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Use method of graphene film in sodium ion battery and preparation method of graphene film

A technology of graphene film and sodium ion battery, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems such as small and difficult to realize sodium ion deintercalation, and achieve the effect of reducing raw material cost, small surface area, and simple process technology

Pending Publication Date: 2022-06-14
GUANGDONG MORION NANOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the problem that the traditional artificial graphite negative electrode material has a small layer spacing and it is difficult to realize the deintercalation of sodium ions, the present invention has developed a self-supporting layered graphene film with an ideal layer spacing as a negative electrode material for sodium ion batteries.

Method used

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  • Use method of graphene film in sodium ion battery and preparation method of graphene film

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Effect test

Embodiment 1

[0037] The preparation method of a self-supporting layered graphene sodium ion film negative electrode proposed by the present invention, the specific steps are as follows:

[0038] 1) The flake graphene is oxidized to graphene oxide with higher monolayer rate using the modified Hummers oxidation method.

[0039] S1. Select 3g of flake graphite (500 mesh) as the raw material, add 24ml of concentrated sulfuric acid, and slowly add K after fully stirring 2 S 2 O 8 , P 2 O 5 5g each, stir evenly, heat to 80°C, keep the temperature for 4.5h, and carry out pre-oxidation;

[0040] S2, then add 120ml of concentrated sulfuric acid, stir again and slowly add 15g KMnO dropwise 4 , put it in a low temperature environment (35°C) and slowly stir for 2h, add 250ml of deionized water, and continue to stir at 35°C for 2h, the solution is dark green at this time;

[0041] S3. Finally, slowly add 720ml of H with a mass fraction of 0.83% under stirring conditions. 2 O 2 , a bright yellow...

Embodiment 2

[0050] The difference between this embodiment and Embodiment 1 is that the graphene film is not perforated, and other steps are the same as those of Embodiment 1.

[0051] 1) The flake graphene is oxidized to graphene oxide with higher monolayer rate using the modified Hummers oxidation method.

[0052] S1. Select 3g of flake graphite (500 mesh) as the raw material, add 24ml of concentrated sulfuric acid, and slowly add K after fully stirring 2 S 2 O 8 , P 2 O 5 5g each, stir evenly, heat to 80°C, keep the temperature for 4.5h, and carry out pre-oxidation;

[0053] S2, then add 120ml concentrated sulfuric acid, stir again and slowly add 15g KMnO dropwise 4 , put it in a low temperature environment (35°C) and slowly stir for 2h, add 250ml of deionized water, and continue to stir at 35°C for 2h, the solution is dark green at this time;

[0054] S3. Finally, slowly add 720ml of H with a mass fraction of 0.83% under stirring conditions. 2 O 2 , a bright yellow graphene oxi...

Embodiment 3

[0063] The difference between this embodiment and Embodiment 1 is that in step 5), the hole radius of the laser penetration drilling is designed to be 0.1 mm, and other steps are the same as those of Embodiment 1.

[0064] 1) The flake graphene is oxidized to graphene oxide with higher monolayer rate using the modified Hummers oxidation method.

[0065] S1. Select 3g of flake graphite (500 mesh) as the raw material, add 24ml of concentrated sulfuric acid, and slowly add K after fully stirring 2 S 2 O 8 , P 2 O 5 5g each, stir evenly, heat to 80°C, keep the temperature for 4.5h, and carry out pre-oxidation;

[0066] S2, then add 120ml concentrated sulfuric acid, stir again and slowly add 15g KMnO dropwise 4 , put it in a low temperature environment (35°C) and slowly stir for 2h, add 250ml of deionized water, and continue to stir at 35°C for 2h, the solution is dark green at this time;

[0067] S3. Finally, slowly add 720ml of H with a mass fraction of 0.83% under stirring...

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Abstract

The invention discloses a use method of a graphene film in a sodium ion battery negative electrode and a preparation method of the graphene film, the graphene film comprises multiple layers of stacked two-dimensional graphene sheets, and the interlayer spacing D of the two-dimensional graphene sheets is greater than the diameter of sodium ions; a plurality of holes are formed in the graphene film in the thickness direction, and sodium ions are transversely embedded into / separated from the interlayer of the multilayer stacked two-dimensional graphene sheet from the edge cross section of the graphene film or the cross sections of the holes in the charging and discharging process; and cutting the longitudinal hole-modified graphene film, and directly applying the cut longitudinal hole-modified graphene film as a negative electrode in the sodium ion battery. Compared with a traditional carbon-based negative electrode material, the 3D thin film which is regularly and transversely arranged is obtained through methods of oxidation stripping and reduction recombination, more ideal interlayer distance is achieved, sodion deintercalation is facilitated, a large number of transverse deintercalation sites are provided for sodion deintercalation through perforating modification, and the steric hindrance of graphene to sodions is broken.

Description

technical field [0001] The invention relates to the field of sodium ion negative electrodes, in particular to a method for using a graphene film as a negative electrode in a sodium ion battery and a preparation method thereof. Background technique [0002] With the rapid development of the new energy industry, especially new energy vehicles, energy demand is increasing rapidly. For such a huge energy application demand, it is very important to develop a low-cost and sustainable energy storage technology. The current mainstream energy storage system is lithium-ion batteries, and lithium is a rare and precious resource. Its global reserves are very limited, only 0.002%, and the distribution is uneven and the development cost is high. In addition, with the rapid development of the new energy vehicle industry, the price of lithium resources has risen sharply and there is a shortage of lithium resources, which cannot meet the demand for large-scale energy storage in the future. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/054H01M4/133H01M4/1393
CPCH01M10/054H01M4/133H01M4/1393
Inventor 蔡金明陈其赞梁惠明
Owner GUANGDONG MORION NANOTECHNOLOGY CO LTD
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