Unlock instant, AI-driven research and patent intelligence for your innovation.

Graphite felt surface modified method and modified graphite felt

A technology of surface modification and graphite felt, applied in the direction of surface reaction electrolytic coating, electrolytic coating, coating, etc., can solve the problem of improving the water wettability and electrochemical activity of graphite felt at the same time. Unsatisfactory chemical properties, 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: 2009-09-30
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
View PDF4 Cites 0 Cited by
  • 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 by method ④ has a good effect in the initial stage of use, but after a period of battery cycle, the coating of the electrode is easy to fall off, the electrode activity is greatly reduced and impurities are brought into the system
[0004] At present, there is no modification treatment method in the prior art that can simultaneously improve the water wettability and electrochemical activity of graphite felt

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Graphite felt surface modified method and modified graphite felt
  • Graphite felt surface modified method and modified graphite felt
  • Graphite felt surface modified method and modified graphite 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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for modifying the surface of a graphite felt and a modified graphite felt, and belongs to the technical field of electrode manufacturing for an all-vanadium redox flow battery. The steps of the method are: performing electrochemical cathode modification treatment before anodic oxidation modification treatment. The modified graphite felt as an electrode greatly improves the electrochemical activity in the preparation of the all-vanadium redox flow battery, improves the voltage efficiency of the battery discharge, the efficiency of the battery energy, and improves its stable discharge time, thus making the whole The charging and discharging performance of the vanadium redox flow battery is greatly improved; and the method is simple and easy to operate, does not require special equipment, and is low in cost. The invention provides an electrode material with good performance for the battery manufacturing 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 an...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/00D06M10/00H01M4/04H01M4/88H01M4/86
CPCY02E60/50
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