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Functional layer for high-temperature fuel cells and method for production

A high-temperature fuel cell, functional layer technology, applied in fuel cells, solid electrolyte fuel cells, final product manufacturing, etc., can solve problems such as inability to guarantee protection of cathodes, incompatibility of battery layers, inability to achieve resistance, etc., to improve electrocatalysis Active, active cathode surface increase, avoid the effect of resistance increase

Active Publication Date: 2010-09-22
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

K 2 NiF 4 The structure has a lower coefficient of thermal expansion, which leads to incompatibility with other battery layers
[0015] In addition, mechanical influences such as vibrations, pressure changes and strains cannot always be compensated by the contact layer, or a sufficiently high resistance to such influences cannot be achieved, and the conductive connection is again undesirably damaged
[0016] A contact layer formed from such a paste does not guarantee protection of the cathode from chromium vapors coming from the connection plate through the air flowing through the cathode area, which is also disadvantageous

Method used

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  • Functional layer for high-temperature fuel cells and method for production
  • Functional layer for high-temperature fuel cells and method for production
  • Functional layer for high-temperature fuel cells and method for production

Examples

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Embodiment Construction

[0043] Examples of electrically conductive functional layers for the manufacture of high-temperature fuel cells between the cathode and the connecting plate are described below.

[0044] La 0.79 Sr 0.2 mn 0.5 co 0.5 o 3-x and Bi 2 o 3 was used as starting material. In this regard, 50g has the composition La 0.79 Sr 0.2 mn 0.5 co 0.5 o 3-x (with an average particle size between 1.5 μm and 3.5 μm) perovskite in ethanol solution with 5.55 g Bi 2 o 3 Mix, then homogenize on a roller table or planetary ball mill. The homogenized powder mixture was dried and sieved. To the sieved powder mixture is added a solvent containing terpineol to which ethyl cellulose has previously been added as a binder, and the powder mixture is then processed on a three-roll mill to form a highly viscous, free-flowing of paste.

[0045] The paste is applied to the web by thick film techniques such as screen printing or mask printing or roll coating. However, it is advantageous to complete...

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Abstract

The invention relates to a functional layer for high-temperature fuel cells and to a method for the production of functional layers. The functional layer is in particular a low sintering, electrically conductive ceramic layer, which is configured between an interconnector and a cathode of a fuel cell. The functional layer according to the invention is made of a material having at least two phases. A first phase is a bismuth cobalt-containing perovskite ceramic and a second phase is a bismuth manganite and / or bismuth cobaltite (Bi-Mn-Co-O).

Description

technical field [0001] The invention relates to a functional layer of a high-temperature fuel cell and to a method for producing the functional layer. The functional layer is in particular a low-temperature sintered electrically conductive ceramic layer formed between the connection plate and the cathode of the fuel cell. Background technique [0002] High temperature fuel cells are developed to operate at temperatures between 650°C and 1000°C. Depending on the development goals, different materials are used. Cathodes made of ceramic materials in SOFC fuel cells are known. Connection plates made of metal are also known. [0003] A functional layer is to be understood as a layer which has to fulfill defined functions. In a fuel cell, the contact layer that assumes the function of conducting electricity between the cathode and the connecting plate is an example of such a functional layer. By means of the joining process, the functional layer ensures on the one hand the el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/12
CPCH01M8/0226C04B2235/768Y02E60/50C04B2235/80C04B2235/3268C04B2235/3213H01M8/0217C04B2235/3227C04B35/01C04B2235/3262C04B35/016C04B2235/5436Y02E60/525H01M2008/1293H01M8/2425C04B2235/3298C04B2235/3275Y02P70/50
Inventor 尼克莱·托菲门克桑迪·莫什维克塔尔·绍苏尔卡林·拉克米哈尔斯·库斯内佐夫
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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