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Expansion graphite base compound material dual-pole board and its making method

A technology of expanded graphite and composite materials, used in battery electrodes, final product manufacturing, sustainable manufacturing/processing, etc., can solve problems such as unsatisfactory interface bonding, affecting fuel cell performance, and easy layer-to-layer detachment, achieving excellent Corrosion resistance and oxidation resistance, overcoming the effects of poor mechanical properties and low production cost

Inactive Publication Date: 2008-01-09
WUHAN UNIV OF TECH
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  • Abstract
  • Description
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Problems solved by technology

[0005] The current method used to improve the strength of flexible graphite is usually: (1) adding effective additives, such as compounding phosphoric acid, boric acid, molybdic acid or salts of the three to improve its strength index, but the effect is not obvious; (2) ) combined with other materials to prepare carbon fiber or metal reinforced expanded graphite composite material, but the interfacial bonding between carbon fiber or metal and expanded graphite is not very ideal, and the layers are easy to fall off during use, which affects the performance of fuel cells

Method used

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  • Expansion graphite base compound material dual-pole board and its making method

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Effect test

Embodiment 1

[0019] Embodiment 1: adopt natural flake graphite to intercalate by chemical method (impregnated in H 2 SO 4 、HNO 3 In the mixed solution of H 2 SO 4 80% by volume, HNO 3 The volume percentage is 20%, stirred, and reacted for 30 minutes), filtered, washed with water to a pH value of 5-6, and dried to obtain expandable graphite. The expandable graphite is extruded at a high temperature of 1000°C to obtain worm-like graphite with an expansion factor of 240; add worm-like graphite to the mold, and press at 8MPa at room temperature to form a prefabricated expanded graphite plate with a thickness of 0.7mm.

[0020] The above two expanded graphite prefabricated plates and the carbon cloth (thickness 0.4mm, porosity 50%) put into the polyvinylidene fluoride / N, N-dimethylformamide solution with a solid content of 40wt% were impregnated, Dry at room temperature, then heat treat at 160°C for 2 hours.

[0021] The two impregnated expanded graphite prefabricated plates and carbon cl...

Embodiment 2

[0022] Embodiment 2: The preparation method is the same as that of Embodiment 1, except that the soaking liquid is replaced with polytetrafluoroethylene emulsion with a solid content of 50 wt%. The test results of its basic physical properties are shown in Table 1.

Embodiment 3

[0023] Embodiment 3: The preparation method is the same as in Embodiment 1, and the carbon cloth is replaced with carbon paper. The test results of its basic physical properties are shown in Table 1.

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Abstract

The invention is concerned with double plate of the proton exchange film fuel battery and it's making method. It is to have the two layers of the expansion graphite material and the mesosphere carbon cloth or carbon paper put in the double plate module with the gas flow field for molding; All of the molding materials dip inside the emulsion or solution of the thermoplastic resin with the solid content 10-50wt%; the expansion graphite material is the graphite in helminthes state.

Description

technical field [0001] The invention relates to a bipolar plate used in a proton exchange membrane fuel cell and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has the characteristics of high energy conversion efficiency, no pollution, rapid start-up at room temperature, long life and high power density. It has broad applications in fixed power stations, electric vehicles, military special power supplies, and mobile power supplies. It has application prospects, especially the driving power of electric vehicles, and is considered to be the third generation power system after the steam engine and internal combustion engine. It is precisely because PEMFC has so many advantages that the research on PEMFC has become a hot spot in the field of electrochemistry and energy science. In a single fuel cell, the membrane electrode (MEA) is used to generate electricity. The MEA is mainly composed of a Pt / C electrode that acts as an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M4/86H01M4/88H01M8/0282
CPCY02E60/50Y02P70/50
Inventor 沈春晖潘牧
Owner WUHAN UNIV OF TECH
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