Zinc sulfide/rGO (reduced graphene oxide) composite material containing sulphur vacancy as well as preparation method and application thereof

A technology of composite materials and zinc sulfide, applied in the direction of active material electrodes, electrical components, battery electrodes, etc., can solve the problems of poor electrochemical performance and achieve the effects of increased sulfur load, improved utilization rate, and excellent electrochemical activity

Inactive Publication Date: 2019-02-12
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, "Energy and Environmental Science" (Energy Environ. Sci, 2017, 10: 1476-1486.) reported a sulfur-deficient molybdenum disulfide nanosheet as a positive electrode material and applied to lithium-sulfur batteries. The active material sulfur The loading capacity is 78%, and at 0.5C, the first cycle discharge specific capacity is 1159 mAhg -1 , after 500 cycles, the average capacity decay per circle is 643 mAhg -1 , the corresponding average capacity decay rate per cycle is 0.09%, and the electrochemical performance is poor

Method used

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  • Zinc sulfide/rGO (reduced graphene oxide) composite material containing sulphur vacancy as well as preparation method and application thereof
  • Zinc sulfide/rGO (reduced graphene oxide) composite material containing sulphur vacancy as well as preparation method and application thereof
  • Zinc sulfide/rGO (reduced graphene oxide) composite material containing sulphur vacancy as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]Preparation of ZnS / GO: First, carbon disulfide (0.136 mL) was added dropwise into ethylenediamine solution (68 mL), named as solution A. Add 60 mg graphene oxide GO to 80 mL ethylene glycol solution and sonicate for 30 min, the ultrasonic power is 450W, named solution B, add solution B to solution A and stir continuously for 30 min, and add to the mixture under stirring Add 34 mL of zinc nitrate solution with a concentration of 0.05 moL / L dropwise, transfer it to an autoclave at 180 o C for 12 h. After the solution was cooled to room temperature, it was centrifuged and washed with ethanol, and the precipitate was o C for 12 h, and the dried product was ZnS / GO.

[0035] ZnS 1-x Preparation of / rGO: The collected ZnS / GO samples were reduced under argon-hydrogen mixed gas, wherein the mixed gas was argon-hydrogen mixed gas with hydrogen accounting for 10%, and reduced at high temperature with a heating rate of 5 o C / min, heating up to 650 o C, keep warm for 6 h, get Zn...

Embodiment 2

[0043] Preparation of ZnS / GO: First, carbon disulfide (0.1 mL) was added dropwise into ethylenediamine solution (40 mL), named as solution A. Afterwards, 30 mg of graphene oxide GO was added to 40 mL of ethylene glycol solution and sonicated for 20 min at an ultrasonic power of 450 W, named as solution B, and solution B was added to solution A and stirred continuously for 30 min. Add 34 mL of 0.05 mol / L zinc nitrate solution dropwise to the mixture, transfer it to an autoclave at 180 o C for 12 h. After the solution was cooled to room temperature, it was centrifuged and washed with ethanol, and the precipitate was o C for 12 h, and the dried product was ZnS / GO.

[0044] ZnS 1-x Preparation of / rGO: The collected ZnS / GO samples were reduced under argon-hydrogen mixed gas, wherein the mixed gas was argon-hydrogen mixed gas with hydrogen accounting for 10%, and reduced at high temperature with a heating rate of 3 o C / min, heating up to 400 o C, keep warm for 6 h, get ZnS con...

Embodiment 3

[0052] Preparation of ZnS / GO: First, carbon disulfide (0.116 mL) was added dropwise into ethylenediamine solution (50 mL), named as solution A. Afterwards, 40 mg of graphene oxide GO was added to 60 mL of ethylene glycol solution and sonicated for 50 min at an ultrasonic power of 450 W, named solution B, and solution B was added to solution A and stirred continuously for 30 min. Add 34 mL of 0.05 mol / L zinc nitrate solution dropwise to the mixture, transfer it to an autoclave at 140 o C for 12 h. After the solution was cooled to room temperature, it was centrifuged and washed with ethanol, and the precipitate was separated at 30-60 o C for 12 h, and the dried product was ZnS / GO.

[0053] ZnS 1-x Preparation of / rGO: The collected ZnS / GO samples were reduced under argon-hydrogen mixed gas, wherein the mixed gas was argon-hydrogen mixed gas with hydrogen accounting for 10%, and reduced at high temperature with a heating rate of 10 o C / min, heating up to 800 o C, keep warm f...

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Abstract

The invention belongs to the technical field of new energy materials, and particularly relates to a zinc sulfide/rGO (reduced graphene oxide) composite material as well as a preparation method and application thereof. The preparation method of the zinc sulfide/rGO composite material containing the sulphur vacancy comprises the following steps: ZnS/GO is prepared as follows: carbon disulfide is added into a ethylenediamine water solution drop by drop, and the mixture is named as a solution A; graphene oxide GO is added into an ethylene glycol solution to be subjected to ultrasonic treatment, and the mixture is named as a solution B; the solution B is added into the solution A and continuously stirred, and then a mixed solution is obtained; a zinc nitrate solution is added dropwise into themixture while stirring; the mixed product is heated and cooled to room temperature, and then subjected to centrifuging and washing, and the dried product is ZnS/GO; then the ZnS/GO prepared in the step (1) is reduced at high temperature under the condition of argon-hydrogen combination gas, and ZnS<1-x>/rGO containing the sulphur vacancy is obtained. The invention adopts a simple and safe one-potwet chemical sulphur loading method and abandons a traditional fusing diffusing method, the loss is reduced, and the loading capacity of active sulphur is as high as 90%.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a zinc sulfide / rGO composite material and its preparation method and application. Background technique [0002] At present, environmental pollution and energy shortage have become two serious crises facing the development of human society today, which force people to develop new green energy to replace traditional fossil energy. Wind energy, solar energy, tidal energy, etc. are renewable energy sources, but due to the uneven distribution of time and space, corresponding energy storage devices are required to be used together. Therefore, developing a safe, stable, efficient, and environmentally friendly energy storage device is a core goal in alleviating energy and environmental crises. With the rapid increase of people's demand for mobile application equipment and large-scale energy storage, especially the rapid development of electric vehicles, conventi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/5815H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 张昭良郑德超张景皓辛颖李倩
Owner UNIV OF JINAN
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