Method for producing carbon felt electrode material for flow battery

A technology of flow batteries and electrode materials, applied in battery electrodes, circuits, electrical components, etc.

Inactive Publication Date: 2013-12-11
GAOYOU INST CO LTD DALIAN UNIV OF TECH
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  • Summary
  • Abstract
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  • Application Information

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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.

Method used

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Embodiment Construction

[0015] 1. Preparation of carbon felt electrode materials for flow batteries:

[0016] 1. Carbonization:

[0017] The raw material is PAN pre-oxidized felt with a thickness of 5-8mm (the length and width of PAN pre-oxidized felt depends on the production conditions and usage requirements).

[0018] Put the PAN pre-oxidized felt into the carbonization furnace, and pass through the low-temperature carbonization zone at 300-700°C (heating rate: 10°C / min), and the medium-temperature carbonization zone at 700-900°C (heating rate: 5°C / min); 900 ~1200°C high-temperature carbonization zone (heating rate: 2°C / min).

[0019] After taking out, the temperature is naturally lowered to below 900°C.

[0020] 2. Activation:

[0021] After the carbonization is completed, the PAN pre-oxidized felt will continue to enter the activated oxidation zone with a temperature of 400-900 ° C. In this zone, O 2 Or CO with a diameter of 2-50nm 2 , and gradually increase the concentration of oxidizing g...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 谭毅张欢施伟李佳艳李强
Owner GAOYOU INST CO LTD DALIAN UNIV OF TECH
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