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MoO2/rGO composite material, and preparation method and application thereof

A composite material and mixed solution technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of harsh preparation conditions and cumbersome preparation methods, and achieve the effects of low cost, increased specific capacity and stable structure

Active Publication Date: 2019-03-15
东北大学秦皇岛分校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrochemical performance of the composite requires MoO 2 The shape of nanorods makes the preparation conditions harsh and the preparation method is cumbersome, and the performance of the composite material as a negative electrode material for potassium ion batteries is still unknown

Method used

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  • MoO2/rGO composite material, and preparation method and application thereof
  • MoO2/rGO composite material, and preparation method and application thereof
  • MoO2/rGO composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A kind of MoO 2 The preparation method of / rGO composite material, comprises the following steps:

[0059] (1) Dissolve 80 mg of graphene oxide (GO) in 30 mL of deionized water, and ultrasonicate for 1 h to obtain a well-dispersed GO solution. Add concentrated HCl dropwise to adjust the pH value to 2, and then add 0.8 g of ammonium molybdate tetrahydrate and 0.0798 g ascorbic acid, magnetically stirred for 15min until it was completely dissolved;

[0060] (2) Transfer the mixed solution obtained in step (1) into a 50mL Teflon-lined stainless steel autoclave, and conduct a hydrothermal reaction at 180°C for 15h to obtain MoO 2 / rGO composite precursor;

[0061] (3) After hydrothermal cooling to room temperature, the obtained MoO 2 / rGO composite precursor was centrifuged, fully washed with deionized water and alcohol until neutral, dried in a vacuum oven at 60 °C for 12 h, and heated to 400 °C at a heating rate of 1 °C / min under the protection of argon, and calcined fo...

Embodiment 2

[0068] A kind of MoO 2 The preparation method of / rGO composite material, comprises the following steps:

[0069] (1) Dissolve 100 mg of graphene oxide (GO) in 30 mL of deionized water, ultrasonicate for 2 hours to obtain a GO solution with good dispersion, add concentrated HCl dropwise to adjust the pH value to 1.5, add 0.8 g of ammonium molybdate tetrahydrate and 0.4560 g ascorbic acid, magnetically stirred for 30min, until it was completely dissolved;

[0070] (2) Transfer the mixed solution obtained in step (1) into a 50mL Teflon-lined stainless steel autoclave, and conduct a hydrothermal reaction at 200°C for 10h to obtain MoO 2 / rGO composite precursor;

[0071] (3) After hydrothermal cooling to room temperature, the obtained MoO 2 / rGO composite precursor was centrifuged, fully washed with deionized water and alcohol until neutral, dried in a 50°C blast drying oven for 12h, and heated to 500°C at a heating rate of 3°C / min under nitrogen protection, and calcined for 3h...

Embodiment 3

[0073] A kind of MoO 2 The preparation method of / rGO composite material, comprises the following steps:

[0074] (1) Dissolve 160mg of graphene oxide (GO) in 30mL of deionized water, ultrasonicate for 1.5h to obtain a GO solution with good dispersion, add concentrated HCl dropwise to adjust the pH value to 3, add 0.8g of ammonium molybdate tetrahydrate and 0.7980g ascorbic acid, magnetically stirred for 20min until it was completely dissolved;

[0075] (2) Transfer the mixed solution obtained in step (1) into a 50mL Teflon-lined stainless steel autoclave, and conduct a hydrothermal reaction at 220°C for 12h to obtain MoO 2 / rGO composite precursor;

[0076] (3) After hydrothermal cooling to room temperature, the obtained MoO 2 / rGO composite precursor was centrifuged, fully washed with deionized water and alcohol until neutral, dried in a vacuum oven at 100 °C for 12 h, and heated to 400 °C at a heating rate of 5 °C / min under the protection of argon, and calcined for 5 h , ...

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Abstract

The invention provides a MoO2 / rGO composite material, and a preparation method and application thereof. The method comprises the following steps: (1) adding ammonium molybdate tetrahydrate and ascorbic acid to a graphene oxide dispersion for magnetic stirring; (2) transferring the mixed liquid obtained in the step (1) to an autoclave for heating to grow a MoO2 / rGO composite precursor; (3) washing,drying and calcining the MoO2 / rGO composite precursor obtained in the step (2) to obtain the MoO2 / rGO composite material, wherein the pH of the graphene oxide dispersion in the step (1) is 1.5 to 3.The MoO2 / rGO composite material provided by the invention is simple in preparation method and steps, low in cost and strong in controllability. In the prepared MoO2 / rGO composite material, the hollowspherical MoO2s are uniformly distributed on the surface of the grapheme, with uniform particles, large specific surface area, rich pore structures, stable structure, and excellent cycle performance and rate performance, thereby having broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and relates to a negative electrode material for a potassium ion battery and its preparation method and application, in particular to a MoO 2 / rGO composites and their preparation methods and applications. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic devices, electric vehicles, and large-scale energy storage due to their advantages such as high energy density, good cycle performance, and long life. However, at present, there are problems such as lack of resources and uneven distribution of lithium resources, which cannot meet the growing demand, and the price of lithium continues to rise, which seriously restricts the application of lithium-ion batteries in large-scale energy storage. Therefore, the development of new secondary batteries with abundant resources, low cost and excellent performance has become a new development trend and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/054
CPCH01M4/366H01M4/483H01M4/624H01M4/628H01M10/054Y02E60/10
Inventor 罗绍华刘彩玲黄红波闫绳学冯建王亚峰王志远王庆张亚辉刘延国赵鑫郝爱民刘宣文郭瑞伊廷锋
Owner 东北大学秦皇岛分校
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