Method for preparing high-density graphene electrode material for lithium-ion capacitor

A graphene electrode, high-density technology, used in hybrid capacitor electrodes, hybrid/electric double-layer capacitor manufacturing, capacitors, etc., can solve the problems of small batch preparation, complex preparation conditions and methods, and limited preparation efficiency. The effect of reducing production costs, simplifying preparation conditions and methods, and improving production efficiency

Inactive Publication Date: 2019-06-04
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the main problem in the existing preparation technology: 1) batch preparation amount is less
2) The preparation conditions and methods are more complicated
The existing process requires post-processing and controlled drying conditions, which greatly limits the production efficiency

Method used

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  • Method for preparing high-density graphene electrode material for lithium-ion capacitor
  • Method for preparing high-density graphene electrode material for lithium-ion capacitor
  • Method for preparing high-density graphene electrode material for lithium-ion capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of preparation method of high-density graphene electrode material for lithium ion capacitor, its technological process:

[0026] Oxidize the graphene powder in 1% nitric acid solution for 12 hours, then mix it with the graphite oxide ultrasonic vibration dispersion for 12 hours, transfer the precursor solution into a hydrothermal kettle, and continue heating at 180°C for 24 hours, and directly prepare the obtained graphite The graphene gel is dried at normal pressure, and the drying method is a step drying method: bake at 40°C for 24 hours, then bake at 100°C for 6 hours, and then pulverize to obtain high-density graphene powder, which is then used as the positive electrode of a lithium ion capacitor Materials are tested for electrical properties.

Embodiment 2

[0028] A kind of preparation method of high-density graphene electrode material for lithium ion capacitor, its technological process:

[0029] Oxidize the graphene powder in a 60% phosphoric acid solution for 1 hour, then mix it with the graphite oxide ultrasonic vibration dispersion for 12 hours, transfer the precursor liquid into a hydrothermal kettle, and continue heating at 150°C for 12 hours, and directly prepare the obtained graphite The graphene gel is dried at normal pressure, and the drying method is a step drying method: bake at 60°C for 12 hours, then bake at 100°C for 12 hours, and then pulverize to obtain high-density graphene powder, which is then used as the positive electrode of a lithium ion capacitor Materials are tested for electrical properties.

Embodiment 3

[0031] A kind of preparation method of high-density graphene electrode material for lithium ion capacitor, its technological process:

[0032] Oxidize the graphene powder in 50% perchloric acid solution for 1 hour, then mix it with the graphite oxide ultrasonic vibration dispersion for 12 hours, transfer the precursor solution into a hydrothermal kettle, continue heating at 200°C for 6 hours, and directly The obtained graphene gel is dried at normal pressure, and the drying method is a step drying method: bake at 60°C for 12 hours, then bake at 100°C for 6 hours, and then pulverize to obtain high-density graphene powder, which is then used as a lithium ion Capacitor cathode material for electrical performance testing.

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Abstract

The invention relates to a method for preparing a high-density graphene electrode material for a lithium-ion capacitor and belongs to the technical field of graphene electrode materials. The method comprises the steps of performing an oxidation treatment on graphene powder, mixing oxidized graphene powder with an oxidized graphite dispersion liquid, transferring the precursor liquid into a hydrothermal kettle after stirring and ultrasonical dispersion, continuously heating at the temperature of 150 DEG C to 200 DEG C for 6 to 24 hours, and drying an obtained graphene gel by a step drying method to obtain the high-density powder graphene electrode material. According to the method, the pre-order feeding amount and the preparation amount are increased, the preparation conditions and methodsare simplified, the high-density graphene has no obvious diffraction peak in an X-ray diffraction spectrum and has short-range order and long-range disorder, while the production efficiency is improved, the production cost is reduced, and the method is very suitable for the large-scale production of graphene.

Description

technical field [0001] The invention belongs to the technical field of graphene electrode materials, in particular to a method for preparing high-density graphene electrode materials for lithium ion capacitors. Background technique [0002] Graphene is composed of sp with hexagonal structure 2 A two-dimensional monolayer film composed of hybridized carbon atoms. Due to the unique structure of graphene, it has the above-mentioned unique properties, such as super large specific surface area, good electronic conductivity and excellent optical properties. And such excellent carbon materials are also destined to play an indelible role in improving the performance of chemical power sources such as lithium-ion batteries, electrochemical capacitors, and fuel cells in various forms. For graphene materials, its super large specific surface area is its advantage under certain conditions, but the disadvantage brought by its super large specific surface area is extremely low tap densit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/36H01G11/06
CPCY02E60/13
Inventor 宗军丁飞纪伟伟赵彪高森森许寒倪旺刘兴江
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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