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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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  • Summary
  • 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 is its low thermal stability. Generally, thermal decomposition occurs at 550°C to generate sulfur vapor. Sulfur vapor easily reacts exothermicly with the lithium alloy in the negative electrode, resulting More heat, which accelerates the decomposition of iron disulfide, which eventually leads to premature failure of the battery

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

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Embodiment 1

[0036] This embodiment relates to a method for preparing a cobalt disulfide nanocrystal / graphene composite electrode material. An electrode material composed of cobalt disulfide nanocrystal grains and graphene with a size of 1-10 nanometers is prepared by vacuum low-temperature calcination. The preparation method of the composite electrode material composites cobalt disulfide nano crystal grains and single-layer graphene. The graphene is a single layer of graphite, which is composed of hexagonal arrangement of carbon atoms, has 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 it is prone to self-agglomeration, and the active sites cannot be fully exposed, which affects its catalytic prop...

Embodiment 1

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

[0055] Stir and mix absolute ethanol and polyvinyl alcohol at a volume ratio of 6:1 to obtain a mixed solution. Take 2 ml of the 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. Stir ultrasonically for 1 hour, stand still, collect the precipitate by centrifugation, wash several times with deionized water, for example three times, and freeze-dry to obtain the composite precursor. Finally, under a vacuum environment of 40 Pascals, the temperature was kept at 350° C. for 0.5 hours to obtain a cobalt disulfide nanocrystal / graphene composite electrode material.

[0056] Add carbon black and adhesive to the collected product, grind and mix evenly, apply the slurry on c...

Embodiment 2

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

[0059] Stir and mix absolute ethanol and polyvinyl alcohol at a volume ratio of 1:1, and take 4 ml of the mixed solution. 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, for example, the concentration of graphene oxide was: 25 m g / ml, stirred ultrasonically for 2 hours, and stood still. The precipitate was collected by centrifugation, washed three times with deionized water, and dried in vacuum to obtain the composite precursor. Finally, under a vacuum atmosphere of 10 Pascals, the temperature was kept at 300° C. for 2 hours to obtain a cobalt disulfide nanocrystal / graphene composite electrode material.

[0060] Add carbon black and adhesive to the collected product, grind and mix evenly, apply the slurry on coppe...

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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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