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Reduced graphene oxide-coated polyoxometallate-based polydopamine battery anode material and preparation method thereof

A polyoxometalate, polydopamine battery technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as difficulty in fixing polyoxometalate clusters, reducing redox active sites, etc. The effect of mechanical strength and chemical stability, low cost and high yield

Active Publication Date: 2021-02-19
XUZHOU NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, negatively charged polyoxometallate clusters are difficult to immobilize on negatively charged carbon-supported graphene oxide sheets
In addition, the supported polyoxometalates are easily stacked on or exfoliated from GO, which inevitably reduces the redox active sites in contact with the electrolyte.

Method used

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  • Reduced graphene oxide-coated polyoxometallate-based polydopamine battery anode material and preparation method thereof
  • Reduced graphene oxide-coated polyoxometallate-based polydopamine battery anode material and preparation method thereof
  • Reduced graphene oxide-coated polyoxometallate-based polydopamine battery anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Prepare PMo as follows 10 V 2 @CN-RGO:

[0019] A. Addition of dopamine powder and graphene oxide solution to PMo 10 V 2 aqueous solution, and the mixture was further stirred for 1 h;

[0020] B. The resulting mixture was transferred to a Teflon-lined autoclave and heat-treated at 160°C for 16 hours. After cooling to room temperature, obtain the PMo of black powder 10 V 2 @CN-RGO. ( figure 1 )

[0021] Such as figure 2 Shown, PMo 10 V 2 In the X-ray diffraction (XRD) collection of illustrative plates, the characteristic peak of Keggin type polyoxometalate, in PMo 10 V 2 @CN and PMo 10 V 2 In @CN-RGO, a "bread"-shaped diffraction peak appears, and PMo 10 V 2 The characteristic diffraction peaks of the are not visible, indicating the amorphous morphology of adhesive polydopamine and PMo 10 V 2 homogeneous dispersion of molecules.

[0022] Such as image 3 As shown, PMo was studied with a scanning electron microscope (SEM) 10 V 2 Morphology and stru...

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Abstract

The invention discloses a polyoxometallate-based polydopamine battery anode material coated with reduced graphene oxide. The polyoxometallate-based polydopamine battery anode material is PMo10V2 (at)CNR-GO. The preparation method comprises the following specific preparation steps: A, adding dopamine powder and a graphene oxide solution into a PMo10V2 aqueous solution, and further stirring the mixture for 1 hour; B, transferring the obtained mixture into a high-pressure kettle lined with Teflon, and carrying out heat treatment at 160 DEG C for 16 hours; and cooling to the room temperature to obtain the black powdery PMo10V2 (at) CN-RGO. According to the preparation method, dopamine is added for polymerization, so that the polyoxometallate cluster can be uniformly fixed on the carbon carrier graphene oxide plate, the conductivity and the processability of the anode material are improved, and the material has extremely high mechanical strength and chemical stability. The preparation method provided by the invention has the advantages of few steps, mild reaction conditions, low cost and high yield.

Description

technical field [0001] The invention relates to the technical field of sodium metal batteries, in particular to a reduced graphene oxide-coated polyoxometalate-based polydopamine battery anode material and a preparation method thereof. Background technique [0002] Research in the field of electrochemical energy storage has received increasing attention from society as the need to store electricity reliably and economically has been identified as a key factor in a wide range of fields. Sodium-ion batteries are a promising candidate due to their relatively low cost due to the relatively high amount of sodium in the earth's crust. However, current anode materials suffer from low activity and narrow interlayer spacing, which severely limit the further applications of SIBs. Therefore, it is of great significance to design and fabricate advanced anode materials with enlarged interlayer spacing, abundant active sites, fast electron / ion transfer capability, and good structural sta...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/60H01M4/583H01M10/054
CPCH01M4/366H01M4/602H01M4/583H01M10/054H01M2004/028Y02E60/10
Inventor 黄鹏胡海
Owner XUZHOU NORMAL UNIVERSITY
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