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Low temperature solid oxide fuel cell and its preparation method

A solid oxide and fuel cell technology, applied in solid electrolyte fuel cells, battery electrodes, circuits, etc.

Active Publication Date: 2015-08-19
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] So far, this field has not developed a high power output in the low temperature range of 400-600 ° C, the oxidation-reduction cycle of the electrocatalyst and the cold-heat cycle performance of the battery are excellent, the battery preparation process is simple, the cost is low, and Low-temperature solid oxide fuel cells that do not require the introduction of barrier layers to suppress interfacial diffusion and chemical reactions between LSGM electrolytes and adjacent anodes and cathodes

Method used

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  • Low temperature solid oxide fuel cell and its preparation method
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  • Low temperature solid oxide fuel cell and its preparation method

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preparation example Construction

[0034] In the second aspect of the present invention, a kind of preparation method of novel low-temperature LSGM thin-film electrolyte fuel cell is provided, and this method comprises: at first adopting traditional ceramic forming process (such as casting, extruding, coating etc.) and high-temperature co-sintering technology Develop LSGM composite membranes, that is, porous LSGM|dense LSGM|porous LSGM; secondly, use chemical liquid phase immersion coating technology to deposit the cathode film and the anode film on the inner walls of the porous LSGM pores on both sides, thereby forming nanometer and micrometer double-scale Structured porous composite electrodes and single cells.

[0035] In the present invention, the preparation method of novel low temperature LSGM thin film electrolyte fuel cell specifically comprises the following steps:

[0036] (i) Mix LSGM powder with an organic solvent and add a dispersant, a binder, and a plasticizer to prepare a slurry; mix and ball mi...

Embodiment 1

[0050] Embodiment 1: the preparation of LSGM composite membrane

[0051] 1. Casting preparation of dense LSGM electrolyte membrane

[0052] The LSGM powder (La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 o 2.85 , 40 g), solvent (ethanol (EtOH) and methyl ethyl ketone (MEK), 50 g each), dispersant (triethanolamine (TEA), 2.5 g) were mixed and ball milled for 24 hours, and then the binder (polyvinyl alcohol Butyraldehyde (PVB), 2.5 grams), plasticizers (dibutyl phthalate (DOP) and polyethylene glycol (PEG), 0.9 grams each) continued ball milling for 24 hours. Vacuum defoaming for 15 minutes after the slurry is filtered, and then casting according to the required thickness (30-75 microns) to obtain a dense LSGM electrolyte membrane green body.

[0053] 2. Preparation of porous LSGM substrate film by tape casting

[0054] The LSGM powder (La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 o 2.85 , 40 grams), pore-forming agent (graphite, 20 grams), solvent (ethanol (EtOH) and butanone (MEK), each 75 grams), ...

Embodiment 2

[0057] Example 2: Preparation of flat nano-microstructure low-temperature SOFC

[0058] According to the LSGM composite membrane prepared in Example 1, the chemical liquid phase immersion deposition of the cathode film and the anode film was carried out.

[0059] 1. Chemical liquid phase immersion deposition of cathode film

[0060] a) Preparation of precursor solution

[0061] Selected Oxygen-Ion-Electron Mixed Conductor Sm 0.5 Sr 0.5 CoO 3 (SSC) as cathode thin film material. The starting material is Sm(NO 3 ) 3 , Sr(NO 3 ) 2 , Co(NO 3 ) 3 , Nitrate was dissolved in deionized water according to the stoichiometric ratio of SSC, and a homogeneous, stable and rheologically suitable precursor solution was obtained after stirring for 1 hour.

[0062] b) Chemical liquid phase immersion deposition of SSC in porous LSGM substrate

[0063] The precursor solution of SSC is introduced on the surface of the porous substrate. Driven by the wetting power, the solution flows ...

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Abstract

The invention relates to a low-temperature solid oxide fuel cell and a making method thereof. The structure of the low-temperature solid oxide fuel cell comprises an anode film deposited on the inner wall of a porous perovskite structure oxide ceramic La1-xSrxGa1-yMgyO3-delta composite film, a cathode film deposited on the inner wall of the porous perovskite structure oxide ceramic La1-xSrxGa1-yMgXO3-delta composite film, and a compact perovskite structure oxide ceramic La1-xSrxGa1-yMgyO3-delta electrolyte film positioned between the anode film and the cathode film, wherein each of x, y and delta is equal to or more than 0 and equal to or lower than 0.2, and the perovskite structure oxide ceramic La1-xSrxGa1-yMgyO3-delta composite film is formed through a porous perovskite structure oxide ceramic La1-xSrxGa1-yMgyO3-delta substrate, the perovskite structure oxide ceramic La1-xSrxGa1-yMgyO3-delta and a porous perovskite structure oxide ceramic La1-xSrxGa1-yMgyO3-delta film. The invention also provides the making method of the low-temperature solid oxide fuel cell.

Description

technical field [0001] The invention belongs to the field of solid electrochemistry and fuel cells, and relates to a novel low-temperature solid oxide fuel cell (SOFC), including tubular and flat SOFCs. The invention also relates to a preparation method of the novel low-temperature solid oxide fuel cell. Background technique [0002] Solid oxide fuel cells (SOFC) use hydrogen, natural gas, city gas, liquefied petroleum gas, biomass gasification gas, etc. as fuels to directly convert fuel chemical energy into electrical energy. Because SOFC has the characteristics of rich fuel, clean and efficient, and combined heat and power, it can be widely used in large-scale power plants, distributed power plants, and household combined heat and power. It is considered to be a transformative technology for future power plants. Ordinary SOFC uses yttria-stabilized zirconia (YSZ) as the electrolyte diaphragm, and its operating temperature is mostly higher than 700°C, while the new low-tem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88H01M8/10
CPCY02E60/521Y02E60/50Y02P70/50
Inventor 占忠亮钱继勤曾凡蓉叶晓峰吴天植吴昊韩达
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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