Graphene modification current collector prepared by employing plasma-assisted chemical vapor deposition and preparation method thereof

An auxiliary gas and graphene technology, applied in the field of electrochemical energy storage, can solve the problems of graphene dispersion and processing, the influence of graphene coating conductivity, and cumbersome preparation methods, so as to improve high power performance and cycle Stability and life, the effect of simple preparation process

Inactive Publication Date: 2019-06-28
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method is cumbersome, and there are many problems in the dispersion and processing of graphene, and the dispersant and binder in the graphene slurry have a great influence on the conductivity of the graphene coating.

Method used

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  • Graphene modification current collector prepared by employing plasma-assisted chemical vapor deposition and preparation method thereof
  • Graphene modification current collector prepared by employing plasma-assisted chemical vapor deposition and preparation method thereof
  • Graphene modification current collector prepared by employing plasma-assisted chemical vapor deposition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of graphene aluminum foil current collector:

[0035] First, place the glass substrate in a tube furnace and pass H 2 (20sccm) and turn on the vacuum pump, start heating when the air pressure is 30Pa, the tube furnace heats up at a heating rate of 10°C / min, and after reaching the predetermined reaction temperature of 600°C, turn on the RF power supply, adjust the power supply to 300W, and generate hydrogen plasma in the quartz tube ; followed by CH 4 (5sccm), grow one deck graphene on aluminum foil surface after reacting 60min; Graphene film thickness is about 900nm.

[0036] The graphene-modified aluminum foil current collector of this embodiment is assembled into a button battery with a conventional aluminum foil current collector for rate performance test comparison (see image 3 ). Specifically, assembling the graphene aluminum foil current collector (or conventional aluminum foil current collector) obtained in this embodiment into a button battery in...

Embodiment 2

[0038] The preparation method is basically the same as in Example 1, and the difference is: in step (1), hydrogen H 2 (10 sccm), CH 4 (10sccm), the power supply is 200W, and the reaction is 20min. The prepared graphene film thickness is 300nm.

Embodiment 3

[0040] The preparation method is basically the same as in Example 1, and the difference is: in step (1), hydrogen H 2 (5 sccm), CH 4 (1sccm), power supply is 200w, reacts 30min; The graphene film thickness of preparation is 300nm.

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Abstract

The present invention relates to a graphene modification current collector prepared by employing plasma-assisted chemical vapor deposition and a preparation method thereof. The graphene modification current collector comprises a substrate and a grapheme thin film having a three-dimensional continuous structure formed by mutual connection of grapheme nanosheets vertically grown at the surface of the substrate. The graphene modification current collector can effectively reduce the internal resistance of an electrode and can improve the high-power performance of the battery.

Description

technical field [0001] The invention relates to a graphene-modified current collector prepared by plasma-assisted chemical vapor deposition (PECVD) and a preparation method thereof, belonging to the field of electrochemical energy storage. Background technique [0002] Lithium-ion batteries use aluminum foil as the positive electrode current collector. As an important part of the lithium-ion battery electrode, the surface of the aluminum foil is coated with active materials, which are responsible for collecting the electrons generated by the positive active materials to the external circuit to form a current. Therefore, the current collector base material (such as aluminum foil) has a direct impact on the performance of the battery. [0003] Taking aluminum foil as an example, the performance of batteries can be effectively improved by studying the surface modification of aluminum foil. For example, acid-base corrosion modification is carried out on the surface of aluminum ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/0525
CPCY02E60/10
Inventor 黄富强黄丙娣唐宇峰李永鸿刘战强李斌郑立娟陈志雄
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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