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A preparation method and application of carbon-coated cobalt sulfide/cobalt octasulfide nine-cobalt nanoparticles with multi-level hole structure

A nanoparticle, carbon coating technology, applied in nanotechnology, structural parts, nanotechnology and other directions, can solve the problems of material capacity attenuation, material shedding and other problems, and achieve high utilization rate, large specific surface area, and controllable product morphology. Effect

Active Publication Date: 2020-04-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, the research on the energy storage mechanism of metal sulfides has mainly focused on the reversible conversion mechanism, namely: However, in practical applications, during the process of intercalation and deintercalation of metal sulfide anode materials, due to the continuous expansion and contraction of the volume, the powdering and shedding of the material are caused, and the capacity of the material decays rapidly during the cycle.

Method used

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  • A preparation method and application of carbon-coated cobalt sulfide/cobalt octasulfide nine-cobalt nanoparticles with multi-level hole structure
  • A preparation method and application of carbon-coated cobalt sulfide/cobalt octasulfide nine-cobalt nanoparticles with multi-level hole structure
  • A preparation method and application of carbon-coated cobalt sulfide/cobalt octasulfide nine-cobalt nanoparticles with multi-level hole structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Solution A: Dissolve cobalt acetate tetrahydrate in 3ml of DMF solution, the concentration of the solute is 0.3mol / L, the solution is kept at a constant temperature of 50°C in a water bath, then add 0.1g of PAN, and stir until the solution is uniform;

[0049] Solution B: Prepare 30ml of a mixed solution of glycerol and isopropanol at a ratio of 1:10 (v / v), stir and mix evenly;

[0050] Add solution A dropwise to solution B at a rate of 0.7mL / min. After the dropwise addition, continue stirring at a speed of 600rmp for 20min, then transfer to a 50ml solvothermal reaction kettle, and solvothermally heat at 180°C for 6h. The resulting product was centrifuged and washed several times with water and ethanol, and then dried at 60°C. According to the ratio of the amount of substance Sulfur source: Cobalt source (N (S) :N (C o ) )=5:1 add sulfur powder as a sulfur source, mix evenly with the dried product, place in a tube furnace to rise to 700°C with a heating rate of 3°C / m...

Embodiment 2

[0053] Solution A: Dissolve cobalt acetate tetrahydrate in 3ml of DMF solution, the concentration of the solute is 0.1mol / L, the solution is kept at a constant temperature of 50°C in a water bath, then add 0.06g of PAN, and stir until the solution is uniform;

[0054] Solution B: Prepare 30ml of a mixed solution of glycerol and isobutanol at a ratio of 1:5 (v / v), stir and mix evenly;

[0055] Add solution A dropwise to solution B at a rate of 0.6mL / min. After the dropwise addition, continue stirring at a speed of 600rmp for 20min, then transfer to a 50ml solvothermal reaction kettle, and solvothermally heat at 180°C for 3h. The resulting product was centrifuged and washed several times with water and ethanol, and then dried at 60°C. According to the ratio of the amount of substance N (S) :N (C o)=5:1 add sulfur powder as a sulfur source, mix it with the dried product evenly, put it in a tube furnace and raise it to 750°C at a rate of 5°C / min, the protective atmosphere is arg...

Embodiment 3

[0057] Solution A: Dissolve cobalt acetate tetrahydrate in 3ml of DMF solution, the concentration of the solute is 0.2mol / L, the solution is kept at a constant temperature of 50°C in a water bath, then add 0.2g of PAN, and stir until the solution is uniform;

[0058] Solution B: Prepare 30ml of a mixed solution of glycerol and ethanol at a ratio of 1:10 (v / v), stir and mix evenly;

[0059] Add solution A dropwise to solution B at a rate of 0.7mL / min. After the dropwise addition, continue stirring at a speed of 600rmp for 20min, then transfer to a 50ml solvothermal reaction kettle, and solvothermally heat at 180°C for 6h. The resulting product was centrifuged and washed several times with water and ethanol, and then dried at 60°C. According to the ratio of the amount of substance N (S) :N (C o ) =3:1 add sulfur powder as sulfur source, mix with the dried product evenly, place in a tube furnace at a heating rate of 3°C / min to 650°C, protect the atmosphere with argon, and obta...

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Abstract

The invention discloses a preparation method of carbon-coated cobaltous sulfide / cobaltous octosulfide nano particles having a multistage porous structure and an application thereof. Based on a solvothermal method, PAN is employed as a carbon source and is taken as a carrier of an active substance, the carbon-coated CoS / Co9S8 nano particles having a specific structure is obtained by adding a certain mass of sulfur powder through calcining and sulfuration under protection atmosphere, and the carbon-coated CoS / Co9S8 nano particles have the multistage porous structure. The multistage porous structure constructed by the carbon-coated active substance particles is in favor of full contacting of an electrolyte and an active substance, provides more reaction active sites, shortens diffusion distance of lithium ions, increases the multiplying power performance of a battery, alleviates volume expansion during a lithium insertion process, prevents powdering and shedding of the active substance, and greatly increases the cycle life of the battery. The preparation method has the advantages of easy operation, and controllable reaction condition, and is easy for an amplification experiment.

Description

technical field [0001] The invention belongs to the technical field of preparation of negative electrode materials for lithium ion batteries, in particular to a carbon-coated CoS / Co with a multi-level hole structure. 9 S 8 Preparation methods of nanoparticles and their application in lithium-ion batteries. Background technique [0002] Lithium-ion battery (LIB), with its high energy density and long cycle life, has become one of the most widely used energy storage systems, such as various handheld electronic devices, electric bicycles, electric vehicles, etc. Compared with handheld electronic devices, such as mobile phones and computers, electric vehicles need to significantly improve the performance of lithium-ion batteries in various aspects, such as achieving higher energy density (up to 500Wh / Kg in 2030), better safety and lower cost. Although graphite is the most commercially successful anode material, it still has problems such as low theoretical capacity and potenti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5815H01M4/587H01M10/0525Y02E60/10
Inventor 潘安强尹波
Owner CENT SOUTH UNIV
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