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Preparation method and application of a hollow spherical cobalt sulfide/graphene composite material

A composite material and graphene technology, applied in the field of composite materials, can solve the problems of cobalt sulfide easy to agglomerate theoretical specific capacity, serious volume expansion effect, unsuitable for lithium-ion batteries, etc., to reduce material and charge transfer paths, low cost, The effect of increasing and electronic conductivity

Active Publication Date: 2021-01-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the prepared electrode material still has poor electrical conductivity and serious volume expansion effect, which is not suitable for lithium-ion batteries.
[0007] CN108598427A discloses a method for coating and reducing graphene oxide to improve the charge-discharge cycle capability of cobalt sulfide. This invention has complex processes and many processes, and the prepared cobalt sulfide is easy to agglomerate, so that the theoretical specific capacity cannot be fully utilized.

Method used

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  • Preparation method and application of a hollow spherical cobalt sulfide/graphene composite material
  • Preparation method and application of a hollow spherical cobalt sulfide/graphene composite material
  • Preparation method and application of a hollow spherical cobalt sulfide/graphene composite material

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Effect test

Embodiment 1

[0045] (1) Add 0.375mmol (0.1091g) cobalt nitrate hexahydrate and 8mL glycerin to 40mL isopropanol, stir, hydrothermally react at 180°C for 6 hours, centrifuge at 6000rpm / min, and deionize the precipitate with deionized water and absolute ethanol Cross-washed 6 times respectively, and dried at 70°C to obtain the cobalt-glycerol complex;

[0046] (2) Add 2.5mL of 3-aminopropyltrimethoxysilane to 30mL of absolute ethanol solution containing 50mg of cobalt-glycerol complex, stir at 300r / min for 12h, ultrasonicate at 400W for 4h, and centrifuge at 6000rpm / min. Deionized water and absolute ethanol were cross-washed 5 times respectively to obtain 30 mL ethanol solution containing cobalt-glycerol complex;

[0047] (3) Add 15mg of graphene oxide into 20mL of absolute ethanol solution, and disperse with 400W ultrasonic for 2 hours to obtain a uniform and stable graphene oxide dispersion. / min stirring for 5h, 400W ultrasonic treatment for 4h, to obtain a uniform and stable mixed solut...

Embodiment 2

[0056] (1) Add 0.375mmol (0.1091g) cobalt nitrate hexahydrate and 16mL glycerin to 40mL isopropanol, stir, carry out hydrothermal reaction at 180°C for 4 hours, centrifuge at 6000rpm / min, and deionize the precipitate with deionized water and absolute ethanol Cross-washed 6 times respectively, and dried at 70°C to obtain the cobalt-glycerol complex;

[0057] (2) Add 2.5mL of 3-aminopropyltrimethoxysilane to 30mL of absolute ethanol solution containing 30mg of cobalt-glycerol complex, stir at 300r / min for 12h, ultrasonicate at 400W for 4h, and centrifuge at 6000rpm / min. Deionized water and absolute ethanol were cross-washed 5 times respectively to obtain 30 mL ethanol solution containing cobalt-glycerol complex;

[0058] (3) Add 10 mg of graphene oxide into 20 mL of absolute ethanol solution, and disperse with 400W ultrasonic for 2 hours to obtain a uniform and stable graphene oxide dispersion; Min stirring for 5 hours, 400W ultrasonic treatment for 4 hours, to obtain a uniform...

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Abstract

The invention discloses a preparation method and application of a hollow sphere cobalt sulfide / graphene composite material. The preparation method disclosed by the invention comprises the following steps: firstly, preparing a solid spherical cobalt-glycerol complex from glycerol and cobalt nitrate hexahydrate; then changing the surface electrical property by adopting a surface charge modifier; mixing with graphene and attaching to the surface of the graphene; and finally, adding thioamide to be subjected to a hydrothermal reaction with a cobalt-glycerol complex attached to the surface of graphene, performing vulcanization while cobalt diffusion is conducted, forming a hollow sphere structure on graphene in situ, and obtaining the cobalt sulfide / graphene composite material in a hollow sphere shape. The method is easy to operate and low in cost. The composite material prepared by the method disclosed by the invention is used for assembling a battery, so that the battery has excellent cycling stability and rate capability.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a preparation method and application of a hollow spherical cobalt sulfide / graphene composite material. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high power density, long cycle life, and non-toxicity, making them the premier power source choice for portable electronic devices and electric vehicles. However, the low theoretical specific capacity, low safety and poor rate performance of graphite-based anode materials commonly used in lithium-ion batteries limit the further application of graphite anodes, which can no longer meet people's needs for lithium-ion batteries. [0003] Compared with traditional graphite anodes, metal sulfides have higher reversible specific capacity, greater energy density and excellent safety performance, and are ideal materials for lithium-ion battery anode materials. However, when metal sulfides a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525
CPCH01M4/5815H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 郑俊超路士杰罗紫艳汪志腾贺振江
Owner CENT SOUTH UNIV
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