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Zinc sulfide@carbon composite microsphere and preparation method and application thereof

A technology of carbon composite and zinc sulfide, applied in chemical instruments and methods, manufacturing of hybrid/electric double-layer capacitors, electrochemical generators, etc., can solve problems such as poor cycle stability, and achieve strong conductivity, uniform appearance, and structural firm effect

Inactive Publication Date: 2019-04-16
LINGNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the defects of poor cycle stability described in the above-mentioned prior art, the present invention provides a preparation method of zinc sulfide@carbon composite microspheres, the zinc sulfide@carbon composite microspheres prepared by the preparation method have better cycle stability High and more conductive

Method used

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  • Zinc sulfide@carbon composite microsphere and preparation method and application thereof
  • Zinc sulfide@carbon composite microsphere and preparation method and application thereof
  • Zinc sulfide@carbon composite microsphere and preparation method and application thereof

Examples

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Embodiment 1

[0037] Under stirring, 4 mmol of zinc gluconate and 12 mmol of thiourea were dissolved in 60 mL of water to form a transparent solution. The concentration of zinc gluconate in the solution was 0.067 mol / L, and the molar ratio of zinc gluconate to thiourea was 1:3. This solution was transferred to a 100 mL stainless steel reactor lined with polytetrafluoroethylene. Place in a dry box and react at 200°C for 24 hours. Then it was naturally cooled to room temperature, and the resulting brown-black precipitate was rinsed three times with deionized water and absolute ethanol, separated by centrifugation and vacuum-dried at 60° C. for 12 hours. The obtained solid product was heat-treated at 500° C. for 2 hours in an argon atmosphere to obtain the product.

Embodiment 2

[0039] The difference between this embodiment and embodiment 1 is that the concentration of zinc gluconate in this embodiment is 0.1mol / L, the molar ratio of zinc gluconate and thiourea is 1: 2.7, and the temperature of hydrothermal reaction is 220 ℃;

[0040] Other conditions and operation steps are identical with embodiment 1.

Embodiment 3

[0042] The difference between this embodiment and Example 1 is that the concentration of zinc gluconate in this embodiment is 0.03mol / L, the molar ratio of zinc gluconate and thiourea is 1: 2.5, and the temperature of the hydrothermal reaction is 180°C;

[0043] Other conditions and operation steps are identical with embodiment 1.

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Abstract

The invention discloses a zinc sulfide@carbon composite microsphere and preparation method and application thereof. The preparation method comprises the following steps of S1, performing hydrothermalreaction on zinc gluconate and a sulfur source in water after dissolution, and performing post-processing to obtain solid powder; and S2, performing thermal treatment on the solid powder in an inert atmosphere to obtain the zinc sulfide@carbon composite microsphere. The zinc sulfide@carbon composite microsphere provided by the invention is prepared by the zinc gluconate as a zinc source and a carbon source by combining a hydrothermal method and a thermal processing technology. The zinc sulfide@carbon composite microsphere is higher in circulation stability, higher in conductivity, relatively uniform in morphology and high in yield; and moreover, the preparation process is simple and is low in cost, and the zinc sulfide@carbon composite microsphere can be rapidly synthesized on a large scale. The zinc sulfide@carbon composite microsphere has a very good application prospect in the field of a supercapacitor electrode material, a lithium ion battery electrode material or a photocatalyst.

Description

technical field [0001] The invention relates to the field of micro-nano semiconductor composite materials, and more specifically, to a zinc sulfide@carbon composite microsphere and its preparation method and application. Background technique [0002] In contemporary society, energy issues are one of the major global issues and have attracted widespread attention. Finding new materials with excellent effects in energy storage and use has become an important task for scientists. Graphite carbon materials are still the first choice for lithium-ion battery anode materials in the future due to their good cycle stability, ideal charge-discharge platform, and high cost performance. However, the charge-discharge specific capacity and volume specific capacity of carbon materials are low, and it is necessary to develop new negative electrode materials to meet the requirements of high-capacity batteries. In the research of new non-carbon anode materials, Zn-based materials show good c...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525H01G11/86H01G11/24H01G11/30B01J27/04
CPCH01M4/366H01M4/5815H01M4/625H01M4/628H01M10/0525H01G11/24H01G11/30H01G11/86B01J27/04H01M2004/027H01M2004/021B01J35/33B01J35/39Y02E60/13Y02E60/10
Inventor 马琳许丽梅周晓平唐晓山凌妍
Owner LINGNAN NORMAL UNIV
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