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A polyoxometalate-based polydopamine sodium ion battery anode material coated with reduced graphene oxide and its preparation method

A polyoxometalate and sodium polydopamine technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of difficulty in fixing polyoxometalate clusters, reduce redox active sites, etc., and achieve increased Redox active sites, high mechanical strength and chemical stability, improved electrical conductivity and processability effects

Active Publication Date: 2022-04-19
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A polyoxometalate-based polydopamine sodium ion battery anode material coated with reduced graphene oxide and its preparation method
  • A polyoxometalate-based polydopamine sodium ion battery anode material coated with reduced graphene oxide and its preparation method
  • A polyoxometalate-based polydopamine sodium ion battery anode material coated with reduced graphene oxide and its preparation method

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Effect test

Embodiment 1

[0017] Prepare PMo as follows 10 V 2 @CN-RGO:

[0018] A. Add dopamine powder and graphene oxide solution to PMo 10 V 2 aqueous solution, and the mixture was further stirred for 1 hour;

[0019] B. The resulting mixture was transferred to a Teflon-lined autoclave and heat-treated at 160 °C for 16 h. After cooling to room temperature, obtain the PMo of black powder 10 V 2 @CN-RGO. ( figure 1 )

[0020] 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.

[0021] Such as image 3 As shown, PMo was studied with a scanning electron microscope (SEM) 10 V 2 Morphology and structure ...

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Abstract

The invention discloses a polyoxometalate-based polydopamine sodium ion battery anode material coated with reduced graphene oxide. The material is PMo10V2@CN‑RGO. The specific preparation steps are as follows: A. Dopamine powder and graphene oxide solution were added to PMo10V2 aqueous solution, and the mixture was further stirred for 1 hour; B. The resulting mixture was transferred into a Teflon-lined autoclave and heat-treated at 160 °C for 16 h, and after cooling to room temperature, PMo10V2@CN‑RGO was obtained as a black powder. In the present invention, by adding dopamine to polymerize, the polyoxometalate clusters can be evenly fixed on the carbon carrier graphene oxide plate, the electrical conductivity and processability of the anode material are improved, and the method has extremely high mechanical strength and chemical stability. The preparation method of the invention has 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 polyoxometalate-based polydopamine sodium ion battery anode material coated with reduced graphene oxide 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 goo...

Claims

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Application Information

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