Preparation method of skin-core structure graphite felt electrode material

A skin-core structure and electrode material technology, which is applied to battery electrodes, structural parts, circuits, etc., can solve the problems of unsatisfactory flow battery electrode materials, reduced active group content, and reduced strength, so as to improve energy utilization. Improvement of activity and wettability, performance improvement effect

Inactive Publication Date: 2015-08-26
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Graphite felt mainly plays the role of providing an electrochemical reaction place in the liquid flow battery, and it is required to have high activity and certain strength. After the pre-oxygen felt is completely carbonized and graphitized, the content of active groups on the surface of the graphite fiber decreases. , and the strength is obviously reduced, and the slag phenomenon is serious, which cannot meet the needs of the electrode material of the flow battery

Method used

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  • Preparation method of skin-core structure graphite felt electrode material

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Effect test

Embodiment 1

[0022] The 3mm thick pre-oxygen felt was carbonized in vacuum at 800°C for 200h to incompletely carbonize the fibers. After that, graphitization is carried out. This process is carried out at 1800°C in vacuum, and the graphitization time is kept at 240h to achieve incomplete graphitization, so that the fiber has a skin-core structure. The obtained incompletely graphitized graphite felt was placed in an air atmosphere and oxidized at 400°C for 8 hours to obtain the required graphite felt electrode material.

Embodiment 2

[0024] Put the 6mm thick pre-oxygen felt in N 2 Carbonize at 1000°C for 100h to incompletely carbonize the fibers. followed by graphitization, a process in which the N 2 It is carried out at 2000°C, and the graphitization time is kept at 120h to achieve incomplete graphitization, so that the fiber has a skin-core structure. Soak the above-mentioned graphite felt in the isopropanol solution with a concentration of 2mol / L, and then perform plasma treatment on it, graft the hydroxyl groups in the isopropanol to the fiber surface of the graphite felt, and finally obtain the required graphite felt electrode material .

Embodiment 3

[0026] The 10mm thick pre-oxygen felt was carbonized in Ar at 1300°C for 30h to incompletely carbonize the fibers. After that, graphitization is carried out. This process is carried out at 2300 ° C in Ar, and the graphitization time is kept at 60 hours to achieve incomplete graphitization, so that the fiber has a skin-core structure. Put the above-mentioned graphite felt in the air atmosphere, oxidize it at 600°C for 5h, after it cools down, soak it in the mixed solution of 2mol / L isopropanol and 1mol / L acetic acid, and then carry out the above-mentioned infiltrated graphite felt By plasma treatment, the hydroxyl group in isopropanol and the carboxyl group in acetic acid are grafted onto the fiber surface of graphite felt, and finally the required graphite felt electrode material is obtained.

[0027] It is found through testing that the slag dropping phenomenon of the prepared graphite felt is significantly improved, and the content of oxygen-containing active groups on the f...

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Abstract

The invention provides a method for preparing a graphite felt electrode material with a skin-core structure. The preparation method is characterized by comprising the following steps: (1) performing incomplete carbonization on a pre-oxidation felt to obtain a carbon felt; (2) performing incomplete graphitization on the carbon felt to obtain a graphite felt; (3) performing surface modification on the fibers of the graphite felt so as to obtain the graphite felt electrode material with the skin-core structure. According to the preparation method provided by the invention, the intensity of the graphite felt is ensured, residues are prevented from falling off, the production costs are reduced, and the production efficiency is improved; in addition, the content of surface active groups of graphite fibers is improved greatly, so that the activity and wetting property of the graphite felt are improved.

Description

technical field [0001] The invention belongs to the field of electrode material preparation, and in particular relates to a preparation method of a skin-core structure graphite felt electrode material. Background technique [0002] With the development and utilization of renewable energy such as solar energy and wind energy, the research and development of large-scale and high-efficiency energy storage technology has become an international hot spot. Driven by strong social development needs and a huge potential market, large-scale, high-efficiency, long-life, low-cost, and pollution-free flow batteries have ushered in a new period of vigorous development. The positive and negative active materials (electrolyte) of the flow battery are stored in two liquid storage tanks respectively. The liquid storage tanks are respectively connected to the battery and the pump. During operation, the electrolyte is pumped into the battery through the pump to circulate the electrolyte. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 谭毅李倩施伟张欢
Owner DALIAN UNIV OF TECH
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