Fuel cell bipolar plate and preparation method of titanium thin films on surfaces thereof

A fuel cell and bipolar plate technology, applied to battery electrodes, circuits, electrical components, etc., can solve problems such as accelerated corrosion, increased conductivity, and increased contact resistance of bipolar plates, achieving good corrosion resistance and excellent conductivity Effect

Pending Publication Date: 2017-09-22
苏州邦华真空镀膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing scheme of using stainless steel or titanium plate raw metal instead of scarce precious metals as bipolar plates has the advantage of low cost, but because of the existence of a passivation film, although it plays a positive role in improving the corrosion resistance, it greatly increases the bipolar plate. The contact resistance of the plates, so that the battery heats up during operation, power is reduced and corrosion is accelerated
In addition, there are also carbon-chromium nanocomposite films prepared from pure titanium targets and graphite targets by multi-arc ion plating technology and deposited on the surface of bipolar plates. This solution has certain cost advantages and has both electrical conductivity and corrosion resistance. The resistance of the carbon-chromium nanocomposite film on the surface of the bipolar plate is still as high as 15mΩ cm2 (0.8MPa pressure), and after 1000H of continuous simulated corrosion resistance test, the resistance increases exponentially compared with the initial resistance, and the conductivity increases with the decrease of corrosion resistance. Cause the battery to generate heat and power drop during operation

Method used

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  • Fuel cell bipolar plate and preparation method of titanium thin films on surfaces thereof
  • Fuel cell bipolar plate and preparation method of titanium thin films on surfaces thereof
  • Fuel cell bipolar plate and preparation method of titanium thin films on surfaces thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] After pre-cleaning and drying the stainless steel bipolar plate, fix it with a fixture and put it into the vacuum furnace of PVD equipment, and install a cylindrical pure titanium target and a cylindrical pure gold target on the cathode target; to 2×10 -2 At Pa, turn on the heating system to heat the vacuum chamber to 150°C and turn off the heating system; when evacuated to 4×10 -3 Pa, fill the argon gas pressure to 0.30pa, the argon gas flow rate is 50sccm, turn on the pulse bias voltage of -300×40KHZ×75%, start the cathode cylindrical pure titanium target arc, the arc current is 120A, and use the arc light evaporated by the target arc The discharge plasma and the glow discharge plasma of a small amount of inert gas bombard (sputter) the substrate to remove the surface passivation layer. After 10 minutes, the bias voltage is reduced to -100×40KHZ×75%, and the arc power supply of the cylindrical pure titanium target is turned off. Turn on the intermediate frequency pow...

Embodiment 2

[0063] After pre-cleaning and drying the stainless steel bipolar plate, fix it with a fixture and put it into the vacuum furnace of PVD equipment, and install a cylindrical pure titanium target and a cylindrical pure gold target on the cathode target; to 2×10 -2 At Pa, turn on the heating system to heat the vacuum chamber to 150°C and turn off the heating system; when evacuated to 4×10 -3 Pa, fill the argon gas pressure to 0.40pa, the argon gas flow rate is 300sccm, turn on the pulse bias voltage of -800×40KHZ×50%, start the cathode cylindrical pure titanium arc target, the arc current is 50A, and use the arc light evaporated by the target arc The discharge plasma and the glow discharge plasma of a small amount of inert gas bombard (sputter) the substrate to remove the surface passivation layer, and after 2 minutes, reduce the bias voltage to -150×40KHZ×75%, turn off the power of the column arc target and turn on the magnetron Cylindrical titanium target intermediate frequenc...

Embodiment 3

[0065] After pre-cleaning and drying the stainless steel bipolar plate, fix it with a fixture and put it into the vacuum furnace of PVD equipment, and install a cylindrical pure titanium target and a cylindrical pure gold target on the cathode target; to 2×10 -2 At Pa, turn on the heating system to heat the vacuum chamber to 150°C and turn off the heating system; when evacuated to 4×10 -3 Pa, fill the argon gas pressure to 0.50pa, argon gas flow rate is 500sccm, turn on the pulse bias voltage of -500×40KHZ×75%, start the cathode cylindrical pure titanium target arc, the arc current is 80A, and use the arc light evaporated by the target arc The discharge plasma and the glow discharge plasma of a small amount of inert gas bombard (sputter) the substrate to remove the surface passivation layer. After 5 minutes, the bias voltage is reduced to -50×40KHZ×75%, and the arc power supply of the cylindrical pure titanium target is turned off. Turn on the intermediate frequency power sup...

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Abstract

The invention discloses a fuel cell bipolar plate and a preparation method of titanium thin films on surfaces thereof, and belongs to the field of a fuel cell. The bipolar plate comprises a substrate and titanium nanometer composite thin film layers, wherein the titanium nanometer composite thin film layers are arranged at two side surfaces of the substrate and are deposited and formed on the surfaces of the substrate by employing an arc ion plating technology, and the bipolar plate plated with the titanium thin films is obtained by controlling a film coating parameter during the deposition process of the titanium thin films. By the bipolar plate, the corrosion resistance is improved by three orders of magnitude under a voltage of 0.6V in a fuel cell simulation environment and is improved by two orders of magnitude under 1.36V, the contact resistance is reduced to 0.5 milliohm.cm<2> or below (pressure of 0.2MPa), the bipolar plate has favorable corrosion resistance and excellent conductivity after test on corrosion resistance of the cell simulation environment for a long time, and the long-term running requirement of a regenerative fuel cell sectem and a proton exchange membrane cell are met.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a fuel cell bipolar plate and a method for preparing a titanium-gold film on its surface. Background technique [0002] The fuel cell (Fuel Cell) can directly convert the chemical energy stored in the fuel and oxidant into electrical energy. It has high conversion efficiency, environmental friendliness, and high reliability. It is considered to be the preferred efficient and sustainable power generation technology in the 21st century. [0003] Among all kinds of fuel cells, the renewable fuel cell (Regenerative Fuel Cell Sectem, referred to as RFC) is currently the energy storage system with the highest specific energy. It consists of two main parts: a water electrolysis (WE) pool and a fuel cell (FC). It can electrolyze water into hydrogen and oxygen through the electrolytic cell, and then generate electricity through the fuel cell to generate water from hydrogen and oxygen. It has the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86
CPCH01M4/8652H01M4/8657Y02E60/50
Inventor 施巧萍张凤梅
Owner 苏州邦华真空镀膜科技有限公司
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