Cobalt disulfide nanocrystal / graphene composite electrode material and preparation method thereof

A graphene composite and cobalt disulfide technology, which is applied in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, nanotechnology, etc., can solve the problem of affecting catalytic characteristics and energy storage cycle stability, active sites cannot be fully exposed, Iron disulfide decomposition acceleration and other issues, to achieve the effect of improving electrochemical performance, high production efficiency, and uniform material distribution

Active Publication Date: 2018-10-16
创普斯(深圳)新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Cobalt disulfide has low resistivity, good catalytic activity and chemical stability, but it is prone to self-agglomeration, and the active sites cannot be fully exposed, which affects its catalytic properties and cycle stability of energy storage.
The biggest disadvantage of iron disulfide in thermal battery applications

Method used

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  • Cobalt disulfide nanocrystal / graphene composite electrode material and preparation method thereof
  • Cobalt disulfide nanocrystal / graphene composite electrode material and preparation method thereof
  • Cobalt disulfide nanocrystal / graphene composite electrode material and preparation method thereof

Examples

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Example Embodiment

[0035] Example 1

[0036] This embodiment relates to a method for preparing a cobalt disulfide nanocrystal / graphene composite electrode material, and an electrode material in which cobalt disulfide nanocrystal grains and graphene are composited with a size of 1-10 nanometers is prepared by vacuum low-temperature calcination. In the preparation method of the composite electrode material, cobalt disulfide nanocrystalline grains and single-layer graphene are composited. The graphene is a single layer of graphite, composed of carbon atoms arranged hexagonally, with high internal carrier mobility, good thermal conductivity, high specific surface area, and excellent mechanical strength. Due to the strong π-π interaction between graphene sheets, the sheets are easily re-stacked to form a graphite-like structure. Pure cobalt disulfide has low resistivity, good catalytic activity and chemical stability, but is prone to self-agglomeration, and the active sites cannot be fully exposed, ...

Example Embodiment

[0053] Preparation method embodiment one

[0054] The cobalt disulfide nanocrystal / graphene composite electrode material was prepared with the mass ratio of graphene oxide and cobalt dichloride as 3:1.

[0055] Anhydrous ethanol and polyvinyl alcohol are stirred and mixed uniformly in a volume ratio of 6:1 to obtain a mixed solution. Take 2 ml of mixed solution, then dissolve 0.04 g of cobalt dichloride in the mixed solution, stir evenly, and slowly add 10 ml of graphene oxide dropwise. For example, the concentration of graphene oxide is: 3 mg / ml. Ultrasonic stirring for 1 hour, static, centrifugation to collect the precipitate, washing with deionized water for several times, such as washing three times, and freeze-drying to obtain the composite precursor. Finally, the cobalt disulfide nanocrystal / graphene composite electrode material was obtained by holding the temperature at 350 °C for 0.5 hours in a vacuum environment of 40 Pascals.

[0056] The collected products were ad...

Example Embodiment

[0057] Preparation method embodiment two

[0058] The cobalt disulfide nanocrystal / graphene composite electrode material was prepared with a mass ratio of graphene oxide to cobalt dichloride of 5:1.

[0059] Anhydrous ethanol and polyvinyl alcohol were stirred and mixed uniformly at a volume ratio of 1:1, and 4 ml of the mixed solution was taken. Then 0.2 g of cobalt dichloride was dissolved in the mixed solution, and after stirring for 5 hours, 40 ml of graphene oxide was slowly added dropwise. The precipitate was collected by centrifugation, washed three times with deionized water, and dried under vacuum to obtain the complex precursor. Finally, the cobalt disulfide nanocrystal / graphene composite electrode material was obtained by holding the temperature at 300 °C for 2 hours in a vacuum atmosphere of 10 Pascals.

[0060] The collected products were added with carbon black and a binder to grind and mix evenly, the slurry was coated on copper foil, dried at 100 °C for 8 hou...

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Abstract

The invention discloses a cobalt disulfide nanocrystal / graphene composite electrode material and a preparation method thereof. The composite electrode material comprises a load skeleton of single-layer graphene, and a cobalt sulfide nanocrystal layer and a single-layer graphene layer which are stacked on the upper surface and the lower surface of the load skeleton layer by layer. According to the cobalt disulfide nanocrystal / graphene composite electrode material and the preparation method thereof, combine the two substances to obtain the novel composite electrode material with good structure optimization performance. The electrode material is low in cost; efficient in manufacturing; uniform in grain distribution and high in electrochemical capacity. The electrode material has excellentconductivity, high specific surface area and good stability.

Description

technical field [0001] The invention relates to the field of high specific capacity composite materials for lithium ion batteries, in particular to a cobalt disulfide nanocrystal / graphene composite electrode material and a preparation method. Background technique [0002] The energy density of traditional lithium-ion batteries has been unable to meet the electricity demand of various electronic devices in human daily life. Therefore, there is an urgent need to improve the performance of electrode materials for lithium batteries. [0003] Cobalt disulfide has low resistivity, good catalytic activity and chemical stability, but it is prone to self-agglomeration, and the active sites cannot be fully exposed, which affects its catalytic properties and cycle stability of energy storage. In the prior art, cobalt disulfide has the advantages of high specific capacity, easy availability of raw materials and abundant sources, but its stability is poor, and it is impossible to prepar...

Claims

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Application Information

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IPC IPC(8): H01G11/36H01G11/24H01G11/28H01G11/26H01G11/50H01G11/30H01G11/86B82Y30/00
CPCB82Y30/00H01G11/24H01G11/26H01G11/28H01G11/30H01G11/36H01G11/50H01G11/86Y02E60/13
Inventor 谢正伟王斌汪沣付光辉汪岳峰
Owner 创普斯(深圳)新能源科技有限公司
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