Binder-free molten carbonate fuel cell electrolyte membrane and preparation method thereof

A technology of molten carbonate and electrolyte membrane, used in molten electrolyte fuel cells, fuel cells, electrolytes, etc., can solve the problems of carbon deposition, affecting the performance of MCFC, and poor performance.

Pending Publication Date: 2021-06-08
HUANENG POWER INT INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment has the following problems: before the electrolyte is melted, it will affect the gas distribution in the flow field, affect the combustion of organic matter in the diaphragm and the volatilization of combustion products; the electrolyte is likely to be entrained by the gas into the pipeline, blocking the pipeline
A relatively complete electrolyte membrane can be obtained by using organic solvents and binders, but the added polymer binder is difficult to completely decompose during the heating process of MCFC, and the undecomposed binder will produce carbon deposition in the single cell, affecting MCFC performance
Patent CN200710041712.8 uses water as solvent to make LiAlO 2 The integrated electrolyte membrane prepared by ball milling with carbonate electrolyte has very low loose strength due to the binderless structure, and the large assembly pressure during the assembly process will fracture the integrated membrane, which directly leads to gas blow-by and air leakage of the diaphragm, and the performance is very poor. Poor or even cathode and anode short circuit cause direct combustion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 53g Li 2 CO 3 47 grams K 2 CO 3 The powder (molar ratio 62%: 38%) is mixed as an electrolyte powder, and the electrolyte powder mass and the weight ratio of the diaphragm are 0.96.

[0034] The weighing 100 grams of electrolyte powder was mixed with 200 grams of unhaneous ethanol mixed ball milling for 12 h.

[0035] The ball milling electrolyte slurry was evacuated, and the temperature was 35 ° C.

[0036] The regulating the casting knife is adjusted to 1.5 mm, the control cast speed, and the electrolyte slurry is formed in a width of the separator.

[0037] The drying temperature was 35 ° C, and the time 15h was opened on the prepared electrolyte membrane in the molded electrolyte membrane, and the electrolyte membrane was as sized as the diaphragm.

Embodiment 2

[0039] 53g Li 2 CO 3 47 grams K 2 CO 3 The powder (molar ratio 62%: 38%) is mixed as a electrolyte powder, and the electrolyte powder mass and the weight ratio of the diaphragm are 1.16.

[0040] The weighing 100 grams of electrolyte powder was mixed with 160 g of n-butanol mixed ball milling for 24 h.

[0041] The ball milling electrolyte slurry was evacuated, and the temperature was 35 ° C.

[0042] Regulating the casting knife height to 2.5 mm, controlling the casting speed, and the electrolyte slurry is formulated according to the width of the diaphragm.

[0043] The drying temperature was 35 ° C, time 20 h, and the mold was opened on the prepared electrolyte membrane according to the molded mold as the separator, and cropped an electrolyte membrane as a size of the diaphragm.

Embodiment 3

[0045] 43g Li 2 CO 3 57 grams NA 2 CO 3The powder (molar ratio is 52%: 48%) is mixed as an electrolyte powder, and the electrolyte powder mass and the weight ratio of the diaphragm are 1.26.

[0046] The weighing 100 grams of electrolyte powder was worn with 180 ethanol mixed ball milling for 20 h.

[0047] The ball milling electrolyte slurry was evacuated, and the temperature was 35 ° C.

[0048] Regulating the raw squeegee height to 2 mm, controlling the casting speed, and the electrolyte slurry according to the width of the diaphragm is formed.

[0049] The drying temperature was 35 ° C, time 24 h, and the mold was opened on the prepared electrolyte membrane in the molded electrolyte membrane in the same size, and cropped the electrolyte membrane as the diaphragm size.

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Abstract

The invention discloses a binder-free molten carbonate fuel cell electrolyte membrane and a preparation method thereof, belonging to the technical field of fuel cells. The preparation method comprises the following steps: firstly, weighing a certain amount of Li2CO3 and K2CO powder, or Li2CO3 and Na2CO3 powder as electrolyte powder; mixing the weighed electrolyte powder with an organic solvent, and carrying out ball milling to obtain electrolyte slurry; carrying out vacuum pumping and tape casting on the electrolyte slurry; and finally, conducting drying and cutting to obtain the electrolyte membrane. According to the method, a binder is not added into the electrolyte membrane in cell stack assembling, and an electrolyte is directly filled with the membrane carrier after being molten, so the loss of the electrolyte under a high-temperature condition can be reduced, cell performance is improved, the service life of the cell is prolonged, and the method has good application prospects.

Description

Technical field [0001] The present invention belongs to the technical field of fuel cells, and a molten carbonate fuel cell electrolyte membrane and a preparation method thereof thereof in a non-bonded agent. Background technique [0002] Molten carbonate fuel cell (Molten Carbonate Fuel Cell, McFC) is a high-temperature fuel cell working on 650 ° C, has no precious metallic catalyst, wide range of fuel, low noise, and pollutants basically reach near zero emissions, power generation High efficiency, which can realize the advantages of thermal electrical power supply, suitable for 100,000 watt-to-range distributed power plants or fixed power stations, with good development prospects. [0003] The molten carbonate fuel cell operates at 650 ° C, and the structure of the MCFC can be divided into cathodes, electrolytes, and an anode three parts, wherein the electrolyte is a molten carbonate. The electrolyte of the MCFC is composed of a porous diaphragm carrier and a carbonate. The mol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/14
CPCH01M8/145H01M2008/147H01M2300/0051Y02E60/50
Inventor 程健张瑞云许世森李昊卢成壮白发琪
Owner HUANENG POWER INT INC
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