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Preparation method for porous graphene micro-sheet

A porous graphene and microchip technology, applied in the field of graphene, can solve the problems of low lithium ion mobility, inability to form three-dimensional lithium ion channels, limit battery capacity and rate performance, etc., to increase the diffusion rate and be suitable for large-scale The effect of abundant production and raw materials

Inactive Publication Date: 2016-03-30
FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For lithium-ion batteries, its high electron mobility is conducive to the transport of electrons, but its stable planar structure limits the transfer of Li+ between graphene planes, and cannot form effective three-dimensional lithium ion channels, so it has a lower The mobility of lithium ions limits the performance of battery capacity and rate performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A preparation method for porous graphene microsheets, comprising the steps of:

[0015] 1) Pretreatment of graphite:

[0016] Put graphite in a mixed solution composed of oxidant and intercalation agent, and ultrasonically stir it at 20°C for 5h. Under treatment for 6 hours, the expanded graphite product is obtained for use; the oxidizing agent is hydrogen peroxide; and the intercalation agent is sulfuric acid.

[0017] 2) Preparation of porous graphene microsheets:

[0018] Dissolve the expanded graphite obtained in the previous step in a certain amount of deionized water, add 0.1wt% surfactant, stir ultrasonically for 0.5h, then add a certain amount of pore-forming agent, the mass ratio of pore-forming agent to expanded graphite is: 0.1 : 1, continue ultrasonic stirring for 5h, then evaporate the solvent at a temperature of 100°C, and place the obtained solid under N 2 In the muffle furnace under the protection of the atmosphere, treat at a high temperature of 1200...

Embodiment 2

[0020] A preparation method for porous graphene microsheets, comprising the steps of:

[0021] 1) Pretreatment of graphite:

[0022] Graphite is placed in a mixed solution composed of oxidant and intercalation agent, and treated with ultrasonic stirring at 60°C for 3h. Under treatment for 6 hours, the expanded graphite product is obtained for later use; the oxidizing agent is potassium permanganate; the intercalation agent is acetic acid.

[0023] 2) Preparation of porous graphene microsheets:

[0024] Dissolve the expanded graphite obtained in the previous step in a certain amount of deionized water, add 2wt% surfactant, stir ultrasonically for 2 hours, then add a certain amount of pore-forming agent, the mass ratio of pore-forming agent to expanded graphite is: 1:1 , continued ultrasonic stirring for 1 h, then evaporated the solvent at a temperature of 100 ° C, and placed the obtained solid in N 2 In the muffle furnace under the protection of the atmosphere, treat it at a...

Embodiment 3

[0026] A preparation method for porous graphene microsheets, comprising the steps of:

[0027] 1) Pretreatment of graphite:

[0028] Graphite is placed in a mixed solution composed of oxidant and intercalation agent, and treated with ultrasonic stirring at 30°C for 5h. Under treatment for 3 hours, the expanded graphite product was obtained for later use; the oxidizing agent was ammonium persulfate; the intercalation agent was nitric acid.

[0029] 2) Preparation of porous graphene microsheets:

[0030] Dissolve the expanded graphite obtained in the previous step in a certain amount of deionized water, add 1wt% surfactant, stir ultrasonically for 1 hour, and then add a certain amount of pore-forming agent. The mass ratio of pore-forming agent to expanded graphite is: 0.5:1 , continue ultrasonic stirring for 3h, then evaporate the solvent at a temperature of 100°C, and place the obtained solid under N 2 In the muffle furnace under the protection of the atmosphere, treat it at...

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Abstract

The invention discloses a preparation method for a porous graphene micro-sheet. The preparation method is characterized by comprising the following steps: 1) pretreatment of graphite: putting graphite into a mixed solution consisting of an oxidizing agent and intercalator, performing ultrasonic stirring for 3-5h; washing, filtering and drying the obtained product, and putting the product into a muffle furnace, and processing the product in nitrogen atmosphere at a high temperature of 600-1,200 DEG C for 2-6h to obtain an expanded graphite product for use; and 2) preparation of the porous graphene micro-sheet: dissolving the expanded graphite obtained in the above step into a certain amount of deionized water, adding 0.1-2wt% of surfactant, performing ultrasonic stirring for 0.5-2h, and then adding a certain amount of pore forming agent, and putting into the muffle furnace under the N2 protective atmosphere for processing for 1-3h; washing the obtained product by dilute acid or dilute alkali and the deionized water solution for multiple times; drying the product in a vacuum drying oven for 2-6h to obtain the porous graphene micro-sheet. The porous graphene micro-sheet prepared by the preparation method provided by the invention is relatively high in specific surface area (850-1,000 m2 / g); and due to the porous structure, the diffusion rate of the lithium ions can be improved, and a relatively better electrochemical performance can be obtained.

Description

technical field [0001] The invention relates to the technology in the field of graphene, and in particular provides a method for preparing porous graphene microchips. Background technique [0002] The special two-dimensional planar structure of graphene endows it with excellent electronic conductivity, and the electron mobility on its surface can reach 2.5×105cm2 / V, which is 100 times that of silicon. And it can withstand the current density of 1~2×108A / cm2. These properties make it have a very wide application prospect in the field of high-performance electronic devices and battery materials. For lithium-ion batteries, its high electron mobility is conducive to the transport of electrons, but its stable planar structure limits the transfer of Li+ between graphene planes, and cannot form effective three-dimensional lithium ion channels, so it has a lower The mobility of lithium ions limits the performance of battery capacity and rate performance. Therefore, it is an impor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/133H01M4/1393H01M10/0525
CPCH01M4/133H01M4/1393H01M4/583H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 宋宏芳赵东辉李芳戴涛周鹏伟
Owner FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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