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Matrix for carbonate fuel cells and method of making same

A technology of fuel cells and carbonates, which is applied to fuel cell components, fuel cells, molten electrolyte fuel cells, etc., and can solve problems such as viscosity increase and gelation

Inactive Publication Date: 2007-01-24
ENERGY RES CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the hydrolyzate will eventually be transformed into α-LiAlO by drying 2 , but will eventually increase in viscosity or gel due to hydrogen bonding preventing the depolymerization process

Method used

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  • Matrix for carbonate fuel cells and method of making same
  • Matrix for carbonate fuel cells and method of making same
  • Matrix for carbonate fuel cells and method of making same

Examples

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[0044] BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 illustrates the steps in the process of preparing a ceramic substrate or tape in accordance with the principles of the present invention, using an aqueous solvent, and having a desired pore size distribution. Preferably, the ceramic material used is α-LiAlO 2 . When using the method of the present invention, stable α-LiAlO in water can be obtained 2 suspension. This suspension was subsequently used in the preparation of a water-based tape casting slurry with a higher ceramic solids content (60% by volume), but without gelling.

[0045] As shown in Figure 1, the method of the present invention is started by depolymerization process 11, and this process comprises: with α-LiAlO 2 The powder is dispersed in an aqueous solvent, to which a dispersant may be provided for this purpose. The ceramic powder dispersed in an aqueous solvent is then ground in a high energy mill.

[0046] High-energy milling makes α-LiAlO 2 Depolymeriza...

Embodiment

[0053] Composition examples of ceramic substrates formed by the method of the present invention are shown in figure 2 with image 3 middle. Illustrative examples of carrying out the method of the invention in order to obtain these substrates are described below:

[0054] The ceramic powder used in this example is α-LiAlO with a specific surface area of ​​11.3 m2 / g 2 (Cyprus Foote Mineral Company, Kings Mountain, NC). X-ray diffraction analysis showed only a negligible amount (0.4% by weight) of gamma-lithium aluminate in the final powder obtained, and citric acid (reagent grade, Aldrich, Milwaukee, WI) and distilled water ("DI") Prepare an aqueous solution for the depolymerization step with a ratio of citric acid to distilled water of 1 / 20-1 / 15. After adding LiAlO 2 The aqueous solution was stirred for 0.5 hours before ceramic powder.

[0055] Control the amount of ceramic powder to keep the ratio of citric acid to ceramic powder at 1 / 10-1 / 20. The deagglomeration proces...

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Abstract

A method of forming an electrolyte matrix for a carbonate fuel cell. An alpha -LiAlO2 ceramic is mixed in an aqueous solvent having a citric acid dispersant and deflocculated using a high energy attrition milling. The deflocculated mixture is added to an alcohol / glycerol aqueous binder system to form a slurry which is degassed and then tape cast to form the matrix.

Description

technical field [0001] The present invention relates to a carbonate fuel cell, and in particular to a substrate for use in such a cell and a method for its production. Background technique [0002] Carbonate fuel cells provide an efficient, environmentally friendly and clean energy source. In carbonate fuel cells, the key components are porous (40-50 volume percent porosity) and thin (0.5-1 mm) ceramic substrate. In carbonate fuel cells, the functions performed by the ceramic / electrolyte matrix include: (1) electrically isolating the cathode compartment from the anode compartment; (2) enabling ion conduction between the anode and the anode; and (3) enabling the cathode The gases in the chamber and the anode chamber are separated. [0003] The ceramic material of the matrix provides electrical isolation, while carbonates present in the pores of the ceramic matrix maintain ionic conduction. The pore size of the matrix is ​​required to be in the submicron range in order to ...

Claims

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Application Information

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IPC IPC(8): C04B35/44C04B35/63C04B35/632C04B35/634H01M8/02H01M8/14
CPCH01M2008/147H01M8/0295H01M2300/0051Y02E60/50C04B35/44Y02E60/526Y02P70/50
Inventor C·M·黄J·D·杜伊昂喻肇宜
Owner ENERGY RES CORP
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