Production method for flexible graphite polar plate with plough groove on both faces
A manufacturing method, flexible graphite technology, applied in the direction of final product manufacturing, sustainable manufacturing/processing, battery electrodes, etc., can solve the problems of bipolar plate leakage, increase plate thickness, impermeability, etc.
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[0021] Example 1
[0022] The 50-mesh expandable graphite with an expansion volume of 200ml / g is fully mixed with 10% by weight of acicular wollastonite powder. The particle size of the acicular wollastonite powder is 100 mesh. After being expanded in an expansion furnace at about 800°C, the expanded graphite powder passes Rolled to make a thickness of 4.5mm and a density of 0.2g / cm 3 , Expanded graphite board with a width of 450mm and a length of 500mm, cut this graphite board into a 450×120mm board, put such a graphite board in a closed impregnation tank, first vacuum the impregnation tank, the vacuum degree reaches -0.1MPa, and then Inhale the resin solution and immerse it in an ethanol solution mixed with phenolic resin and epoxy resin. The immersion time is about 10 minutes. The ratio of the resin solution is phenolic resin: epoxy resin: ethanol=10:5:85 (weight ratio). After being dipped, it will be volatilized frequently, and then dried at a temperature of about 90°C for abo...
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[0023] Example 2
[0024] In the same steps as in Example 1, the original plate thickness is 4.5mm expanded graphite plate, the overall thickness is 1.1mm, the depth of one side of the flow field is 0.5mm, the width is 1.0mm, and the other side is 0.2mm deep and 0.8mm wide. mm cathode plates for fuel cells.
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