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A kind of preparation method of molybdenum-doped flake cobalt diselenide/graphene composite electrode material

A graphene composite and electrode material technology, applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve the problems of reducing the number of surface active sites, complex preparation methods, and reducing electrochemical performance, so as to improve electrochemical performance , simple steps, easy to contact with the electrode effect

Active Publication Date: 2022-06-24
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current preparation method of double metal selenide is relatively complicated, so it is necessary to optimize the preparation method to achieve the purpose of convenience and energy saving
In addition, many metal selenides are prone to agglomeration during the preparation process, which will reduce the number of surface active sites, thereby reducing the electrochemical performance.

Method used

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  • A kind of preparation method of molybdenum-doped flake cobalt diselenide/graphene composite electrode material
  • A kind of preparation method of molybdenum-doped flake cobalt diselenide/graphene composite electrode material
  • A kind of preparation method of molybdenum-doped flake cobalt diselenide/graphene composite electrode material

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Effect test

Embodiment 1

[0028] A Molybdenum-Doped Flake CoSe 2 / The preparation method of graphene composite electrode material, the specific process is as follows:

[0029] (1) Prepare the reaction solution

[0030] Dissolve cobalt nitrate and cetyltrimethylammonium bromide in 50 mL deionized water in a molar ratio of 2:1, the mole number of cobalt nitrate is 1 mmol, and add 40 mg of graphene oxide, ultrasonically disperse 1 Hour.

[0031] (2) Preparation of CoSe by hydrothermal reaction 2 Precursor

[0032] The above system was poured into a polytetrafluoroethylene reactor with a volume of 80 mL, and the hydrothermal reaction was carried out at 140 °C for 24 h, and the heating rate was controlled to be 2 °C / min. After the reaction, the obtained product was washed with deionized water and ethanol, and dried under vacuum at 60°C.

[0033] (3) Molybdenum ion doping reaction

[0034] The precursor and 0.5 mmol of ammonium molybdate were placed in a ceramic boat, heated to 200 °C in an argon atmo...

Embodiment 2

[0038] A Molybdenum-Doped Flake CoSe 2 / The preparation method of graphene composite electrode material, the specific process is as follows:

[0039] (1) Prepare the reaction solution

[0040] Dissolve cobalt nitrate and cetyltrimethylammonium bromide in 50 mL deionized water in a molar ratio of 2:1, the mole number of cobalt nitrate is 1 mmol, and add 40 mg of graphene oxide, ultrasonically disperse 1 Hour.

[0041] (2) Preparation of CoSe by hydrothermal reaction 2 Precursor

[0042] The above system was poured into a polytetrafluoroethylene reactor with a volume of 80 mL, and the hydrothermal reaction was carried out at 180 °C for 24 h, and the heating rate was controlled to be 2 °C / min. After the reaction, the obtained product was washed with deionized water and ethanol, and dried under vacuum at 60°C.

[0043] (3) Molybdenum ion doping reaction

[0044] The precursor and 0.5 mmol of ammonium molybdate were placed in a ceramic boat, heated to 200 °C in an argon atmo...

Embodiment 3

[0048] A Molybdenum-Doped Flake CoSe 2 / The preparation method of graphene composite electrode material, the specific process is as follows:

[0049] (1) Prepare the reaction solution

[0050] Dissolve cobalt nitrate and cetyltrimethylammonium bromide in 50 mL deionized water in a molar ratio of 2:1, the mole number of cobalt nitrate is 1 mmol, and add 40 mg of graphene oxide, ultrasonically disperse 1 Hour.

[0051] (2) Preparation of CoSe by hydrothermal reaction 2 Precursor

[0052] The above system was poured into a polytetrafluoroethylene reaction kettle with a volume of 80 mL, and the hydrothermal reaction was carried out at 220 °C for 24 h, and the heating rate was controlled to be 2 °C / min. After the reaction, the obtained product was washed with deionized water and ethanol, and dried under vacuum at 60°C.

[0053] (3) Molybdenum ion doping reaction

[0054] The precursor and 0.5 mmol of ammonium molybdate were placed in a ceramic boat, heated to 200 °C in an ar...

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Abstract

The invention belongs to the technical field of preparation of composite electrode materials, in particular to a molybdenum-doped flake CoSe 2 Preparation method and application of graphene composite electrode material. Through hydrothermal reaction, using cobalt nitrate as cobalt source and cetyltrimethylammonium bromide as surfactant, CoSe 2 Precursor, and then through the calcination method, molybdenum ions are first doped into CoSe in the molten state 2 In the precursor body, the precursor is then selenized by selenium vapor, and graphene oxide is reduced to graphene at the same time to obtain molybdenum-doped flake CoSe 2 / graphene composite electrode material. When the electrode material prepared in the present invention is assembled into a lithium-ion battery, its specific capacitance exhibited is as high as 996 mAh g ‑1 , can be used for lithium-ion battery anode materials.

Description

technical field [0001] The invention belongs to the technical field of composite electrode material preparation, in particular to a molybdenum-doped flake CoSe 2 Preparation method and application of graphene / graphene composite electrode material. Background technique [0002] With the rapid development of modern society, society's demand for energy supply continues to increase, and human beings need to reduce their dependence on fossil fuels and turn to sustainable and clean energy. Due to its high energy density and long cycle life, rechargeable batteries can not only provide clean energy, but also reuse energy, thus providing a solution for human beings to reduce environmental dependence and environmental damage. Lithium-ion batteries (LIBs) have been widely used as power sources for portable electronic devices over the past few decades. At present, the core problem of this technology is to further improve the energy density of LIBs to achieve a use effect comparable to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M4/62H01M10/0525
CPCH01M4/364H01M4/581H01M4/628H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 郑玉婴张祥
Owner FUZHOU UNIV
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