Composite graphite material for bipolar plate of fuel cell and preparation method of composite graphite material

Abstract

The invention provides a composite graphite material for a fuel cell bipolar plate and a preparation method of the composite graphite material, and belongs to the field of novel composite graphite materials. The invention relates to a composite graphite material for a bipolar plate of a fuel cell, which comprises composite resin and a conductive filler. The invention also provides a preparation method of the composite graphite material for the bipolar plate of the fuel cell, which comprises the following steps: (1) mixing a phenolic resin solution, an acrylic acid solution and an epoxy resin solution to obtain a composite resin solution; (2) putting graphite powder, graphene, carbon microspheres and carbon black powder into a positive pressure stirrer to obtain a conductive filler; (3) grading and mixing the composite resin solution and conductive filler, and curing to obtain a composite graphite material; and according to the invention, the contact uniformity and the fitting degree are ensured. The prepared composite graphite material is high in corrosion resistance, high in toughness, good in compactness and high in conductivity.

Description

technical field [0001] The invention belongs to the field of novel composite graphite materials, and in particular relates to a composite graphite material for fuel cell bipolar plates and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cells directly convert the chemical energy in hydrogen and oxygen into electrical energy without being limited by the Carnot cycle, so they have high energy conversion efficiency and are environmentally friendly, and can be widely used in transportation and ground power generation. However, the voltage of a single battery is low (0.6V ~ 1.0V). Therefore, in order to obtain a practical voltage, it is necessary to connect multiple single batteries in series. , oxygen, collecting current and supporting membrane electrodes, and also responsible for the heat dissipation and drainage functions of the entire battery system. Therefore, the bipolar plate material needs to be corrosion-resistant, conductive, go...

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Problems solved by technology

Both thermosetting resin and graphite have the advantages of good corrosion resistance. In the prior art, if the composite graphite bipolar plate wants to have high electrical conductivity and high thermal conductivity, the proportion of graphite material in the composite material needs to be increased. At the same time, the content of resin will be reduced, but if the proportion of resin is reduced, the toughness and airtightness of the material will not meet the requirements

[0006] Composite graphite bipolar plates in the prior art have poor toughness and low electrical conductivity, while meeting the requirements of high electrical conductivity and high toughness

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