Graphite felt watch surface modified method and modified mineral carbon felt

A surface modification, graphite felt technology, applied in electrode manufacturing, electrical components, circuits, etc., can solve the problem that there is no modification treatment method that can improve the water wettability and electrochemical activity of graphite felt at the same time, and the electrochemical performance of electrodes is not ideal. , poor electrochemical activity of graphite felt electrodes, etc., to achieve the effect of improving electrochemical activity, increasing stable discharge time, and simple and easy operation

Inactive Publication Date: 2008-05-21
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, method ①②③, especially method ③ can improve the wettability and electrochemical activity of graphite felt, and do not introduce new elements into the system, but the electrochemical performance of the electrode is still not ideal, mainly in the graphite felt electrode. Poor electrochemical activity and insufficient voltage efficiency during battery charge and discharge
The electrode modified

Method used

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  • Graphite felt watch surface modified method and modified mineral carbon felt
  • Graphite felt watch surface modified method and modified mineral carbon felt
  • Graphite felt watch surface modified method and modified mineral carbon felt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] With graphite felt I as the cathode, NaOH and Na 2 CO 3 And the mixed solution of sodium lauryl sulfate is electrolyte, and electrolyte composition is sodium hydroxide 20g / l, sodium carbonate 20g / l, emulsifier 2g / l, and electrolyte temperature is 80 ℃; Electrochemical cathodic treatment with a current density of 75mA / cm 2 ; After 4 minutes, take it out for later use; use hot distilled water (70-80° C.) and distilled water to repeatedly clean the lye on the surface of the graphite felt. The graphite felt after electrochemical cathodic modification is used as the anode, 1M sulfuric acid solution is used as the electrolyte, the water bath is heated to 85°C, and the graphite felt is subjected to anodic oxidation modification by direct current, and the oxidation current density is 160mA / cm 2 , after the oxidation time of 4min, take it out for subsequent use; repeatedly clean the acid on the surface of the graphite felt with distilled water, and dry it to obtain the modifie...

Embodiment 2

[0041] With graphite felt II as the cathode, NaOH and Na 2 CO 3 The mixed solution is an electrolyte solution, each concentration is 20g / L, and the temperature of the electrolyte solution is 50°C; the graphite felt is subjected to electrochemical cathode treatment by direct current, and the current density is 140mA / cm 2 ; After 8 minutes, take it out for use; wash the surface of the graphite felt repeatedly with hot distilled water (70-80°C) and distilled water in turn until the distilled water after cleaning is neutral. The graphite felt after electrochemical cathode modification is used as the anode, 1M sulfuric acid solution is used as the electrolyte, the water bath is heated to 90°C±1°C, and the graphite felt is subjected to anodic oxidation modification by direct current, and the oxidation current density is 160mA / cm 2 , after the oxidation time of 4min, take it out for subsequent use; repeatedly clean the surface of the graphite felt with distilled water until the clea...

Embodiment 3

[0047] Graphite felt III is used as the cathode, NaOH solution is used as the electrolyte, the concentration is 40g / L, and the temperature of the electrolyte is 90°C; direct current is applied to the graphite felt for electrochemical cathode treatment, and the current density is 160mA / cm 2 ;Take it out after 10 minutes for later use; wash the graphite felt surface repeatedly with hot distilled water (70-80°C) and distilled water in turn until the distilled water after cleaning is neutral. The graphite felt after electrochemical cathodic modification is used as the anode, 1M sulfuric acid solution is used as the electrolyte, the water bath is heated to 85°C, and the graphite felt is subjected to anodic oxidation modification by direct current, and the oxidation current density is 160mA / cm 2 , after the oxidation time of 4min, it was taken out for subsequent use; the surface of the graphite felt was repeatedly cleaned with distilled water until the cleaned distilled water was neu...

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Abstract

The invention relates to a graphite fiber felt surface modification method and a modified graphite fiber felt, and belongs to the all vanadium redox flow battery electrode manufacture technical field. The method step is that the electrochemical cathode modification treatment is conducted before the anode oxidation treatment. When used as an electrode, a modified graphite fiber felt greatly improves the electrochemical activity in the preparation of an all vanadium redox flow battery, promotes the voltage efficiency and the battery energy efficiency during the battery discharging, and increases the stable discharging time, so the recharging and discharging performance of the all vanadium redox flow battery is greatly improved. Moreover, the method is easy for implantation and low in the cost. No particular devices are required. The invention provides a good-performance electrode material for the battery manufacture field.

Description

technical field [0001] The invention relates to a surface modification treatment method for graphite felt, and belongs to the technical field of electrode manufacturing for all-vanadium redox flow batteries Background technique [0002] It is currently recognized that graphite felt is the best electrode for all-vanadium redox flow batteries. Graphite felt is a carbon fiber with a high carbon content formed by carbonization and graphitization of organic fibers or pitch-based materials. Graphite felt has good stability in the electrolyte and a large real surface area, but has poor wettability and poor electrochemical activity, and must undergo surface modification before use. [0003] The surface modification methods of graphite felt used in the past include ① gas phase oxidation method, that is, heating and oxidation in air; ② liquid phase oxidation method, that is, soaking in strong oxidizing acid, such as heating sulfuric acid, nitric acid or a mixture of sulfuric acid and...

Claims

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Application Information

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IPC IPC(8): D06M10/00H01M4/04H01M4/88H01M4/86
CPCY02E60/12Y02E60/50
Inventor 罗冬梅常志峰冉洪波石瑞成黄可龙刘素琴董雅君
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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