Flower-like zinc selenide-manganese/carbon composite material as well as preparation method and application thereof

A technology of carbon composite materials and zinc selenide, applied in nanotechnology, electrochemical generators, nanotechnology, etc. for materials and surface science, can solve the problems of continuous pulverization of electrode materials, limited specific capacity, and reduced capacity , to achieve the effect of improving specific capacity and electrochemical stability, good structural stability and flexibility, and improving ion migration efficiency

Pending Publication Date: 2022-07-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, zinc selenide is a semiconductor like other metal compounds, resulting in poor conductivity and sodium ion diffusion efficiency of zinc selenide, which severely limits its specific capacity in the process of storing sodium.
In addition, pure zinc selenide electrodes tend to experience huge volume expansion during charge and discharge, resulting in the inability to form a stable solid interfacial plasma film, which eventually leads to continuous pulverization of the electrode material and a rapid decrease in capacity.
These problems directly limit the commercial application of zinc selenide-based sodium ion anode materials

Method used

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  • Flower-like zinc selenide-manganese/carbon composite material as well as preparation method and application thereof
  • Flower-like zinc selenide-manganese/carbon composite material as well as preparation method and application thereof
  • Flower-like zinc selenide-manganese/carbon composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method of flower-shaped zinc selenide-manganese / carbon composite material, comprising the following steps:

[0036] (1) 1mmol zinc nitrate, 0.5mmol manganese nitrate, 2mmol trimesic acid and 3g polyvinylpyrrolidone (number average molecular weight is 30k) are dissolved in 80mL solvent to obtain mixed solution; wherein the solvent is composed of N,N-dimethyl Formamide and ethanol are composed of 1:1 by volume;

[0037] (2) Transfer the above-mentioned mixed solution to a polytetrafluoroethylene-stainless steel reactor for solvothermal reaction, the solvothermal reaction temperature is 160 ° C, and the reaction time is 6h. Washing and drying to obtain flower-like precursor;

[0038] (3) The flower-like precursor and the selenium powder were placed in two reaction boats respectively, and the flower-like precursor and the selenium powder were in a mass ratio of 1:2, and then placed in a tube furnace, under an argon atmosphere with The temperature was increas...

Embodiment 2

[0042] A preparation method of flower-shaped zinc selenide-manganese / carbon composite material, comprising the following steps:

[0043] (1) 1mmol zinc nitrate, 0.5mmol manganese nitrate, 2mmol trimesic acid and 3g polyvinylpyrrolidone (number average molecular weight is 30k) are dissolved in 80mL solvent to obtain mixed solution; wherein the solvent is composed of N,N-dimethyl Formamide and ethanol are composed of 1:1 by volume;

[0044] (2) The above mixed solution is transferred to a polytetrafluoroethylene-stainless steel reaction kettle for solvothermal reaction, the solvothermal reaction temperature is 160°C, and the reaction time is 6h. Washing and drying to obtain flower-like precursor;

[0045] (3) The flower-like precursor and the selenium powder were placed in two reaction boats respectively, and the flower-like precursor and the selenium powder were in a mass ratio of 1:2, and then placed in a tube furnace, under an argon atmosphere with The temperature was incre...

Embodiment 3

[0047] A preparation method of flower-shaped zinc selenide-manganese / carbon composite material, comprising the following steps:

[0048] (1) 1mmol zinc nitrate, 0.5mmol manganese nitrate, 2mmol trimesic acid and 3g polyvinylpyrrolidone (number average molecular weight is 30k) are dissolved in 80mL solvent to obtain mixed solution; wherein the solvent is composed of N,N-dimethyl Formamide and ethanol are composed of 1:1 by volume;

[0049] (2) The above mixed solution was transferred to a polytetrafluoroethylene-stainless steel reaction kettle for solvothermal reaction, the solvothermal reaction temperature was 120°C, and the reaction time was 4h. After the reaction was completed, it was naturally cooled to room temperature, and the obtained material was centrifuged for 3 times. Washing and drying to obtain flower-like precursor;

[0050] (3) The flower-like precursor and the selenium powder were placed in two reaction boats respectively, and the flower-like precursor and the ...

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Abstract

The invention provides a flower-like zinc selenide-manganese / carbon composite material and a preparation method and application thereof.The flower-like zinc selenide-manganese / carbon composite material comprises a flower-like structure formed by assembling 2D porous carbon nanosheets, the 2D porous carbon nanosheets are loaded with zinc selenide-manganese particles, the chemical general formula is Zn (1-x) MnxSe, and x is larger than or equal to 0.2 and smaller than or equal to 0.4; the preparation method comprises the following steps: (1) dissolving zinc nitrate, manganese nitrate, polyvinylpyrrolidone and trimesic acid in a solvent to obtain a mixed solution; (2) carrying out solvothermal reaction on the mixed solution, naturally cooling to room temperature after the solvothermal reaction is finished, and carrying out centrifugal washing and drying to obtain a flower-shaped precursor; and (3) calcining the flower-like precursor and selenium powder in an argon atmosphere, cooling, grinding and sieving. The composite material has a good conductive network, provides a buffer space for volume expansion of the material, and can reduce the migration distance of ions so as to improve the overall ion migration efficiency of the material and improve the specific capacity and electrochemical stability of the material.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a flower-shaped zinc selenide-manganese / carbon composite material and a preparation method and application thereof. Background technique [0002] Na-ion batteries have the advantages of low cost and high raw material abundance. However, the current negative electrode materials for sodium-ion batteries have low mass specific capacity, and are prone to generate dendrite sodium during high-current charge and discharge, causing safety problems, which seriously restrict their large-scale commercial application. anode material for sodium-ion batteries. Zinc selenide can undergo conversion reaction and alloying reaction at the same time, so it has a better theoretical capacity advantage than other selenides, and zinc selenide has a lower discharge platform and is environmentally friendly and low cost. It has always been considered as a negative electrode for sodium io...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/054B82Y30/00B82Y40/00
CPCH01M4/362H01M4/58H01M4/583H01M10/054B82Y30/00B82Y40/00H01M2004/027Y02E60/10
Inventor张明瑜周鹏苏哲安黄启忠
OwnerCENT SOUTH UNIV