Composite bipolar plate for fuel cell and preparation method and application thereof

A bipolar plate and polymer technology, applied in fuel cells, applications, circuits, etc., can solve the problems of bipolar plate cost reduction, complex preparation process, low production efficiency, etc., and achieve crack resistance and stress deformation, and simple equipment requirements , Good product quality effect

Active Publication Date: 2019-04-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the bipolar plate prepared by this process requires a curing time of up to 1 day, and the production efficiency is low, which is not conducive to the reduction of the cost of the bipolar plate
Daniel Adams et al. (Energy Fuels 2017, 31, 14320-14331) adopted the method of adding a carbon felt intermediate transition layer to prepare a composite bipolar plate with a "sandwich" structure, which has high bending strength and conductivity, but the preparation process is relatively complicated and the preparation cost is high

Method used

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  • Composite bipolar plate for fuel cell and preparation method and application thereof
  • Composite bipolar plate for fuel cell and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] a) take by weighing 0.6kg polystyrene resin (particle diameter is 400 orders, molecular weight 52W), 5.0kg flake graphite (particle diameter is 600 orders), 0.2kg SEBS triblock copolymer (melt index is 5g / min), 0.15kg of carbon fiber is ball milled, the ball milling speed is 20r / min, and the ball milling time is 18min;

[0030] b) Transfer the above mixed material to the mold, the pre-compression pressure is 40MPa, the molding temperature is 220°C, the molding pressure is 80MPa, and the molding time is 20min;

[0031] c) Cooling with circulating water, reducing the temperature of the mold in step b) to room temperature, releasing the pressure, and demoulding to obtain the bipolar plate.

[0032] Such as figure 1 and figure 2 As shown, the measured conductivity of the obtained bipolar plate is 180S / cm, the bending strength is 51.8MPa, and the contact resistance is 6.8mΩ.cm 2 , the gas permeability is 1.24×10 -6 cm 3 / (cm 2 .s), the corrosion current is 1.13×10 -6...

Embodiment 2

[0034] a) take by weighing 0.8kg polystyrene resin (particle diameter is 600 orders, molecular weight 52W), 4.8kg flake graphite (particle diameter is 1000 orders), 0.25kg SEBS triblock copolymer (melt index is 12g / min), 0.25kg carbon fiber is ball milled, the ball milling speed is 30r / min, and the ball milling time is 27min;

[0035] b) Transfer the above mixed material to the mold, the pre-compression pressure is 50MPa, the molding temperature is 240°C, the molding pressure is 100MPa, and the molding time is 30min;

[0036] c) Using air cooling, the temperature of the mold in step b) is lowered to room temperature, the pressure is released, and the mold is demoulded to obtain the bipolar plate.

[0037] Such as figure 1 and figure 2As mentioned above, the measured conductivity of the obtained bipolar plate is 165S / cm, the bending strength is 58.6MPa, and the contact resistance is 8.3mΩ.cm 2 , the gas permeability is 0.88×10 -6 cm 3 / (cm 2 .s), the corrosion current is...

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Abstract

The invention relates to the field of the fuel cell, and discloses a preparation method of a carbon/polymer composite bipolar plate. The bipolar plate is composed of polystyrene resin, hydrogenated ethylene-butylene-styrene triblock copolymer, conductive filler and fiber reinforced material. The composite bipolar plate is low in air permeability, good in machining, and excellent in conductivity and corrosion resistance. The composite plate provided by the invention can be applied to a proton exchange membrane fuel cell, alkaline anion-exchange membrane fuel cell and methanol fuel cell.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a composite bipolar plate used for fuel cells and its preparation method and application. technical background [0002] A fuel cell is an energy conversion device that directly converts chemical energy into electrical energy. It has many advantages such as high energy conversion efficiency, high energy density, and environmental friendliness. The bipolar plate is a key component of the fuel cell and was widely used at first. The bipolar plate is a non-porous graphite plate, which has good electrical conductivity and corrosion resistance, but has the disadvantages of low strength and high porosity. In actual use, the thickness of 3-5mm must be guaranteed to ensure its mechanical strength. , which is not conducive to the improvement of the mass specific power of the stack. In addition, the machining cost of graphitization process and flow field is high, which is not conducive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0221H01M8/0226B29B13/10B29C43/58B29L31/34
CPCB29B13/10B29C43/58B29C2043/5808B29C2043/5816B29L2031/3468H01M8/0221H01M8/0226Y02E60/50
Inventor 邵志刚吕波何良苟勇王朋豪
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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