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Method for preparing graphene used in battery

A graphene and graphene solution technology, applied in graphene, battery electrodes, secondary batteries, etc., can solve the problems of less composite interface and loose composite structure, and achieve controllable reaction process, short preparation cycle and simple process Effect

Inactive Publication Date: 2019-03-29
北京圣盟科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many ways to combine graphene and metal oxides, but most of the composite structures are loose, and there are relatively few studies on the mechanism of the composite interface.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Use 32 mesh natural flake graphite to prepare graphite oxide by modified Hummers method, prepare graphite oxide from flake graphite at 35°C and 2h, disperse graphite oxide in water, ultrasonic time is 10min, and ultrasonic power is 600W , and then remove visible particles by centrifuging at 3000rpm to obtain a graphene oxide solution;

[0025] (2) Preparation of Fe by solvothermal method 3 o 4 : First 1.35g FeCl 3 ·6H 2 O is dissolved in 25ml of ethylene glycol and stirred; then add 2.7g of sodium acetate and 1.0g of trisodium citrate and stir; 200°C, react for 10h. After cooling to room temperature, the reaction kettle was opened, and the precipitate was washed several times with ethanol and distilled water, and then dried in a vacuum oven at 25°C. After drying, Fe 3 o 4 nanoparticles;

[0026] A graphene oxide solution with a concentration of 1 mg / ml was mixed with 1 mg / ml Fe 3 o 4 After the solution is ultrasonically compounded for 30 minutes, it is heat...

Embodiment 2

[0030] Graphene oxide solution with Fe 3 o 4 The preparation method of nanoparticles is the same as in Example 1.

[0031] Fe at a concentration of 1 mg / ml 3 o 4 After the nanoparticles were surface-modified with 0.5 mg / ml trisodium citrate solution, 1 mg / ml graphene oxide solution was mixed with 1 mg / ml Fe 3 o 4 After the solution is ultrasonically compounded for 30 minutes, heat it to 100°C, put it into a test tube, and then put it into liquid nitrogen to quench until the solution is completely frozen, then freeze-dry it in situ, heat it to 100°C, put it into a test tube, and then put it into liquid nitrogen Quenching in the middle until the solution is completely frozen, then freeze-drying it in situ, and obtaining the graphene oxide nanoscroll material after drying, and then reducing it at 500°C under the protection of Ar gas to obtain the graphene nanoscroll iron oxide composite Material.

[0032] Originally, the graphene with strength 2 has fewer curly sheets, and ...

Embodiment 3

[0034] Graphene oxide solution with Fe 3 o 4 The preparation method of nanoparticles is the same as in Example 1.

[0035] Fe at a concentration of 1 mg / ml 3 o 4 After the nanoparticles were surface-modified with 1 mg / ml trisodium citrate solution, 1 mg / ml graphene oxide solution was mixed with 1 mg / ml Fe 3 o 4 After the solution is ultrasonically compounded for 30 minutes, heat it to 100°C, put it into a test tube, and then put it into liquid nitrogen to quench until the solution is completely frozen, then freeze-dry it in situ, heat it to 100°C, put it into a test tube, and then put it into liquid nitrogen Quenching in the middle until the solution is completely frozen, and then freeze-drying it in situ to obtain graphene oxide nanoscrolls, and then reducing it at 500°C under the protection of Ar to obtain graphene nanoscrolls iron oxide composite material.

[0036] The graphene curl sheet layer of present embodiment 3 is less, and Fe 3 o 4 The aggregate particle size...

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Abstract

The invention provides a method for preparing graphene used in a battery. The method comprises the specific steps: (1) preparation of a graphene oxide solution: using natural flake graphite as a raw material, and preparing graphite oxide by a modified Hummers method; performing ultrasonic dispersion on prepared graphite oxide in water, centrifuging the material to remove unpeeled graphite, and preparing a graphene oxide solution; (2) quenching of the graphene oxide solution in liquid nitrogen: performing compound ultrasonic treatment on the graphene oxide solution and a surfactant-added Fe3O4solution, heating and boiling the materials, and quenching the materials in the liquid nitrogen until the materials are completely frozen, and then performing in-situ freeze-drying to obtain the graphene oxide nano-rolls; and (3) graphene oxide nano-roller reduction: heating the dried graphene oxide nano-roll for reduction or performing chemical reduction to obtain a graphene nano-roll composite material. The method of the invention is simple and easy to control, has a short preparation period, and can realize low-cost macro preparation of graphene-based composite materials.

Description

technical field [0001] The invention relates to the field of graphene equipment, in particular to a method for preparing graphene used in batteries. Background technique [0002] Graphene, as a new type of carbon nanomaterial, has excellent electrical and mechanical properties and is expected to be used in lithium-ion batteries. However, graphene cannot be used alone because it has no obvious voltage platform, and it can be combined with traditional metal oxide anode materials to obtain electrode materials with both high specific capacity and high stability. At present, there are many ways to combine graphene and metal oxides, but most of the composite structures are loose, and there are relatively few studies on the mechanism of the composite interface. [0003] Therefore, taking the composite material of graphene and ferroferric oxide as the research object, and aiming at constructing a stable chemical interface between graphene and metal oxide in different composite stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/182C01B32/184H01M4/583H01M4/62H01M10/0525
CPCC01B32/182C01B32/184H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 王圣婴
Owner 北京圣盟科技有限公司
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