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Preparation method of CoS/Co9S8@C core-shell structure nano composite sodium ion battery negative electrode material

A sodium-ion battery, nanocomposite technology, applied in battery electrodes, negative electrodes, nanotechnology and other directions, can solve the problems of loss of electrochemical activity, poor conductivity of cobalt sulfide, volume expansion, etc., to inhibit the collapse of material structure and enhance conductivity. , Environmentally friendly effect

Inactive Publication Date: 2021-04-09
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, cobalt sulfide has poor conductivity, and its conversion reaction during charging and discharging can easily cause volume expansion, causing the structure of the material to collapse, causing the material to pulverize and lose electrochemical activity.
Invention patent CN 110010875 discloses a method for preparing a thin-layer cobalt sulfide composite carbon cloth flexible electrode material. The cobalt sulfide material and carbon cloth are composited by hydrothermal heat. Although the conductivity of the material is improved, the thin-layer cobalt sulfide nanomaterial grows On the surface of carbon cloth, volume expansion inevitably occurs during charging and discharging, resulting in unstable electrochemical performance.

Method used

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  • Preparation method of CoS/Co9S8@C core-shell structure nano composite sodium ion battery negative electrode material
  • Preparation method of CoS/Co9S8@C core-shell structure nano composite sodium ion battery negative electrode material
  • Preparation method of CoS/Co9S8@C core-shell structure nano composite sodium ion battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Co-N / C precursor synthesis process:

[0026] First, respectively dissolve cobalt nitrate hexahydrate and 2-methylimidazole in 20ml of methanol solution to obtain purple solution A and transparent colorless solution B. Mix and stir the two solutions of A and B for 30 minutes, let them stand overnight, and depressurize The purple solid was obtained by suction filtration, which was dried in a blast oven at 60°C for 12 hours, and the dried ZIF-67 was heated at 5°C·min under an argon atmosphere. -1 The heating rate was maintained at 500 °C for 1 h to obtain a Co-N / C precursor.

[0027] 2) Hydrothermal process: Add the Co-N / C precursor and thioacetamide at a mass ratio of 1:2 to 30ml of water and stir to dissolve, then transfer the mixed solution to a reactor for 3 hours at 180°C, and centrifuge , and dried in a blast oven at 60°C for 12 hours to obtain cobalt sulfide.

[0028] 3) Carbon coating process: Dissolve cobalt sulfide in 200ml Tris-HCl buffer solution with pH =...

Embodiment 2

[0033] 1) Co-N / C precursor synthesis process:

[0034] First, respectively dissolve cobalt nitrate hexahydrate and 2-methylimidazole in 20ml of methanol solution to obtain purple solution A and transparent colorless solution B. Mix and stir the two solutions of A and B for 30 minutes, let them stand overnight, and depressurize The purple solid was obtained by suction filtration, which was dried in a blast oven at 60°C for 12 hours, and the dried ZIF-67 was heated at 5°C·min under an argon atmosphere. -1 The heating rate was maintained at 500 °C for 1 h to obtain a Co-N / C precursor.

[0035]2) Hydrothermal process: Add the Co-N / C precursor and thioacetamide at a mass ratio of 1:2 to 30ml of water and stir to dissolve, then transfer the mixed solution to a reactor for 3 hours at 180°C, and centrifuge , and dried in a blast oven at 60°C for 12 hours to obtain cobalt sulfide.

[0036] 3) Carbon coating process: Dissolve cobalt sulfide in 200ml Tris-HCl buffer solution with pH = ...

Embodiment 3

[0040] 1) Co-N / C precursor synthesis process:

[0041] First, respectively dissolve cobalt nitrate hexahydrate and 2-methylimidazole in 20ml of methanol solution to obtain purple solution A and transparent colorless solution B. Mix and stir the two solutions of A and B for 30 minutes, let them stand overnight, and depressurize The purple solid was obtained by suction filtration, which was dried in a blast oven at 60°C for 12 hours, and the dried ZIF-67 was heated at 5°C·min under an argon atmosphere. -1 The heating rate was maintained at 500 °C for 1 h to obtain a Co-N / C precursor.

[0042] 2) Hydrothermal process: Add the Co-N / C precursor and thioacetamide at a mass ratio of 1:2 to 30ml of water and stir to dissolve, then transfer the mixed solution to a reactor for 3 hours at 180°C, and centrifuge , and dried in a blast oven at 60°C for 12 hours to obtain cobalt sulfide.

[0043] 3) Carbon coating process: Dissolve cobalt sulfide in 200ml Tris-HCl buffer solution with pH =...

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Abstract

The invention belongs to the field of battery electrode materials, and discloses a preparation method of a CoS / Co9S8@C core-shell structure nano composite sodium ion battery negative electrode material, which takes ZIF-67 of a positive dodecahedron as a precursor and utilizes a nitrogen-containing carbon material to coat cobalt sulfide to form a carbon-coated positive dodecahedron CoS / Co9S8@C core-shell structure. The prepared CoS / Co9S8@C core-shell structure nano composite material is used as a negative electrode of a sodium ion battery, shows good sodium storage performance and stable cycle performance, and is a sodium ion negative electrode material which is low in price, simple, easy to obtain and environment-friendly.

Description

technical field [0001] The invention belongs to the field of battery electrode materials and relates to a CoS / Co 9 S 8 Preparation method of @C core-shell structure nanocomposite sodium ion battery anode material. Background technique [0002] With the rapid development of science and technology, fossil energy can no longer meet people's requirements for greener and safer new energy sources. Lithium-ion batteries have been a research hotspot since the 1880s and have been successfully commercialized on a large scale. With the popularization of pure electric vehicles and hybrid vehicles, the demand for lithium has been greatly increased, and the content of lithium ore in the earth's crust is only about 0.0065%. Obviously, this cannot fully meet people's future requirements for lithium, and sodium , has similar physical and chemical properties to lithium, and at the same time is rich in resources, low in price, green and safe, these advantages will greatly promote the possibi...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/58H01M10/054B82Y30/00B82Y40/00
CPCH01M4/5815H01M4/625H01M4/628H01M10/054B82Y30/00B82Y40/00H01M2004/027H01M2004/021Y02E60/10
Inventor 邱静霞余功勋祁莹丁华瑞
Owner JIANGSU UNIV
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