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

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

A porous electrode and flow battery technology, which is applied in battery electrodes, regenerative fuel cells, fuel cell grouping, etc. Effect of resistance and low contact resistance

Active Publication Date: 2015-07-08
DONGFANG ELECTRIC (CHENGDU) HYDROGEN FUEL CELL TECH CO LTD
View PDF4 Cites 0 Cited by
  • 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

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
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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, immersing the porous electrode 3' in the resin material solution, so that the resin material solution is immersed in the pores of the porous electrode body 3'; and A3, volatilizing the solvent in the porous electrode body 3', so that the resin material adheres A resin layer is formed on the inner walls of the pores of the porous electrode body 3 ′ to obtain the composite porous electrode 3 .

[0033] The resin material is dissolved in its good solvent to form a resin material solution, and then the porous electrode body 3' is immersed in the resin material solution. The solvent used is volatilized, and after the solvent is volatilized, the resin material can form a...

Embodiment 1

[0044] Raw material: graphite felt is used as the porous electrode body, the porosity is 85%, and the external dimension is 36mm*36mm*8mm. Polystyrene is selected as the impregnating resin, and the solvent is dimethylformamide.

[0045] Preparation process: first dissolve the polystyrene resin in dimethylformamide to form a solution with a mass concentration of 1%; then immerse the graphite felt into the solution, and after the solution is evenly dipped into the graphite felt, slowly heat to 155 ℃, keep it for 6h to make the dimethylformamide gradually and completely volatilize; then slowly cool to 25℃ to precipitate and solidify the polystyrene, that is, a composite porous electrode with a polystyrene resin impregnated with graphite felt is obtained, and the total weight of the resin layer is 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 collector plate, the flow frame, the s...

Embodiment 2

[0048] Raw material: graphite felt is used as the porous electrode body, the porosity is 85%, and the external dimension is 36mm*36mm*8mm. High-density polyethylene is used 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 the graphite felt into the solution, and after the solution is evenly immersed into the graphite felt, slowly heat to 50°C for 6h The solvent is gradually and completely volatilized; and then slowly cooled to 25° C. to precipitate and solidify the polyethylene resin, that is, a composite porous electrode with an integrally impregnated graphite felt with a high-density polyethylene resin is obtained, 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 collector plate, the flow fra...

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 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 battery stack containing the same, and a preparation method thereof. Background technique [0002] The all-vanadium redox flow battery uses vanadium ions V 2+ / V 3+ and V 4+ / V 5+ As the positive and negative redox pairs of the battery, the positive and negative electrolytes are stored in two storage tanks respectively, and the active electrolyte is driven by an acid-resistant liquid pump to the reaction site (battery stack) and then returned to the storage tank to form Circulating liquid flow circuit 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-discharge performance of the entire system, especially the charge-discharge power and efficiency. The battery stack is formed by stacking multiple single ce...

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): 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