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A kind of graphene and its preparation method, and its application in lithium-ion battery positive electrode conductive agent

A graphene and graphite sheet technology, applied in the field of graphene, can solve the problems of low intercalation reaction and exfoliation reaction efficiency, reduced lithium-ion battery cycle performance, low graphene purity, etc., achieves good application prospects and solves safety problems and environmental pollution problems, the effect of low impurity content

Active Publication Date: 2017-08-01
RIGHTFUL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is simple to operate and low in cost, but the efficiency of the intercalation reaction and stripping reaction in this method is low, and the obtained graphene has low purity, and when used as a lithium-ion battery material, the internal resistance is large, which will reduce the lithium ion density. Cycle Performance of Ion Batteries

Method used

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  • A kind of graphene and its preparation method, and its application in lithium-ion battery positive electrode conductive agent
  • A kind of graphene and its preparation method, and its application in lithium-ion battery positive electrode conductive agent

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The preparation method of the graphene of the present embodiment comprises the steps:

[0030] 1) Add 30g of anthracite carbon material containing graphite lamellar structure, 70g of electrolyte solution, 1g of auxiliary agent ferric chloride and 3g of lithium metal powder into the reaction vessel, stir fully, and mix evenly to prepare a reaction slurry; the electrolyte solution includes Solute and solvent, the solute is lithium hexafluorophosphate, the concentration in the electrolyte solution is 1mol / L, and the solvent is a mixed solvent formed by mixing propylene carbonate and dimethyl carbonate according to a volume ratio of 1:1;

[0031] 2) Heating the reaction slurry obtained in step 1) to 150°C with microwaves and keeping it warm for 5 minutes, and then ultrasonically oscillating to make the anthracite particles fully contact with the lithium metal powder, forming an electronic channel between the two, and simultaneously The ion channel is also formed through the...

Embodiment 2

[0036] The preparation method of the graphene of the present embodiment comprises the steps:

[0037] 1) Add 1g of anthracite carbon material containing graphite lamellar structure, 50g of electrolyte solution, 1g of additive formic acid and 1g of lithium metal powder into the reaction vessel, stir fully, mix evenly, and prepare a reaction slurry; wherein the electrolyte solution includes solute and Solvent, solute is lithium perchlorate, and the concentration in electrolytic solution is 1mol / L, and solvent is the mixed solvent that propylene carbonate and ethyl methyl carbonate mix according to volume ratio 0.5:1;

[0038] 2) Heat the reaction slurry obtained in step 1) to 50°C with microwaves and keep it warm for 10 minutes, then perform centrifugal stirring to make the anthracite particles fully contact with the lithium metal powder, an electronic channel is formed between the two, and at the same time The ion channel is also formed through the electrolyte, and the graphite...

Embodiment 3

[0043] The preparation method of the graphene of the present embodiment comprises the steps:

[0044]1) Add 50g of anthracite carbon material containing graphite sheet structure, 100g of electrolyte solution, 1g of auxiliary agent acetic acid and 5g of lithium metal powder into the reaction vessel, fully stir, and mix uniformly to prepare a reaction slurry; wherein the electrolyte solution includes solute and Solvent, solute is lithium perchlorate, and the concentration in electrolytic solution is 1mol / L, and solvent is the mixed solvent that dimethyl carbonate and ethyl methyl carbonate mix according to volume ratio as 2:1;

[0045] 2) Heating the reaction slurry obtained in step 1) to 300°C with microwaves and keeping it warm for 1 min, and then performing centrifugal stirring to make the anthracite particles fully contact with the lithium metal powder, forming an electronic channel between the two, and at the same time The ion channel is also formed through the electrolyte,...

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Abstract

The invention relates to graphene and a preparation method thereof, as well as application to a lithium battery cathode conductive agent, and belongs to the technical field of graphene. The preparation method comprises the following steps: uniformly mixing a carbon material containing a graphite lamella structure, an electrolyte solution, one or more additives and metal lithium to prepare a reaction slurry, wherein the electrolyte solution comprises a solute and one or two solvents, the solute is any one of a lithium salt, a sodium salt, a magnesium salt and a calcium salt, the solvents comprise a chain carbonic ester and / or a cyclic carbonic ester, and the additives comprise one or more of formic acid, acetic acid, ferric chloride and nitric acid; conducting disturbance treatment on the obtained reaction slurry, and carrying out graphite lamella stripping to obtain a primary pulp of graphene; soaking the primary pulp of graphene in a lithium carbonate solution, and carrying out cleaning and drying to obtain graphene. The preparation method is low in cost and high in efficiency; graphene prepared according to the method is large in specific surface area, and can be utilized for reducing the internal resistance of a battery and improving the cycle performance.

Description

technical field [0001] The invention relates to a graphene, a preparation method thereof, and an application in the positive electrode conductive agent of a lithium ion battery, belonging to the technical field of graphene. Background technique [0002] Graphene is considered an ideal material for its large specific surface area, excellent electrical and thermal conductivity and low thermal expansion coefficient, especially its good electrical conductivity and large specific surface, coupled with its monomolecular layer two Dimensional nanoscale structural features are very suitable for use as electrode materials in supercapacitors and lithium-ion batteries. [0003] There are several methods for preparing graphene in the prior art: micromechanical exfoliation method, which can only produce a very limited number of graphene sheets, and is difficult to industrialize; ultra-high vacuum graphene epitaxial growth method, this method is because The high cost and the small disc s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19C01B32/194H01M4/62H01M10/0525
CPCY02E60/10
Inventor 程先桃
Owner RIGHTFUL TECH