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Processing method for reducing permeability of graphite cake of fuel battery

A treatment method and fuel cell technology, applied to fuel cell components, fuel cells, electrical components, etc., can solve the problems of reduced battery performance, slow dissolution, fuel cell performance degradation, etc., and achieve the effect of reducing air permeability

Inactive Publication Date: 2010-05-05
JIANGSU SHUANGDENG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will cause the air or oxygen on the oxidant side to pass through the graphite bipolar plate to reach the methanol and hydrogen side of the negative electrode during the use of the fuel cell, resulting in a micro-short circuit inside the battery and reducing the performance of the battery.
[0005] In order to effectively reduce the volume and weight of fuel cells, graphite plates are currently developing in the direction of low density and thin thickness. The thinner the graphite plate, the more serious the gas permeability problem; and the mechanical processing of the graphite bipolar plate , both sides of the plate should be engraved with a certain depth of flow field, so that the actual thickness of the flow field is thinner, and it is easier to generate cross-gas phenomenon
In addition, the best working temperature of the fuel cell is generally above 80°C. At a higher temperature, some organic substances and additives in the graphite plate will slowly dissolve under the erosion of water and methanol, which will also cause some new particles in the plate. Microporosity, leading to increased gas permeability of the graphite plate after a period of use and decreased performance of the fuel cell

Method used

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  • Processing method for reducing permeability of graphite cake of fuel battery
  • Processing method for reducing permeability of graphite cake of fuel battery
  • Processing method for reducing permeability of graphite cake of fuel battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take a graphite plate with a size of 150mm×150mm and a thickness of 2.0mm, wash the surface and dry it, use methanol as a solvent to prepare 1.5L of silane solution containing 55% trimethoxysilane, and then put the silane solution and graphite plate together in an airtight container , the silane solution completely submerged the graphite plate. Slowly raise the temperature to 85°C, pressure 0.1MPa, and keep warm for 24 hours.

[0018] Naturally cool to room temperature and take out the graphite plate, wash the surface of the graphite plate with deionized water, then immerse the graphite plate in 2mol / L hydrochloric acid, take it out after 2 hours, hang it for 9 hours, and finally put the graphite plate in a vacuum drying oven to heat To 60°C, remove a small amount of unreacted silane under a vacuum of -0.1MPa, and take it out after cooling down.

Embodiment 2

[0020] Take a 180mm×180mm, 1.5mm thick fuel cell graphite bipolar plate engraved with a 0.4mm deep flow field, wash the surface and dry it, and use methanol as a solvent to prepare a silane solution containing 60% of methyltrimethoxysilane 2.0L, then place the silane solution and the graphite plate together in a closed container, and the silane solution completely immerses the graphite plate. Slowly raise the temperature to 80°C, pressure 0.10MPa, and keep it warm for 30 hours.

[0021] Naturally cool to room temperature and take out the graphite plate, clean the surface of the graphite plate with absolute ethanol, then immerse the graphite plate in 2mol / L hydrochloric acid, take it out after 5 hours, hang it for 12 hours, and finally put the graphite plate in a vacuum drying oven Heat to 70°C, remove a small amount of unreacted silane under vacuum degree of -0.1MPa, and take it out after cooling down.

[0022] The air permeability of the graphite plate is characterized by th...

Embodiment 3

[0024] Take a piece of 120mm×120mm, 1.5mm thick graphite bipolar plate for direct methanol fuel cell that has been used for 200 hours, wash the surface and dry it, and use methanol:ethanol (volume ratio) as a 1:5 mixed solution to prepare the solvent containing Tetraethoxysilane 80% silane solution 2.0L, then put the silane solution and the graphite plate together in an airtight container, the silane solution completely submerged the graphite plate. Slowly raise the temperature to 105°C, pressure 0.2MPa, keep warm for 50 hours.

[0025] Naturally cool to room temperature and take out the graphite plate, clean the surface of the graphite plate with absolute ethanol, then immerse the graphite plate in 2.5mol / L hydrochloric acid, take it out after 15 hours, hang it for 12 hours, and finally put the graphite plate in a vacuum drying oven Heating to 100°C in a medium temperature, removing a small amount of unreacted silane under a vacuum degree of -0.05MPa, and taking it out after c...

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Abstract

This invention provides one battery to directly reduce carbinol fuel and photon exchange film fuel graphite transparent method, which comprises the following steps: first setting silage solution withformula as Mr.-Si-(OR')n; then dipping the graphite board into solution for 6 to 72 hours under termperature of 80 to150 degrees; taking out to clear surface by ion water or absolute ethyl alcohol dipped into rare alcaine for shining for 1 to 24 hours; fiannly putting into vacuum under 60 to 100 degrees to remove the unreacted silage.

Description

technical field [0001] The invention relates to a treatment process for graphite plates used in direct methanol fuel cells and proton exchange membrane fuel cells, in particular to a treatment method for reducing the gas permeability of graphite plates. Background technique [0002] As a new type of power generation technology, fuel cell has attracted more and more attention due to its green, environmental protection and high efficiency. Countries all over the world are investing in the research of fuel cell, among which direct methanol fuel cell and proton exchange membrane fuel cell are developing most rapidly. . Direct methanol fuel cells are mainly used in mobile and portable power sources such as notebook computers, digital cameras, and small vehicles such as electric bicycles; proton exchange membrane fuel cells are mainly used in electric vehicles, backup power supplies, and small power stations. Fuel cells have extremely broad application prospects. [0003] The el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M8/02H01M4/96H01M8/0213
CPCY02E60/50
Inventor 苏迎东闫智刚佘沛亮凌付冬王青
Owner JIANGSU SHUANGDENG GROUP