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Electrolyte matrix for molten carbonate fuel cells with improved pore size and method of manufacturing same

A fuel cell and electrolyte technology, applied in the electrolyte matrix, K2CO3 and Na2CO3, the material is Li2CO3, which can solve the problem of increasing humidity

Inactive Publication Date: 2009-05-27
FUELCELL ENERGY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, increased humidity leads to an undesired non-uniform matrix pore structure, which in turn has a negative impact on the strength of the matrix and the ability of the matrix to retain the electrolyte within its pores

Method used

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  • Electrolyte matrix for molten carbonate fuel cells with improved pore size and method of manufacturing same
  • Electrolyte matrix for molten carbonate fuel cells with improved pore size and method of manufacturing same
  • Electrolyte matrix for molten carbonate fuel cells with improved pore size and method of manufacturing same

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Embodiment 1

[0032] In this illustrative example, LiAlO is used 2 As the carrier material in the matrix, Li 2 CO 3 for the electrolyte material. use figure 2 The method shown in and described above is used to manufacture a matrix element filled with an electrolyte according to the invention. In the first step S101, the Li 2 CO 3 Premilled to an average particle size of less than 0.3 microns, and preferably 0.1-0.2 microns. As LiAlO 2 Typical surface area of ​​particles is 10m 2 / g, so pre-ground Li 2 CO 3 The desired surface area of ​​the particles is about 10m 2 / g. In this step, Li is added in the presence of a fish oil dispersant. 2 CO 3 pre-grind to prevent Li 2 CO 3 The particles are reagglomerated after the pre-grinding step. The amount of fish oil used in this step is equal to Li 2 CO 3 About 1-5% by weight. In this case, the Li 2 CO 3 Pre-milled to a particle size of 0.1-0.2 microns, the milling technique used a ball size of 2-6 mm Grinding media. The loadi...

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Abstract

A method of making a matrix element for carrying a carbonate electrolyte comprising providing a carbonate electrolyte material, pre-milling the carbonate electrolyte material to form a pre-milled carbonate electrolyte having a particle size of less than 0.3 microns, providing a support material, mixing the pre-milled carbonate electrolyte with the support material using a milling technique to form a mixture, and forming the mixture into the matrix element.

Description

Background of the Invention [0001] The present invention relates to fuel cells, and more particularly to electrolyte matrices for molten carbonate fuel cells. [0002] A fuel cell is a device that directly converts chemical energy stored in hydrocarbon fuels into electrical energy through an electrochemical reaction. Typically, fuel cells contain an anode and a cathode separated by an electrolyte that conducts charged ions. To generate efficient power levels, many individual fuel cells are stacked in series with conductive separators between the individual cells. [0003] Molten carbonate fuel cells ("MCFCs") work by passing reactant fuel gases through the anode while simultaneously passing the oxidizing gas through the cathode. The anode and cathode of the MCFC are isolated from each other by a porous electrolyte matrix impregnated with carbonate electrolyte. The matrix typically comprises porous unsintered γ-LiAlO impregnated with a molten alkali carbonate electrolyte 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/10C04B35/622
CPCH01M8/142H01M8/0295H01M8/145Y02E60/526Y02E60/50Y02P70/50H01M8/14H01M8/00
Inventor 徐耕夫喻肇宜
Owner FUELCELL ENERGY INC