Solid oxide fuel cell stack and preparation method thereof

A fuel cell stack and solid oxide technology, applied in fuel cells, circuits, electrical components, etc., can solve problems such as large interface stress, long manufacturing cycle, complex interface reaction, etc., achieve small thermal stress and improve long-term stability Effect

Active Publication Date: 2021-10-08
SICHUAN ENERGY INTERNET RES INST TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing battery stack preparation process mainly has the following disadvantages: due to the difference in thermal expansion coefficient between the ceramic battery-metal connecting plate-glass sealing material, large interface stress and complex interface reactions are caused, which seriously affects the life of the battery stack , which also brings some restrictions on the reduction of its manufacturing cost, which has become a bottleneck restricting the industrialization of SOFC technology
In addition, the existing battery stack preparation process also has the disadvantages of complex process and long manufacturing cycle

Method used

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  • Solid oxide fuel cell stack and preparation method thereof
  • Solid oxide fuel cell stack and preparation method thereof
  • Solid oxide fuel cell stack and preparation method thereof

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preparation example Construction

[0018] The inventors optimized the preparation process of the battery stack to form a battery stack structure with a special structure without using metal connecting plates.

[0019] An embodiment of the present invention provides a method for preparing a solid oxide fuel cell stack. The inventor creatively uses a plurality of porous ceramic skeletons with loading holes, and stacks them layer by layer by forming electrolyte membrane layers and ceramic connector membrane layers; The anode material is loaded in a porous ceramic skeleton, and the cathode material is loaded in another adjacent porous ceramic skeleton to form a battery stack in which the anode layer and the cathode layer are stacked alternately.

[0020] Below in conjunction with accompanying drawing, the specific operation steps of preparation method are introduced:

[0021] S1. Preparation of porous ceramic framework

[0022] Please refer to figure 1 , the electrolyte material and the pore forming agent are use...

Embodiment 1

[0057] This embodiment provides a method for preparing a solid oxide fuel cell stack, please combine Figure 1-3 , including the following steps:

[0058] (1) 8mol% Y 2 o 3 Stable ZrO 2 (8YSZ) is used as the electrolyte material and pore-forming agent graphite (90:10), the thickness of the skeleton is formed by extrusion molding method, the thickness of the skeleton is 100 μm, the ratio of the air channel height to the thickness of the skeleton is 1:3, and it is pre-fired at 1000 ° C for 3 hours Finally, the porous ceramic skeleton 100 is formed.

[0059] (2) Using 8YSZ as the electrolyte material, La 0.6 Sr 0.4 Cr 0.5 mn 0.5 o 3 (LSCrM) is used as the connector material, and the electrolyte membrane layer 300 and the ceramic connector membrane layer 200 are coated by the screen printing method, and the coating thickness of the electrolyte membrane layer 300 is controlled so that it is 10 μm after sintering, and the ceramic connector membrane layer 200 is controlled. ...

Embodiment 2

[0064] This embodiment provides a method for preparing a solid oxide fuel cell stack, which is roughly the same as that of Embodiment 1, and only the differences are described:

[0065] The electrolyte material uses 20mol% Gd 2 o 3 Stable CeO 2 (GDC), the connector material is GDC+La 0.6 Sr 0.4 Cr 0.5 mn 0.5 o 3 (LSCrM) as the connector material, the cathode material is La 0.8 Sr 0.2 co 0.2 Fe 0.8 o 3 (LSCF), the anode material is Ni. The sintering temperature in step (2) is 1450°C.

[0066] After testing: the battery stack adopts H 2 As fuel, air as oxidant, the peak power density at 650°C reaches 0.35W / cm 2 .

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Abstract

The invention discloses a solid oxide fuel cell stack and a preparation method thereof, and relates to the technical field of fuel cells. An electrolyte membrane layer and a ceramic connector membrane layer are formed by coating a porous ceramic framework, then back-to-back hot-pressing stacking is performed, and alternate impregnation is performed to obtain a negative electrode and a positive electrode, so that each repetitive unit of the cell stack comprises a negative electrode layer, an electrolyte membrane layer and a positive electrode layer which are sequentially arranged; and the anode layer in each repeating unit is connected with the cathode layer in the adjacent repeating unit through the ceramic connector film layer to form a cell stack structure in which the anode layers and the cathode layers are alternately stacked. The structure has abundant three-phase interfaces, the electrochemical performance of the cell is outstanding, the electrolyte and the connector are both compact ceramic films, the ohmic impedance is small, and the power output of the cell stack is high; and the ceramic connector with the thermal expansion coefficient consistent with that of the porous ceramic framework is adopted, the thermal stress is small, the thermal cycle performance of the cell stack is good, the oxidation corrosion problem does not exist, and the long-term stability of the cell stack can be improved.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a solid oxide fuel cell stack and a preparation method thereof. Background technique [0002] Solid Oxide Fuel Cell (SOFC) is a current development hotspot because of its high efficiency, wide fuel adaptability, and potential CO 2 Concentrated features. Since the operating voltage of each battery is only about 0.8V, it is necessary to connect single cells in series to form a battery stack. The traditional battery stack is to manufacture single cells first, then process the connection plates, and finally use sealing materials to combine them into a battery stack. [0003] The existing battery stack preparation process mainly has the following disadvantages: due to the difference in thermal expansion coefficient between the ceramic battery-metal connecting plate-glass sealing material, large interface stress and complex interface reactions are caused, which seriously affects t...

Claims

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Application Information

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IPC IPC(8): H01M8/1213H01M8/1226H01M8/241H01M8/2404
CPCH01M8/241H01M8/1213H01M8/1226H01M8/2404H01M2008/1293Y02P70/50
Inventor 王绍荣耿玉翠李航李汶颖
Owner SICHUAN ENERGY INTERNET RES INST TSINGHUA UNIV
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