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Novel metal bipolar plate surface modification method

A metal bipolar plate and surface modification technology, which is applied to the surface coating liquid device, special surface, pretreatment surface, etc., can solve the problem of reducing the service life of the metal bipolar plate, reducing the battery output power, and increasing the internal energy of the battery. To improve the corrosion resistance and interfacial bonding, increase the internal resistance of the battery, and reduce the internal resistance of the battery

Inactive Publication Date: 2021-01-15
惠州市海龙新材料科技有限公司
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Problems solved by technology

[0009] The purpose of the invention of the present invention is to solve the existing metal bipolar plate, which has severe corrosion in the environment of acidity, high temperature and high humidity, reduces the service life of the metal bipolar plate, forms oxides with poor conductivity, and increases the battery capacity at the same time. The problem of internal resistance that reduces the output power of the battery

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  • Novel metal bipolar plate surface modification method
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Embodiment 1

[0049] The stainless steel bipolar plate was first cleaned with isopropanol, then washed again with deionized water and dried for use. Using methanesulfonic acid (70%) and methyl ethylene glycol (30%) as a mixed electrolyte, at room temperature, the workpiece is 100mA / cm 2 The polishing treatment was carried out for 10 min (minutes) in the current density. The polished parts were washed with deionized water again to remove the residual electrolyte on the stainless steel sheet and dried in the air. Corrosion current I in simulated PEMFC corrosion environment corr ≤1μA / cm 2 , the cathode I after electropolishing corr down by more than 50%. The corrosion potential E of the polished sample relative to the untreated sample at the cathode corr There is a 0.05A ~ 0.08A increase. on the cathode I cor drop and E corr The increase of shows that electropolishing treatment can effectively improve the corrosion resistance of stainless steel.

[0050] Such as figure 2 As shown, t...

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Abstract

The invention discloses a novel metal bipolar plate surface modification method. The method comprises the following steps of step 1, carrying out electrolytic polishing treatment on a metal bipolar plate; step 2.1, fully grinding the mixture of titanium, aluminum and graphite together with sodium chloride or potassium chloride, pouring the mixture into an alumina crucible, carrying out heat preservation treatment in an argon protection environment under a high-temperature condition, cooling to room temperature, taking out the mixture, and grinding again to obtain MAX-phase Ti2AlC3; step 2.2, grinding the mixture of Ti2AlC3 and zinc chloride, putting the mixture into the aluminum oxide crucible, carrying out high-temperature heat preservation treatment in the argon protection environment, taking out the mixture, washing the mixture with deionized water to remove redundant zinc chloride, and finally, drying the mixture at 40 DEG C to obtain an MXene-phase Ti3ZnCl2 material; and step 3, spraying a prepared Ti3ZnCl2 MXene solution to the surface of the polished metal bipolar plate through an electronic spraying device under high pressure to obtain the surface-modified metal bipolar plate. A layer of MXene material is electrically sprayed on the metal surface, so that the corrosion resistance and the contact resistance of the metal surface are improved again, and the performance andthe service life of PEMFC are improved.

Description

technical field [0001] The invention relates to the technical field of battery manufacturing, in particular to a method for modifying the surface of a novel metal bipolar plate. Background technique [0002] Based on the depletion of fossil fuels and increasing concerns about environmental pollution, the demand for new energy is imminent. Among all alternative energy sources, proton exchange membrane fuel cell (PEMFC, its English proton exchange membrane fuel cell) is one of the best choices at present. Compared with other types of fuel cells, PEMFC has the advantages of realizability and long service life. It has the characteristics of low operating temperature (100°C), high energy density, high energy efficiency, fast start-up, no noise and low volatility. , so it is used in various industries, including the automotive industry, stationary power stations, portable equipment and other fields. [0003] The fuel cell stack is the core part of the fuel cell. Its core compone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/04B05D3/10B05D5/00B05D7/14B05D7/24C25F3/24H01M8/0206H01M8/0228
CPCB05D1/04B05D5/00B05D7/14B05D7/24B05D3/102H01M8/0206H01M8/0228C25F3/24Y02E60/50
Inventor 章池天颜美聪赵金华何明青宋阳阳
Owner 惠州市海龙新材料科技有限公司
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