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Medium temperature solid oxide fuel cell composite cathode material and preparation method thereof

A solid oxide, composite cathode technology, applied in solid electrolyte fuel cells, battery electrodes, circuits, etc., can solve the problems of sintering temperature difference, high porosity of composite cathode, composite cathode and electrolyte, etc., achieve good sintering activity, solve the problem of cathode The effect of insufficient porosity and good compatibility

Active Publication Date: 2011-08-31
中科西卡思(苏州)科技发展有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the current cathode materials of high temperature solid oxide fuel cells are not suitable for working at medium temperature, the difference in the two-phase sintering temperature of the direct hybrid composite cathode makes it difficult to simultaneously ensure the high porosity of the composite cathode and the high relationship between the composite cathode and the electrolyte. In view of the problem of bonding strength, the object of the present invention is to provide a composite cathode material suitable for medium temperature (600-800°C) solid oxide fuel cells and its preparation method

Method used

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  • Medium temperature solid oxide fuel cell composite cathode material and preparation method thereof
  • Medium temperature solid oxide fuel cell composite cathode material and preparation method thereof
  • Medium temperature solid oxide fuel cell composite cathode material and preparation method thereof

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Embodiment 1

[0029] Example 1: Preparation of composite cathode ESB-LBSM for intermediate temperature solid oxide fuel cell by impregnation method

[0030] (1) The oxygen ion conductive material ESB (Bi 0.7 Er 0.3 o 1.5 ) powder: take 18.64g of Bi according to the stoichiometric ratio 2 o 3 and 6.5575 g of Er 2 o 3 , and then use zirconia balls as the ball milling medium and ethanol as the solvent to mix and ball mill for 3 hours with a planetary ball mill; the uniformly mixed Bi 2 o 3 and Er 2 o 3 The mixed powder was dried at 80 °C and then treated at 700 °C for 8 h to obtain cubic phase ESB (Bi 0.7 Er 0.3 o 1.5 ) powder, and then the obtained ESB powder was planetary ball milled for 3 hours according to the above method of mixing ball milling and dried at 80° C. to obtain dry ESB powder.

[0031](2) Preparation of ESB slurry: Mix 1g of ESB powder with 0.2g of soluble starch, add 30g of zirconia balls, mill on a planetary ball mill for 3 hours, take out and dry at 80°C, add 1...

Embodiment 2

[0039] Example 2: Preparation of intermediate temperature solid oxide fuel cell composite cathode LBSM-ESB by impregnation method

[0040] (1) Preparation of cathode material LBSM by citric acid-nitrate reaction method ((La 0.74 Bi 0.10 Sr 0.16 )MnO 3-δ ) powder: according to the stoichiometric ratio, four kinds of nitrates containing La, Bi, Sr, and Mn elements were weighed and dissolved in dilute nitric acid solution, stirred at 60°C for 2 hours to form a clear solution, and a certain amount of Citric acid (citric acid moles: metal ion moles=1.25:1) was stirred at 80°C for 4 hours to obtain a sol, and the sol was dried at 120°C for 24 hours to obtain a xerogel, and the xerogel was heat-treated at 850°C for 5 hours, After cooling, grind to obtain LBSM cathode material powder.

[0041] (2) Preparation of LBSM slurry: Mix 1 g of LBSM powder with 0.25 g of soluble starch, add 30 g of zirconia balls, mill it on a planetary ball mill for 3 hours, take it out and dry it at 80°C...

Embodiment 3

[0050] When A' is La, Ba or Y, preparation method is identical with embodiment 1 or 2. The mass percentage of LBSM cathode material in the whole composite cathode is 35-55%.

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Abstract

The present invention relates to a high performance medium temperature solid oxide fuel cell composite cathode and a preparation method thereof. The composite cathode consists of an ionic conduction phase (Bi(1-x)A'xO1.5) and cathode material ((La(0.84-y)BiySr0.16)MnO(3-sigma)). The preparation method comprises: ionic conduction phase powder is prepared by a solid phase synthesis method, and cathode material powder is prepared by a citric acid- nitrate method; then, sizing agent silk screen is printed onto zirconia (SSZ) electrolyte with stable scandium oxide; after being dried and processed, three dimensional porous oxygen ionic conduction phase framework (or cathode material framework); after that, cathode material (or ionic conduction phase material) precursor solution is dripped on the ionic conduction phase framework (or cathode material framework), and then dried and processed by heat; finally, the composite cathode having high electrochemistry property can be obtained after the operation is repeated for a plurality of times. The grain diameters of electrode material particles injected with the dipped ions are within the range of 50-200nm, and the electrode material injected with the ions accounts for the mass percentage of about 35-55% in the whole composite cathode.

Description

technical field [0001] The invention relates to a composite cathode material for a medium-temperature solid oxide fuel cell and a preparation method thereof, belonging to the technical field of solid oxide fuel cells. Background technique [0002] Solid oxide fuel cells have the highest energy utilization efficiency among all fuel cells, up to 90%, and power generation efficiency can be as high as 70%, so they have great competitiveness in power systems and transportation systems that consume a lot of energy. Has great potential. However, there are still some problems in traditional high-temperature (800°C-1000°C) solid oxide fuel cells, such as sintering of electrodes, interface chemical diffusion between electrolyte and electrodes, high cost of ceramic connecting plates and easy oxidation of metal connecting bodies, etc. Seriously hindered the process of commercialization of solid oxide fuel cells. The way to solve the problem is to reduce the operating temperature of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88H01M8/10
CPCY02E60/521Y02E60/50
Inventor 王绍荣李军良
Owner 中科西卡思(苏州)科技发展有限公司
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