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Method for electrochemically assisted preparation of low-defect expanded graphite paper

An expanded graphite, low-defect technology, applied in the field of materials, can solve the problems of large-scale promotion of unfavorable preparation methods, damage to the structural integrity of graphite paper, and decreased conductivity of expanded graphite paper, so as to facilitate the transmission of ions and electrons, and reduce defects. Less, promotes the effect of uniform distribution

Pending Publication Date: 2022-03-01
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the thermal expansion method must be carried out at high temperature; the mixed acid treatment method and the anodic oxidation method will inevitably introduce a large number of oxygen-containing groups on the treated graphite paper, destroying the structural integrity of the graphite paper, resulting in the expansion of the expanded graphite paper. The electrical conductivity decreases; while the electrochemical cathodic exfoliation method intercalates graphite paper at the cathode potential to ensure the integrity of the graphite structure. However, due to the large size of solvated cations, it is often necessary to intercalate at a higher voltage, and Specific organic solvents must be used, which is not conducive to the large-scale promotion of the preparation method

Method used

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  • Method for electrochemically assisted preparation of low-defect expanded graphite paper
  • Method for electrochemically assisted preparation of low-defect expanded graphite paper
  • Method for electrochemically assisted preparation of low-defect expanded graphite paper

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Cut graphite paper into 1cm×1.5cm, and then dry it in an oven at 80°C for 24 hours; use concentrated sulfuric acid as electrolyte, platinum wire as counter electrode, and graphite paper as working electrode (immersion surface is 1cm×1cm). Keep it under the voltage of 1.6V for 1 minute and take it out; then quickly immerse it in 50mL hydrogen peroxide solution, let it stand for 1 minute, then put it in a water bath at 50°C, let it stand for 3 hours; The graphite paper was taken out, rinsed with deionized water, and soaked in 100 mL of deionized water for 10 hours; finally, the low-defect expanded graphite paper was dried in an oven at 80°C for 10 hours to obtain a low-defect expanded graphite paper.

Embodiment 2

[0023] Cut graphite paper into 1cm×1.5cm, and then dry it in an oven at 80°C for 24 hours; use concentrated sulfuric acid as electrolyte, platinum wire as counter electrode, and graphite paper as working electrode (immersion surface is 1cm×1cm). Keep it under 1.6V voltage for 1 minute and take it out; quickly immerse it in 50mL hydrogen peroxide solution, let it stand for 1 minute, then put it in a water bath at 80°C, let it stand for 0.5 hour; after the reaction is over, expand the low defect The graphite paper was taken out, rinsed with deionized water, soaked in 100 mL of deionized water for 10 hours, and finally the low-defect expanded graphite paper was dried in an oven at 80°C for 10 hours to obtain a low-defect expanded graphite paper.

Embodiment 3

[0025] Cut graphite paper into 1cm×1.5cm, and then dry it in an oven at 80°C for 24 hours; use concentrated sulfuric acid as electrolyte, platinum wire as counter electrode, and graphite paper as working electrode (immersion surface is 1cm×1cm). Keep the voltage at 2V for 30 seconds and take it out; quickly immerse it in 50mL hydrogen peroxide solution, let it stand for 1 minute, then put it in a water bath at 65°C, let it stand for 2 hours; The paper was taken out, rinsed with deionized water, then soaked in 100 mL of deionized water for 12 hours, and finally the low-defect expanded graphite paper was dried in an oven at 80°C for 8 hours to obtain a low-defect expanded graphite paper.

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Abstract

The invention provides a method for electrochemically assisted preparation of low-defect expanded graphite paper. According to the invention, graphite paper with low cost is used as a raw material, concentrated sulfuric acid is used as an electrolyte, and the graphite paper is subjected to electrochemical intercalation under a two-electrode system; and immersing the obtained intercalated graphite paper into a hydrogen peroxide solution, carrying out a water bath reaction, and destroying Van der Waals' force between graphite layers by using a gas release reaction generated between the layers, thereby obtaining the low-defect expanded graphite paper with a three-dimensional structure. According to the method, the expanded graphite paper with an obvious three-dimensional structure is obtained by using a relatively simple production process, and the structural integrity of the graphite paper is effectively maintained.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for electrochemically assisting the preparation of low-defect expanded graphite paper. Background technique [0002] One of the keys to the development of new energy storage devices is to prepare composite electrode materials with good performance. The application of three-dimensional carbon-based current collectors in composite electrodes not only ensures the high dispersion of active materials and self-supporting properties of electrodes, but also promotes the transport of electrons and ions during charge and discharge, endowing electrode materials with excellent energy storage properties. Graphite paper is expected to be used as carbon-based current collectors for commercial energy storage devices due to its high conductivity, self-supporting properties, and low cost. However, ordinary graphite paper has a tight bond between layers and a low surface are...

Claims

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Application Information

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IPC IPC(8): C01B32/21C01B32/22C25B1/135
CPCC01B32/21C01B32/22C25B1/135
Inventor 陈旭丽王林
Owner HUNAN UNIV
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