Method for producing carbon felt electrode material for flow battery

Abstract

The invention discloses a method for producing a carbon felt electrode material for a flow battery and relates to the technical field of production of storage batteries. The method comprises the following steps: pre-treating a polyacrylonitrile (PAN) pre-oxidation felt which serves as a raw material in a carbonized furnace with temperature gradient; placing the carbonized PAN pre-oxidation felt in an activation area, filling O2 or CO2 for reaction, and performing in-situ growth on a COOH group on the surface of the PAN pre-oxidation felt. By the adoption of the method, a carbon felt electrode can be prepared and modified in one step, the type of oxygen-containing functional groups formed on the surface of a carbon felt is changed, and the in-situ growth of the oxygen-containing functional groups is realized. A PAN carbon felt electrode containing different types and numbers of oxygen-containing functional groups can be correspondingly applied to different types and scales of flow battery systems. By comprehensively evaluating the battery performance, an optimal matching relationship between the type and number of the oxygen-containing functional groups and the performance of the flow battery can be constructed, so that the carbon felt electrode material can be optimally applied to the flow battery.

Description

technical field [0001] The invention relates to the technical field of storage battery production. Background technique [0002] The redox flow battery has the advantages of good current conversion capability, flexible structure design, reasonable cost, and easy operation. It is a new type of green secondary battery suitable for large-scale energy storage. [0003] At present, commercial flow batteries generally use PAN carbon felt electrodes, but the inertness and hydrophobicity of carbon felts need to be improved. Therefore, the modification of carbon felts has become one of the important means to improve the performance of electrode materials. At present, the main methods for modifying PAN carbon felt at home and abroad include air oxidation, liquid phase oxidation, and electrochemical oxidation. These modification methods are mainly to add oxygen-containing functional groups on the surface of carbon felt, which can help to improve the electrochemical activity and hydrop...

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Problems solved by technology

[0004] However, the commonality of the above modification measures is that the finished carbon felt is used as the raw material, and the carbon fiber surface has been completely carbonized, so that the structure and performance of C in the carbon fiber have been stabilized, and the introduction of oxygen-containing functional groups based on stable C is bound to have limitations.