Method of manufacturing solid oxide fuel cell including multi-layered electrolyte layer using calendering process

a solid oxide fuel cell and multi-layer electrolyte technology, which is applied in the manufacture of cell components, final product products, electrochemical generators, etc., can solve the problems of increasing the price of sofc system components, accelerating device deterioration, and single cell fabricated through the above process, so as to achieve the effect of improving densification

Active Publication Date: 2022-05-19
KOREA INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this patented technology relates to improving the density and quality of layers used for making high temperature ceramic materials by creating a more even distribution throughout them during production process. This results in better performance characteristics such as higher efficiency or longer lifespan under harsh conditions that may be experienced with traditional methods involving multiple steps like sintering and firing processes.

Problems solved by technology

This patented problem addressed in the patents relates to improving solid state redox flow batteries (SSRB). These systems use different types of metal ions called rare earth elements like lanthanoferrite (LaCu2θ2), tantalum dioxyde sulfuric acid copper salt (TaONb: LSMCO)-ceria composite (YSI023-zrocite)) instead of expensive metals like ruthenium (Ru); however, these complex compositions also limit their practicality due to reduced thermal conductance compared to pure nickel hydrogen peroxides (NiH2/Li, LiOH)/electrodes commonly employed in SSCRBs. To address this issue, certain techniques can be developed to achieve better compactness without compromising its effectiveness over time under various conditions during operation.

Method used

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  • Method of manufacturing solid oxide fuel cell including multi-layered electrolyte layer using calendering process
  • Method of manufacturing solid oxide fuel cell including multi-layered electrolyte layer using calendering process
  • Method of manufacturing solid oxide fuel cell including multi-layered electrolyte layer using calendering process

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

Support Layer

[0100]Nickel oxide (NiO), yttria-stabilized zirconia (YSZ) and polymethylmethacrylate (PMMA) were mixed at a volume ratio of 28:42:30 to obtain a powder. The powder and a solvent were mixed at a volume ratio of 24:76 to obtain a slurry. In this case, a mixed solvent containing ethanol and toluene was used as the solvent.

[0101]2.3 parts by weight of a polyester / polyamine condensation polymer (Hypermer KD-1, ICI chemical Co., Spain) as a dispersant, 9.3 parts by weight of poly(vinyl butyral) (PVB) as a binder, and 9.3 parts by weight of dibutyl phthalate as a plasticizer were added to 100 parts by weight of the slurry. The slurry was ball-milled for about 24 hours and then aged for about 24 hours.

[0102]The slurry was tape-cast to obtain an anode support layer sheet.

preparation example 2

Functional Layer

[0103]Nickel oxide (NiO) and yttria-stabilized zirconia (YSZ) were mixed at a volume ratio of 40:60 to obtain a powder. The powder and a solvent were mixed at a volume ratio of 24:76 to obtain a slurry. In this case, a mixed solvent containing ethanol and toluene was used as the solvent.

[0104]2.47 parts by weight of a polyester / polyamine condensation polymer (“Hypermer” KD-1) as a dispersant, 9.2 parts by weight of poly(vinyl butyral) (PVB) as a binder, and 8.49 parts by weight of dibutyl phthalate as a plasticizer were added to 100 parts by weight of the slurry. The slurry was ball-milled for about 24 hours and then aged for about 24 hours.

[0105]The slurry was tape-cast to obtain an anode functional layer sheet.

preparation example 3

Electrolyte Layer

[0106]An Fe-yttria-stabilized zirconia (Fe-YSZ) powder coated on the surface of 2 mol % of iron (Fe) based on 100 mol % of the total of the first electrolyte layer (Fe-YSZ electrolyte) and a solvent were mixed at a volume ratio of 7:93 to obtain a slurry. A mixed solvent containing ethanol and toluene was used as the solvent.

[0107]2.5 parts by weight of a polyester / polyamine condensation polymer (“Hypermer” KD-6) as a dispersant, 8.5 parts by weight of poly(vinyl butyral) (PVB) as a binder, and 10.5 parts by weight of dibutyl phthalate as a plasticizer were added to 100 parts by weight of the slurry. The slurry was ball-milled for about 24 hours and then aged for about 24 hours.

[0108]The slurry was tape-cast to obtain a first electrolyte layer sheet (Fe-YSZ electrolyte).

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Abstract

Disclosed is a method of manufacturing a solid oxide fuel cell including a multi-layered electrolyte layer using a calendering process. The method for manufacturing a solid oxide fuel cell is a continuous process, thus providing high productivity and maximizing facility investment and processing costs. In addition, the solid oxide fuel cell manufactured by the method includes an anode that is free of interfacial defects and has a uniform packing structure, thereby advantageously greatly improving the production yield and power density. In addition, the solid oxide fuel cell has excellent interfacial bonding strength between respective layers included therein, and includes a multi-layered electrolyte layer in which the secondary phase at the interface is suppressed and which has increased density, thereby advantageously providing excellent output characteristics and long-term stability even at an intermediate operating temperature.

Description

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Claims

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Application Information

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Owner KOREA INST OF SCI & TECH
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