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Preparation method of molybdenum-doped flaky 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 electrochemical performance, reducing the number of surface active sites, and complicated preparation methods, achieving simple steps, energy saving, Avoid agglomeration phenomenon, the effect of simple steps

Active Publication Date: 2019-07-02
FUZHOU UNIVERSITY
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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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  • Preparation method of molybdenum-doped flaky cobalt diselenide/graphene composite electrode material
  • Preparation method of molybdenum-doped flaky cobalt diselenide/graphene composite electrode material
  • Preparation method of molybdenum-doped flaky cobalt diselenide/graphene composite electrode material

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Embodiment 1

[0028] A molybdenum-doped flake CoSe 2 The preparation method of / graphene composite electrode material, concrete process is as follows:

[0029] (1) Preparation of reaction solution

[0030] Dissolve cobalt nitrate and cetyltrimethylammonium bromide in 50 mL deionized water at a molar ratio of 2:1, the molar number of cobalt nitrate is 1 mmol, and add 40 mg 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, hydrothermally reacted at 140 °C for 24 h, and the heating rate was controlled at 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 ammonium molybdate were placed in a porcelain boat, heated to 200 °C under an argon atmosphere, and reacted for 1 hou...

Embodiment 2

[0038] A molybdenum-doped flake CoSe 2 The preparation method of / graphene composite electrode material, concrete process is as follows:

[0039] (1) Preparation of reaction solution

[0040] Dissolve cobalt nitrate and cetyltrimethylammonium bromide in 50 mL deionized water at a molar ratio of 2:1, the molar number of cobalt nitrate is 1 mmol, and add 40 mg 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 hydrothermally reacted at 180 °C for 24 h, and the heating rate was controlled at 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 ammonium molybdate were placed in a porcelain boat, heated to 200 °C under an argon atmosphere, and reacted for 1...

Embodiment 3

[0048] A molybdenum-doped flake CoSe 2 The preparation method of / graphene composite electrode material, concrete process is as follows:

[0049] (1) Preparation of reaction solution

[0050] Dissolve cobalt nitrate and cetyltrimethylammonium bromide in 50 mL deionized water at a molar ratio of 2:1, the molar number of cobalt nitrate is 1 mmol, and add 40 mg 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 reactor with a volume of 80 mL, hydrothermally reacted at 220 °C for 24 h, and the heating rate was controlled at 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 ammonium molybdate were placed in a porcelain boat, heated to 200 °C under an argon atmosphere, and reacted for 1 hou...

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Abstract

The invention belongs to the technical field of preparation of composite electrode materials, and particularly relates to a preparation method and application of a molybdenum-doped flaky CoSe2 / graphene composite electrode material. The method comprises the steps: performing hydrothermal reaction, taking cobalt nitrate as a cobalt source, taking hexadecyl trimethyl ammonium bromide as a surfactant,and carrying out a one-step reaction to obtain a CoSe2 precursor; doping molybdenum ions into the CoSe2 precursor in a molten state through a calcination method, selenizing the precursor through selenium steam, and reducing graphene oxide into graphene at the same time to obtain the molybdenum-doped flaky CoSe2 / graphene composite electrode material. When the prepared electrode material is assembled into a lithium ion battery, the specific capacitance shown by the electrode material reaches up to 996 mAh g<-1>, and the material can be used as a lithium ion battery negative electrode material.

Description

technical field [0001] 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. Background technique [0002] With the rapid development of modern society, the society's demand for energy supply continues to increase, and human beings need to reduce their dependence on fossil fuels and turn to sustainable clean energy. Due to its high energy density and long cycle life, rechargeable batteries can provide clean energy while reusing energy, thus providing a solution for humans to reduce environmental dependence and environmental damage. Over the past few decades, lithium-ion batteries (LIBs) have been widely used as power sources for portable electronic devices. At present, the core issue of this technology is to further increase the energy density of LIB to achieve the same effect as that of fuel vehicles. [000...

Claims

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Application Information

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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 UNIVERSITY
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