Composite porous electrode, single cell comprising composite porous electrode, cell stack and preparation method of composite porous electrode

A technology of porous electrodes and monomers, applied in battery electrodes, regenerative fuel cells, fuel cell groups, etc., can solve the problem of difficult balance between porosity and hardness of porous electrodes, so as to improve hardness and modulus and reduce contact resistance , The effect of low contact resistance

Active Publication Date: 2012-10-17
DONGFANG ELECTRIC (CHENGDU) HYDROGEN FUEL CELL TECH CO LTD
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  • 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 comprising composite porous electrode, cell stack and preparation method of composite porous electrode
  • Composite porous electrode, single cell comprising composite porous electrode, cell stack and preparation method of composite porous electrode
  • Composite porous electrode, single cell comprising composite porous electrode, cell stack and preparation method of composite porous electrode

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preparation example Construction

[0032] In a specific embodiment of the present invention, when the resin material is a thermoplastic resin composition, the preparation method includes the following steps: A1, dissolving the resin material in a solvent to form a resin with a mass concentration of the resin material of 0.5-20% Material solution; A2, immerse the porous electrode 3' in the resin material solution, so that the resin material solution is impregnated into the pores of the porous electrode body 3'; and A3, volatilize the solvent in the porous electrode body 3', and make the resin material adhere A resin layer was formed on the inner walls of the pores of the porous electrode body 3 ′ to obtain a composite porous electrode 3 .

[0033] Dissolving the resin material in its good solvent to form a resin material solution, and then immersing the porous electrode body 3' in the resin material solution, under the action of liquid pressure, the resin material is impregnated into the pores, and is heated or p...

Embodiment 1

[0044] Raw materials: Graphite felt is used as the porous electrode body with a porosity of 85% and an overall size of 36mm*36mm*8mm. Polystyrene is selected as the impregnating resin, and the solvent is dimethylformamide.

[0045] Preparation process: first dissolve polystyrene resin in dimethylformamide to form a solution with a mass concentration of 1%; then immerse graphite felt into the solution, and wait until the solution is evenly impregnated into the graphite felt, and slowly heat to 155 ℃, kept for 6 hours to gradually volatilize dimethylformamide; then slowly cooled to 25 ℃ to precipitate and solidify polystyrene, that is, a composite porous electrode in which graphite felt was impregnated with polystyrene resin as a whole, and the total weight of the resin layer was obtained 0.8% of the total weight of the composite porous electrode.

[0046] The single cell of Example 1 was obtained by assembling the current collecting plate, the liquid flow frame, the diaphragm ...

Embodiment 2

[0048] Raw materials: Graphite felt is used as the porous electrode body with a porosity of 85% and an overall size of 36mm*36mm*8mm. High-density polyethylene is selected as the impregnating resin, and the solvent is xylene.

[0049] Preparation process: first dissolve polyethylene resin in xylene to form a solution with a mass concentration of 8wt%; then immerse graphite felt into the solution, and wait until the solution is evenly impregnated into graphite felt, slowly heat to 50°C and keep for 6h The solvent is gradually completely volatilized; then slowly cooled to 25 ° C to precipitate and solidify the polyethylene resin, that is, a composite porous electrode with high-density polyethylene resin impregnated with graphite felt as a whole, and the total weight of the resin layer is 5% of the total weight of the obtained composite porous electrode. %.

[0050] The single cell of Example 2 was obtained by assembling the current collecting plate, the liquid flow frame, the d...

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Abstract

The invention discloses a composite porous electrode, a single cell comprising the composite porous electrode, a cell stack and a preparation method of the composite porous electrode. The composite porous electrode comprises a porous electrode body and resin layers formed on the inner walls of pores of the porous electrode body; and through holes which can be used for ensuring electrolyte to flow are arranged in at least part of pores of the porous electrode body. After the resin layers are formed on the inner walls of the pores of the porous electrode body, when the composite porous electrode has electrical conductivity and porous structure, the resin layers take a skeleton supporting effect on the composite porous electrode, the hardness and the modulus of the porous electrode are improved, the composite porous electrode can be controlled to have well interface bonding with a collector plate or a pole plate under the condition of generating a small compression amount when being combined with the collector plate or the pole plate, and a contact resistance between the composite porous electrode and the collector plate or the pole plate is reduced, so that the effects of not only not influencing the process of smoothly carrying out penetration diffusion and oxidation-reduction reaction of electrolyte in the composite porous electrode, but also ensuring the low contact resistance between the composite porous electrode and the collector plate or the pole plate are achieved.

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): H01M4/86H01M4/88H01M8/18H01M8/24
CPCY02E60/528Y02E60/50Y02P70/50
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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