Preparation method of microporous layer in gas diffusion layer

A gas diffusion layer and microporous layer technology, which is applied in electrical components, battery electrodes, circuits, etc., can solve the problems that the single-layer microporous layer cannot meet the function of air conduction and drainage, water flooding, etc., to enhance water management capabilities and The effect of gas diffusivity, improving hydrophobicity, reducing porosity

Inactive Publication Date: 2020-04-10
WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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Problems solved by technology

[0002] In the fuel cell, the gas diffusion layer includes a substrate and a microporous layer. The substrate is made of carbon fiber paper. The preparation method of the microporous layer is to apply the slurry to one side of the substrate to form a microporous layer; the current fuel cells are all One side of the substrate is coated with paste to form a single microporous layer. The thermal battery with this kind of microporous layer has defects. When the fuel cell is working at a high current density, the single-layer microporous layer prepared by the traditional process is difficult to meet its conductivity. Air drainage function, more serious flooding problems

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  • Preparation method of microporous layer in gas diffusion layer

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[0014] The invention provides a method for preparing a microporous layer in a gas diffusion layer, such as figure 1 shown, including the following steps,

[0015] (1) Obtain at least two kinds of slurry;

[0016] (2) Select a slurry to be coated on one side of the substrate q;

[0017] (3) drying, hot rolling, and sintering the coated slurry in sequence to form a microporous layer;

[0018] (4) selecting another slurry and coating the other slurry on the side of the microporous layer away from the substrate q;

[0019] (5) Drying, hot rolling, and sintering are performed sequentially on the coated another slurry to form another microporous layer;

[0020] (6) Repeat the above steps (4) to (5) to prepare all the microporous layers after all the slurry is processed.

[0021] The slurry described in step (1) to step (6) is a mixture of hydrophobic material, conductive carbon black and solvent, hydrophobic material includes one or more than two in PTFE, PDDA, PVDF, FEP, ETFE, ...

Embodiment 1

[0032] A method for preparing a microporous layer in a gas diffusion layer, comprising the steps of:

[0033] Step (1), weigh 1.75g ​​conductive carbon black (U.S. Cabot XC-72R), 0.45g TritonX-100, 4.45g ethylene glycol (Shanghai Aladdin Company), 0.51g PTFE emulsion (Shanghai Hesen Electric Co., Ltd. Company), then weighed 13.35g deionized water into a beaker and carried out ultrasonic dispersion for 30min; the mixture obtained after the ultrasonic dispersion treatment was stirred for 60min at 8000rpm to obtain the microporous layer slurry A, and the stirring used was a high-speed disperser (Germany IKA company, T25 digital display type);

[0034] Weigh respectively 2.19g conductive carbon black (U.S. Cabot XC-72R), 0.55g Triton X-100, 4.45g ethylene glycol (Shanghai Aladdin Company), 0.91g PTFE emulsion (Shanghai Hesen Electric Co., Ltd.), and then Weigh 13.35g of deionized water into a beaker and carry out ultrasonic dispersion for 30min; the mixture obtained after the ult...

Embodiment 2

[0043] A method for preparing a microporous layer in a gas diffusion layer, comprising the steps of:

[0044]Step (1), respectively weigh 1.5g conductive carbon black (U.S. Cabot XC-72R), 0.40gTriton X-100, 3.8g ethylene glycol (Shanghai Aladdin Company), 0.4gPTFE emulsion (Shanghai Hesen Electric Co., Ltd.), then weighed 12.15g deionized water into the beaker and carried out ultrasonic dispersion for 30min; the mixture obtained after the ultrasonic dispersion treatment was stirred at 8000rpm for 60min to obtain the microporous layer slurry A, which was stirred using a high-speed disperser ( German IKA company, T25 digital display type);

[0045] Weigh respectively 2.19g conductive carbon black (U.S. Cabot XC-72R), 0.55g Triton X-100, 4.45g ethylene glycol (Shanghai Aladdin Company), 0.91g PTFE emulsion (Shanghai Hesen Electric Co., Ltd.), and then Weigh 13.35g of deionized water into a beaker and carry out ultrasonic dispersion for 30min; the mixture obtained after the ultra...

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Abstract

The invention relates to the technical field of preparation of microporous layers of fuel cells, and discloses a preparation method of a microporous layer in a gas diffusion layer, which comprises thefollowing steps: (1) obtaining at least two slurries; (2) selecting a slurry to coat one side of the substrate; (3) sequentially carrying out drying, hot pressing and sintering treatment on the coated slurry to form a microporous layer; (4) selecting another slurry and coating the other slurry on one side, far away from the substrate, of the microporous layer; (5) sequentially carrying out drying, hot pressing and sintering treatment on the other coated slurry to form another microporous layer; and (6) repeating the steps (4) to (5), preparing all microporous layers after the slurry is completely treated, and continuously reducing the porosity of the microporous layers along the direction far away from the substrate. The fuel cell provided by the invention cannot be flooded by water.

Description

technical field [0001] The invention relates to the technical field of fuel cell microporous layer preparation, in particular to a method for preparing a microporous layer in a gas diffusion layer. Background technique [0002] In the fuel cell, the gas diffusion layer includes a substrate and a microporous layer. The substrate is made of carbon fiber paper. The preparation method of the microporous layer is to apply the slurry to one side of the substrate to form a microporous layer; the current fuel cells are all One side of the substrate is coated with paste to form a single microporous layer. The thermal battery with this kind of microporous layer has defects. When the fuel cell is working at a high current density, the single-layer microporous layer prepared by the traditional process is difficult to meet its conductivity. The function of air drainage has become more serious. Contents of the invention [0003] The purpose of the present invention is to overcome the a...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/86
CPCH01M4/861H01M4/8807Y02E60/50
Inventor 肖飞虎夏丰杰程凤方晓曦李柯
Owner WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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