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Method capable of obtaining flexible graphene current collectors in batches

A technology of flexible graphite and current collectors, which is applied in the direction of graphene, chemical instruments and methods, electrode carriers/current collectors, etc., can solve problems such as low production efficiency, complicated processes, and complicated procedures, so as to ensure surface smoothness and process pressure Small, uniform effect

Inactive Publication Date: 2020-05-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To date, most of the procedures for fabricating flexible graphene films are complicated and costly, and the electrical conductivity of the resulting films is not ideal
In terms of cost, it is mainly constrained by the expensive materials used in traditional graphene preparation methods, the complexity of the process and the low yield efficiency, making it difficult to produce on a large scale

Method used

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  • Method capable of obtaining flexible graphene current collectors in batches
  • Method capable of obtaining flexible graphene current collectors in batches
  • Method capable of obtaining flexible graphene current collectors in batches

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for preparing a flexible graphene current collector includes the following steps:

[0035] Mix 1g of 50 mesh flake graphite with 25mL of 98% concentrated sulfuric acid solution by mass percentage for 5min at a stirring rate of 100r / min, and then add 7mL of 30% mass percentage hydrogen peroxide solution at 50r / min Stir at a speed of 30min, mix well and let stand at room temperature for 6 hours to puff and peel, wash to neutrality, and dry at 80℃ for 24 hours to obtain graphene powder; the obtained graphene powder is rolled at a roller press spacing of 20μm 30s into non-self-supporting flexible graphene paper; non-self-supporting flexible graphene paper is annealed in air at 450°C for 1h, and then rolled again at a roller press spacing of 20μm for 30s to obtain the final flexible graphene paper.

[0036] figure 2 Is the microscopic SEM image of the graphene powder obtained in Example 1, such as figure 2 As shown, it can be seen that after the original graphite is in...

Embodiment 2

[0040] A method for preparing a flexible graphene current collector includes the following steps:

[0041] Mix 1g of 200 mesh flake graphite with 15mL of 98% concentrated sulfuric acid solution for 5min at a stirring rate of 100r / min, then add 5ml of hydrogen peroxide solution with a mass percentage concentration of 30%, and stir for 30min at a speed of 50r / min After mixing uniformly, let stand at room temperature for 6 hours to puff and peel, wash to neutrality with water, and dry at 60°C for 72 hours to obtain graphene powder; the obtained graphene powder is rolled for 10 seconds at a roller press distance of 40 μm. Self-supporting flexible graphene paper; non-self-supporting flexible graphene paper is annealed in air at 450°C for 3 hours, and then rolled again for 10 seconds at a roller press distance of 40 μm to obtain the final flexible graphene paper.

[0042] The conductivity of the resulting graphene paper measured by the four-point resistance test method at room temperatur...

Embodiment 3

[0044] A method for preparing a flexible graphene current collector includes the following steps:

[0045] Stir and mix 0.2g of 50 mesh flake graphite with 5mL of concentrated sulfuric acid solution for 20min at a stirring rate of 100r / min. Then add 3ml of hydrogen peroxide solution with a mass percentage concentration of 30% and stir for 10min at a speed of 50r / min. After mixing uniformly, let stand at room temperature for 12 hours to puff and peel off. After washing to neutrality and drying at 80°C for 24 hours, graphene powder is obtained; the obtained graphene powder is rolled for 20s under a 20μm roller press distance. Supporting flexible graphene paper; non-self-supporting flexible graphene paper is annealed in air at 450°C for 3h, and then rolled again for 20s at a roller press distance of 20μm to obtain the final flexible graphene paper.

[0046] The conductivity of the obtained graphene paper measured by the four-point resistance test method at room temperature is 2.08×10 ...

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Abstract

The invention discloses a method capable of obtaining flexible graphene current collectors in batches. The method comprises the following steps: (1) mixing concentrated sulfuric acid and crystalline flake graphite so as to prepare a mixed solution; (2) adding hydrogen peroxide with a concentration of 30% into the mixed solution, carrying out stirring, then carrying out standing at a normal temperature, carrying out washing with water, and carrying out drying so as to obtain graphene powder; and (3) rolling the graphene powder into paper by using a rolling technology, then carrying out annealing, and carrying out rolling again so as to obtain flexible graphene paper. According to the preparation method for the flexible graphene current collectors provided by the invention, the flexible graphene current collectors with high conductivity, light weight and hydrophilicity can be obtained in batches by using rolling equipment through simple and low-cost puffing stripping and rolling technologies and preparation from powder to paper.

Description

Technical field [0001] The invention belongs to the field of self-supporting flexible graphene films, and specifically relates to a method for obtaining flexible graphene current collectors in batches. Background technique [0002] As the structure and part of collecting current, the current collector is an indispensable part of most electrochemical energy storage devices such as batteries and supercapacitors. A good current collector should be able to fully contact the active material and electrolyte, and its internal resistance should be as small as possible. The disadvantages of metal-based current collectors are that they are rigid, expensive, have a large specificity, and are prone to corrosion during long-term use, which will greatly affect the cost and performance of these batteries. On the other hand, these metal-based current collectors can hardly be used in energy storage systems, and the system has been widely regarded as one of the most promising solutions to the saf...

Claims

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Application Information

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IPC IPC(8): C01B32/19H01M4/66
CPCC01B2204/22C01B32/19H01M4/663Y02E60/10
Inventor 程爽母志鹏刘厅
Owner SOUTH CHINA UNIV OF TECH
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