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Composite porous electrode, single cell and cell stack containing same and preparation method thereof

A technology of porous electrodes and monomers, which is applied in battery electrodes, regenerative fuel cells, fuel cell parts, etc., can solve the problem of difficult balance between the porosity and hardness of porous electrodes, and achieve the purpose of improving hardness and modulus, reducing Effect of contact resistance and low contact resistance

Active Publication Date: 2012-10-17
DONGFANG ELECTRIC (CHENGDU) HYDROGEN FUEL CELL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a composite porous electrode, a single cell and a battery stack containing the same and a preparation method thereof, which are used to solve the problem that the porosity and hardness of the porous electrode in the prior art are difficult to balance

Method used

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  • Composite porous electrode, single cell and cell stack containing same and preparation method thereof
  • Composite porous electrode, single cell and cell stack containing same and preparation method thereof
  • Composite porous electrode, single cell and cell stack containing same and preparation method thereof

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preparation example Construction

[0039] In another typical embodiment of the present invention, a method for preparing the composite porous electrode of the present invention is also provided. When the composite porous electrode includes an integrally formed porous electrode body 31 and a reinforcement part 33, the preparation method includes the following Steps: A1. Divide the area where the reinforced part 33 is to be formed in the porous electrode body 31 as the reinforced part matrix; and A2. Impregnate the resin material into the internal pores of the reinforced part matrix, and adhere the resin layer on the inner wall of the pore of the reinforced part matrix , form the reinforcing part 33, obtain the composite porous electrode 3; or when the composite porous electrode 3 includes the porous electrode body 31 and the reinforcing part 33 that are separately arranged, the preparation method includes the following steps: B1, dividing the porous electrode body 31 into multiple A region to be formed with the r...

Embodiment 1

[0059] Raw materials: Graphite felt is selected as the material of the porous electrode body, the porosity is 85%, and the external dimensions are 36mm*36mm*8mm. Polystyrene is selected as the impregnating resin, and the solvent is dimethylformamide.

[0060] making process

[0061] Preparation of reinforcement matrix: Divide two groups of cylindrical regions parallel to each other on the graphite felt. There are three cylindrical regions in each group of regions. Adjacent cylindrical regions between groups are arranged correspondingly. The total of all cylindrical regions The volume is 20% of the total volume of the composite porous electrode. The graphite felt in this area is cut out as the reinforcement matrix, and the remaining graphite felt with cylindrical through holes is used as the porous electrode body;

[0062] Preparation of reinforcement: Dissolve polystyrene resin in dimethylformamide to form a solution with a mass concentration of 18%, then immerse the matrix o...

Embodiment 2

[0066] Raw materials: Graphite felt is selected as the porous electrode body material, with a porosity of 85% and an overall size of 36mm*36mm*8mm. High-density polyethylene is selected as the impregnating resin.

[0067] making process

[0068] Preparation of reinforcement matrix: Divide two groups of regions parallel to each other on the graphite felt, each group of regions has three mutually isolated cylindrical regions, adjacent cylindrical regions between groups are arranged correspondingly, all cylindrical regions The total volume is 15% of the total volume of the composite porous electrode;

[0069] Prepare the reinforced part: Melt the high-density polyethylene into a melt at 180 °C; then place the melt on the upper end of the reinforced part matrix, immerse the melt into the reinforced part matrix, and wait until the melt is uniformly impregnated to the reinforced part In the matrix of the part, slowly cool to 25 °C to precipitate and solidify the polyethylene resin...

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Abstract

The invention discloses a composite porous electrode, a single cell and cell stack containing the same and a preparation method thereof. The composite porous electrode comprises a porous electrode body and an intensified part distributed in the porous electrode body, wherein the bending resistance of the intensified part is superior to that of the porous electrode body, and the intensified part is penetrated through the porous electrode body along the thickness direction of the porous electrode body. After assembling the porous electrode body and the intensified part having better bending resistance than the porous electrode body to form the composite porous electrode, the composite porous electrode has conductivity and a porous structure, and simultaneously, the rigidity and modulus thereof are also increased. In case of the combination with a collection plate or pole plate, a favorable interfacial combination with the collection plate or pole plate can be achieved by controlling the composite porous electrode to produce a small compression amount, so that the contact resistance in between can be reduced, thereby not affecting the penetration and diffusion of the electrolyte in the composite porous electrode and the smooth implementation of the redox reaction, and ensuring lower contact resistance between the composite porous electrode and the collection plate or pole plate.

Description

technical field [0001] The invention relates to the field of liquid flow batteries, in particular to a composite porous electrode, a single cell and a cell stack containing the same, and a preparation method thereof. Background technique [0002] All-vanadium redox flow batteries use vanadium ions V 2+ / V 3+ and V 4+ / V 5+ As the positive and negative electrode redox pairs of the battery, the positive and negative electrolytes are stored in two liquid storage tanks respectively, and the acid-resistant liquid pump drives the active electrolyte to the reaction site (battery stack) and then returns to the liquid storage tank to form Circulate the liquid flow loop to realize the charging and discharging process. In the all-vanadium redox flow battery energy storage system, the performance of the battery stack determines the charge and discharge performance of the entire system, especially the charge and discharge power and efficiency. The battery stack is formed by stacking...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M8/02H01M8/18
CPCY02E60/528Y02E60/50
Inventor 汤浩李婷刘红丽谢光有房红琳高艳
Owner DONGFANG ELECTRIC (CHENGDU) HYDROGEN FUEL CELL TECH CO LTD
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