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Graphene preparation method

A graphene and graphite intercalation technology, applied in the field of graphene, can solve the problems of difficulty in obtaining lamellae, a small number of lamellae, and high manufacturing costs, so as to reduce potential safety hazards and environmental pollution, mild peeling reactions, and reduce the generation process. Effect

Inactive Publication Date: 2015-09-09
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of assembling electrodes into batteries, the manufacturing cost is high, and the two-dimensional graphene sheets generated after peeling off are easy to re-stack together, so it is difficult to obtain the number of sheets when preparing graphene by this method. few products
[0006] In view of this, it is necessary to develop a new graphene preparation method to solve the safety hazards and environmental pollution problems in the preparation process, and at the same time realize the large-scale, low-cost, and industrialized preparation of graphene with a small number of sheets.

Method used

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  • Graphene preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Preparation of working electrode: prepare slurry according to the quality relationship of expanded graphite: super conductive carbon: styrene-butadiene rubber = 96:3:1, and then apply it on the copper foil current collector to prepare working electrode;

[0040] Preparation of the auxiliary electrode: Prepare the slurry according to the quality relationship of lithium iron phosphate: conductive carbon black: polyvinylidene fluoride = 95:4:1, and then apply it on the aluminum foil current collector to prepare the auxiliary electrode;

[0041] Assembly: The working electrode and the auxiliary electrode are cut into the same shape, and then assembled directly, so that the working layer and the auxiliary layer are completely corresponding, and the pre-reaction body is obtained.

[0042] The preparation of graphene reactant: with propylene carbonate: dimethyl carbonate = 1:1 mixed solution as solvent, 1mol / L lithium hexafluorophosphate as solute solution as initial electrolyt...

Embodiment 2

[0044] Embodiment 2, different from Embodiment 1, this embodiment includes:

[0045] Preparation of working electrode: prepare slurry according to the quality relationship of expanded graphite: super conductive carbon: styrene-butadiene rubber: polyvinyl pyrrolidone=75:4:1:20, and then apply it on the copper foil current collector to prepare working electrode;

[0046] Preparation of the graphene reactant: using a mixture of propylene carbonate: diethyl carbonate = 1:1 as a solvent, and a solution of 1.1 mol / L lithium hexafluorophosphate as a solute as an electrolyte (reaction solution). The electrolyte is injected into the pre-reaction body, and after it is fully infiltrated, the pre-reaction body is placed in an environment of 150 ° C, and a surface pressure of 1 MPa is applied at the same time, so that ion channels and electronic channels are formed between the expanded graphite and lithium iron phosphate at the same time. The exfoliation of the expanded graphite can be car...

Embodiment 3

[0048] Embodiment 3, the preparation of working electrode: according to artificial graphite: super conductive carbon: styrene-butadiene rubber: phosphoric acid ester=95:3:1:1 mass relation prepares slurry, is coated on the copper foil current collector afterwards and prepares to obtain working electrode electrode;

[0049] Preparation of the auxiliary electrode: Prepare the slurry according to the mass relationship of lithium cobaltate: conductive carbon black: polyvinylidene fluoride = 95:4:1, and then apply it on the aluminum foil current collector to prepare the auxiliary electrode;

[0050] Assembly: The working electrode and the auxiliary electrode are cut into the same shape, and then assembled directly, so that the working layer and the auxiliary layer are completely corresponding, and the pre-reaction body is obtained.

[0051] The preparation of graphene reactant: with propylene carbonate: diethyl carbonate = 1:1 mixed solution as solvent, 1mol / L lithium hexafluoropho...

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Abstract

The invention belongs to the technical field of preparation of graphene, and in particular, relates to a graphene preparation method. A working layer containing a carbon material is attached on a working current collector to obtain a working electrode; an auxiliary layer containing a power source substance is attached on an auxiliary current collector to obtain an auxiliary electrode; the working electrode and the auxiliary electrode are directly assembled to obtain a pre-reaction body, so that the working layer and the auxiliary layer make direct contact (capable of being electronically conducted); and finally, electrolyte is injected between the working layer and the auxiliary layer, so that the working layer and the auxiliary layer are in ion conduction. Under the condition of synchronous conduction of an ion channel and an electronic channel, a graphite stripping reaction is spontaneously performed to prepare the graphene; and meanwhile, the graphene with a small lamella number can be industrially prepared in large batches with low cost.

Description

technical field [0001] The invention belongs to the technical field of graphene, in particular to a preparation method of graphene. Background technique [0002] In 2004, Andre K. Geim of the University of Manchester in the United Kingdom prepared graphene for the first time by mechanical exfoliation, which opened the prelude to the preparation and application of this material. The so-called graphene refers to a sheet-like body in which carbon atoms are arranged in a hexagonal ring, usually consisting of a single layer or multiple layers of graphite sheets, which can be infinitely extended in a two-dimensional space. Structural materials. It has outstanding advantages such as large specific surface area, excellent electrical and thermal conductivity, and low thermal expansion coefficient: specifically, high specific surface area (theoretical calculation value: 2630m 2 / g); high conductivity, carrier transport rate (200000cm 2 / V·s); high thermal conductivity (5000W / mK); h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00C01B31/04
CPCC25B1/00C01B32/184
Inventor 杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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