rate capability.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage and relates to composite electrode materials, in particular to a preparation method and application of MOFs-derived cobalt sulfide particle composite carbon materials. Background technique [0002] In the face of the rapid development of modern science and technology, it is particularly important to develop new and efficient green renewable energy storage systems. Among them, compared with lithium-ion batteries, sodium-ion batteries have certain advantages in cost, safety and storage resources, and have attracted much attention. Metal-organic frameworks (MOFs for short) refer to crystalline materials formed by self-assembly between metal ions and organic ligands through coordination bonds, which have the advantages of large specific surface area, ultra-high porosity, and diverse structures. Compared with electrode materials, it has great application value[G.Fang,J.Zhou,C.Liang,et al....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/054C01G51/00
CPCH01M4/366H01M4/587H01M4/5815H01M10/054C01G51/30H01M2004/027H01M2004/021C01P2002/72C01P2004/03C01P2002/82Y02E60/10
Inventor 黄剑锋何枢薇李嘉胤曹丽云张晓刘鑫悦郭鹏辉
Owner SHAANXI UNIV OF SCI & TECH
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