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Low-pressure and low-humidity gas diffusion layer for fuel cells, fuel cell and preparation method

A gas diffusion layer and fuel cell technology, which is applied in the direction of fuel cells, battery electrodes, electrical components, etc., can solve the problems of low strength, high volume resistance, and easy fracture of the gas diffusion layer, achieve excellent gas diffusion performance, and improve tensile strength. Strength, the effect of increasing mechanical strength

Active Publication Date: 2019-08-30
SHENZHEN GENERAL HYDROGEN ENERGY TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the inventors of the present application found in the long-term research and development process that the traditional gas diffusion layer has low strength, is easy to break, has high volume resistance, poor gas diffusion performance and drainage performance, and consumes a lot of energy when operating under high humidity and high pressure.

Method used

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  • Low-pressure and low-humidity gas diffusion layer for fuel cells, fuel cell and preparation method
  • Low-pressure and low-humidity gas diffusion layer for fuel cells, fuel cell and preparation method
  • Low-pressure and low-humidity gas diffusion layer for fuel cells, fuel cell and preparation method

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preparation example Construction

[0061] see in conjunction figure 1 and image 3 , image 3 It is a schematic flow chart of an embodiment of the method for preparing a gas diffusion layer for a low-pressure and low-humidity fuel cell in the present invention. The preparation method of this embodiment can prepare the above-mentioned gas diffusion layer. Let me tell you more. The method includes:

[0062] Step S101 : providing a carbon fiber substrate as a carbon fiber substrate sublayer 11 .

[0063] Step S102 : forming a compressive strength sublayer 12 and uniformly distributed conductive particles 13 on the surface of the carbon fiber substrate sublayer 11 to obtain a conductive porous substrate layer 1 .

[0064] Step S103: forming a hydrophobic low-humidity adaptation layer 2 on at least the surface of the conductive porous substrate layer 1, and in a low-humidity operating environment of 0-70%, the hydrophobic and low-humidity adaptation layer 2 can lock a part of water to keep the proton exchange me...

Embodiment 1

[0082] Example 1: Mix 1.3Kg of carbon powder, 1Kg of acrylic resin and 0.1Kg of methyl cellulose evenly and add them into 12Kg of hot water heated to 80-90°C, stir at a speed of 1300rpm for 1 hour, and then Disperse at a speed of 4000 rpm for 3 hours, and then stir in an ice-water bath at a speed of 300 rpm for 1 hour, thereby obtaining a homogeneously dispersed first mixture slurry. Adjust the coating head of the coating machine to evenly coat the first mixture slurry at 20g / m 2 On the carbon fiber paper, the coating thickness is 100-250μm. After the coating is completed, it is dried in a drying oven at 100°C for 5-10 minutes, sintering in a sintering furnace at 300°C for 2-10 minutes, and under the protection of a nitrogen atmosphere at 1400°C. Carry out carbonization in a carbonization furnace for 10-30 minutes to obtain a conductive porous substrate layer; the conductive porous substrate layer is conveyed by a rewinding and unwinding system through an impregnation tank fil...

Embodiment 2

[0085] Example 2: 1.7Kg of graphite powder, 1.5Kg of phenolic resin and 0.3Kg of hydroxyethyl cellulose were mixed evenly and then added to 15Kg of hot water heated to 80-90°C, stirred at a speed of 1300rpm for 1 hour, and then Disperse at a speed of 4000 rpm for 3 hours, and then stir in an ice-water bath at a speed of 300 rpm for 1 hour, thereby obtaining a uniformly dispersed first mixture slurry. Adjust the coating head of the coating machine to evenly coat the first mixture slurry at 20g / m 2 On the carbon fiber paper, the coating thickness is 100-250μm. After the coating is completed, it is dried in a drying oven at 100°C for 5-10 minutes, sintering in a sintering furnace at 300°C for 2-10 minutes, and under the protection of a nitrogen atmosphere at 1400°C. Carry out carbonization in a carbonization furnace for 10-30 minutes to obtain a conductive porous substrate layer; the conductive porous substrate layer is conveyed by a rewinding and unwinding system through an impr...

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Abstract

The invention discloses a low-pressure and low-humidity gas diffusion layer, a fuel cell and a preparation method. The gas diffusion layer comprises a conductive porous substrate layer, a hydrophobiclow-humidity adaptation layer and a micro-porous low-pressure adaptation layer. The conductive porous substrate layer includes a carbon fiber substrate sub-layer, a compressive sub-layer and uniformlydistributed conductive particles. The hydrophobic low-humidity adaptation layer is at least formed on the surface of the conductive porous substrate layer, and can lock a part of water to keep a proton exchange membrane wet in a low-humidity (0-70%) operation environment. The micro-porous low-pressure adaptation layer includes a porous material which is formed on one side of the hydrophobic low-humidity adaptation layer and uniformly distributed. The micro-porous low-pressure adaptation layer is hydrophobic, and the pores can ensure that the fuel permeates the gas diffusion layer and reachesthe proton exchange membrane to participate in the reaction in a low-pressure (0-75kPa) operation environment. Through the technical scheme, the mechanical strength of the gas diffusion layer can be improved, the gas diffusion layer has excellent gas diffusion performance and drainage performance, the fuel cell is enabled to operate stably in low-pressure and low-humidity environments, and technical support is provided for the adjustment of the bulk resistance.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a low-pressure, low-humidity fuel cell gas diffusion layer, a fuel cell, and a preparation method for the low-voltage, low-humidity fuel cell gas diffusion layer. Background technique [0002] A fuel cell is a device that converts chemical energy into electrical energy. Proton Exchange Membrane Fuel Cell (PEMFC, Proton Exchange Membrane Fuel Cell) is a kind of fuel cell. It is considered to be is the power supply first. [0003] The key components of a proton exchange membrane fuel cell include a proton exchange membrane, a catalytic layer, a gas diffusion layer, and bipolar plates (positive and negative plates). The gas diffusion layer is one of the key components affecting the performance of electrodes. An ideal gas diffusion layer should meet three conditions: good drainage, good air permeability and good electrical conductivity. At present, the performance of fuel cells...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0234H01M8/0239H01M8/0245H01M4/88
CPCH01M8/0234H01M8/0245H01M8/0239H01M4/8807Y02E60/50
Inventor 江靖尧克光李辉王海江
Owner SHENZHEN GENERAL HYDROGEN ENERGY TECH CORP LTD
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