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Electrode with graphene-surface-activated micropores and preparation method of electrode

A graphene surface and microporous electrode technology, applied in the field of electrodes, can solve the problems of poor electrode conductivity and activity, and achieve the effects of improving conductivity and activity, relieving pressure, excellent conductivity and activity

Pending Publication Date: 2018-03-23
饶新元
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This application provides a graphene surface activated microporous electrode and its preparation method to solve the problems of poor electrical conductivity and poor activity of existing electrodes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] The second aspect of the present application provides a method for preparing a microporous electrode activated on the surface of graphene, which is used to prepare the electrode provided in the first aspect of the application. The inside of the electrode is provided with micropores, and the inner surface of the micropores is adhered to With graphene, the method comprises the steps of:

[0031] S1 heats the thermally volatile material to a molten state and atomizes it into particles;

[0032] Optionally, heat the thermally volatile material with a diameter of 0.5-5mm to 180-240°C to melt it, use the spray principle to atomize the melted thermally-volatile material into particles with a particle size of 10-50μm, and spray the particles Disperse into water or ethanol, and add coupling agent.

[0033] S2 mixing graphene and the microparticles in a solution added with a coupling agent to obtain a mixed solution;

[0034] Optionally, the graphene is added to water or ethano...

Embodiment 1

[0045] This embodiment provides a microporous electrode activated on a graphene surface, wherein micropores are arranged inside the electrode, and graphene is attached to the inner surface of the micropores. The micropores have a diameter of 10 μm. The sheet diameter of the graphene is 0.5 μm, and the thickness is 1 nm.

[0046] The electrode includes the following components by weight: 85 parts of lithium nickel cobalt manganese oxide, 5 parts of graphene, 5 parts of binder, 0.5 parts of coupling agent, and the electrode material is lithium nickel cobalt manganese oxide.

[0047] The present embodiment also provides a preparation method of a graphene surface-activated microporous electrode, which is used for the above-mentioned electrode, and the method comprises the following steps:

[0048] S1 heats the thermally volatile material to a molten state and atomizes it into particles.

[0049] Heat the EPS material with a diameter of 0.5mm to 180°C to melt it, use the spray pr...

Embodiment 2

[0062] This embodiment provides a microporous electrode activated on a graphene surface, wherein micropores are arranged inside the electrode, and graphene is attached to the inner surface of the micropores. The micropores have a diameter of 20 μm. The graphene has a sheet diameter of 2 μm and a thickness of 2 nm.

[0063] The electrode includes the following components in parts by weight: 90 parts of lithium iron phosphate, 2 parts of graphene, 2 parts of binder, and 2 parts of coupling agent.

[0064] The application also provides a method for preparing a graphene surface-activated microporous electrode, which is used for the above-mentioned electrode, and the method comprises the following steps:

[0065] S1 heats the thermally volatile material to a molten state and atomizes it into particles.

[0066] Heat the EPP material with a diameter of 1.5mm to 200°C to melt it, use the spray principle to atomize the molten EPP material into particles with a particle size of 20 μm...

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Abstract

The invention relates to the technical field of electrodes, in particular to an electrode with graphene-surface-activated micropores. The electrode is characterized in that the micropores are arrangedinside the electrode, and graphene attaches to the inner surfaces of the micropores. The electrode has the advantages that due to the fact the graphene is added to the electrode, the electrode is excellent in conductivity and activity as compared with an existing electrode; the specific surface area of the electrode is increased by the micropores in the electrode, the ion transmission channels inthe electrode by the graphene attaching to the inner surfaces of the micropores, and the conductivity and activity of the electrode are further increased; meanwhile, the micropores effectively relieve pressure brought by the volume expansion of the electrode, the stability of the electrode is increased, and the service life of the electrode is prolonged; the electrode is good in rate capability and promising in application prospect.

Description

technical field [0001] The present application relates to the technical field of electrodes, in particular to a graphene surface-activated microporous electrode and a preparation method thereof. Background technique [0002] Lithium-ion battery has many advantages such as high energy density, high power, low self-discharge rate, no memory effect and environmental protection. It is considered to be the most potential system in the mobile energy storage system and has been widely used in mobile phones, MP4, cameras, etc. , notebook computers and other electronic consumer products. [0003] Lithium-ion batteries include positive electrode materials, electrolytes, separators, and negative electrode materials. When the battery is charged, lithium ions are generated on the positive electrode of the battery, and the generated lithium ions move to the negative electrode through the electrolyte and are stored in the negative electrode to store electricity. The electrode of a lithiu...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/136H01M4/1391H01M4/1397H01M4/62H01M10/0525
CPCH01M4/131H01M4/136H01M4/1391H01M4/1397H01M4/621H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 饶新元
Owner 饶新元