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Preparation of a metal bipolar plate based on carbon film modification, the bipolar plate and application

A technology of metal bipolar plates and carbon films, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as poor stability of TiN coating, reduction of contact resistance between stainless steel and carbon paper, high price of gold, etc.

Inactive Publication Date: 2019-05-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, many researchers deposit TiN coating on the surface of base stainless steel, which significantly reduces the contact resistance between stainless steel and carbon paper, but the stability of TiN coating is poor.
Ho-Young Jung prepared a 1μm gold coating on the surface of the titanium plate, which prevented the formation of a passivation layer, and the battery performance was good, but the price of gold was too high to achieve large-scale commercial application.
B. Yang prepared Cr nitrides on the surface of stainless steel by thermal nitriding, but the film was discontinuous and the protection of the substrate was poor

Method used

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  • Preparation of a metal bipolar plate based on carbon film modification, the bipolar plate and application
  • Preparation of a metal bipolar plate based on carbon film modification, the bipolar plate and application
  • Preparation of a metal bipolar plate based on carbon film modification, the bipolar plate and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take a 0.1mm thick 316L stainless steel sheet, grind it step by step with 600 mesh to 2000 mesh sandpaper, clean it ultrasonically with acetone and water for 30 minutes, and vacuum to 1×10 -3 Pa~1×10 -2 Pa, fill with argon, adjust the pressure between 1Pa and 10Pa, deposit CrC / C composite coating on the surface of stainless steel sheet:

[0018] (1) Deposit the Cr bottom layer, increase the sputtering current of the chromium target from 0A to 5A, and sputter for 5 minutes;

[0019] (2) Deposit the CrC transition layer, the chromium target current drops to 2A, the graphite target current gradually rises to 6A, and the CrC coating is prepared;

[0020] (3) The currents of the chromium target and the graphite target were maintained at 2A and 6A respectively, and sputtered for 60 minutes to form a dense C:Cr coating;

[0021] (4) The current of the chromium target is gradually reduced to off, and the carbon film is formed by depositing at a sputtering current of 5A for 45...

Embodiment 2

[0024] Take a 0.2mm thick 316L stainless steel sheet, grind it step by step with 600 mesh to 2000 mesh sandpaper, clean it ultrasonically with acetone and water for 30 minutes, and vacuum to 1×10 -3 Pa~1×10 -2 Pa, adjust the pressure between 1Pa and 10Pa, deposit CrN / C composite coating on the surface of the stainless steel sheet:

[0025] (1) Introduce Ar gas into the cavity to deposit the bottom layer of Cr, increase the sputtering current of the chromium target from 0A to 5A, and sputter for 5 minutes;

[0026] (2) filled with Ar / N 2 (Ar gas, N 2 The flow ratio of the gas is 1:2), the CrN transition layer is deposited, the chromium target current drops to 2A, and the CrN coating is prepared;

[0027] (3) The current of the chromium target is gradually reduced to off, and the carbon film is formed by depositing at a sputtering current of 5A for 45min.

[0028] The as-prepared carbon film-based stainless steel bipolar plate was loaded at 140N cm -2 Under the compression ...

Embodiment 3

[0030] Take a 0.1mm thick titanium sheet, pickle it with 1% HF, ultrasonically clean it with acetone and water for 30min, and vacuum it to 1×10 -3 Pa~1×10 -2 Pa, adjust the pressure between 1Pa and 10Pa, deposit TiN / C composite coating on the surface of the titanium sheet:

[0031] (1) Introduce Ar gas into the chamber to deposit the bottom layer of Ti, increase the sputtering current of the titanium target from 0A to 5A, and sputter for 5 minutes;

[0032] (2) filled with Ar / N 2 (Ar gas, N 2 The gas flow ratio is 1:2), the TiN transition layer is deposited, the titanium target current is reduced to 2A, and the TiN coating is prepared;

[0033] (3) The titanium target current is gradually reduced to off, and the carbon film is formed by depositing at a sputtering current of 5A for 45min.

[0034] The as-prepared titanium alloy bipolar plate based on carbon film is at 140N cm -2 Under the pressing force, the contact resistance changed from the initial 516mΩcm 2 down to 5....

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Abstract

The invention relates to a surface modification method of a novel metal bipolar plate in the field of proton exchange membrane fuel cells. The modified bipolar plate is composed of a metal matrix anda surface modification layer, and the modification layer is deposited on the surface of the matrix through ion plating and is divided into a transition layer and an outermost layer. The corrosion resistance of the metal matrix can be further improved, the contact resistance of the bipolar plate and a gas diffusion layer material (carbon paper) is reduced, and the bipolar plate can be processed ina stamping manner and the like, so that the mass specific power and the volume specific power of the fuel cell stack are improved.

Description

technical field [0001] The invention relates to the preparation, bipolar plate and application of a metal bipolar plate based on carbon membrane modification in the technical field of proton exchange membrane fuel cells. Background technique [0002] A proton exchange membrane fuel cell (PEMFC) is an energy conversion device that converts chemical energy into electrical energy. It uses hydrogen and oxygen as raw materials, and reacts under the action of a catalyst to form water. Proton exchange membrane fuel cells are environmentally friendly, have high energy conversion efficiency, and can be started quickly, so they have received extensive attention from all over the world. In addition, it has broad application prospects in the fields of automobile industry, backup emergency power supply, distributed power station and military affairs. [0003] The bipolar plate is one of the key components of the proton exchange membrane fuel cell. It has the functions of connecting the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 曾亚超郑利民高正远艾军侯明邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI