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SOFC composite cathode material containing abnormal thermal expansion behavior material as well as preparation method and application of SOFC composite cathode material

A composite cathode, thermal expansion technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of TEC control that cannot be cathode, reduce cathode, etc., achieve low polarization resistance, good thermal matching, good long-term stability Effect

Pending Publication Date: 2022-01-07
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, from a theoretical analysis, these solutions can only reduce the TEC of the cathode to a certain extent, and are limited by the content of other materials doped or compounded, and cannot fundamentally control the TEC of the cathode in a range that is more compatible with the electrolyte.

Method used

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  • SOFC composite cathode material containing abnormal thermal expansion behavior material as well as preparation method and application of SOFC composite cathode material
  • SOFC composite cathode material containing abnormal thermal expansion behavior material as well as preparation method and application of SOFC composite cathode material
  • SOFC composite cathode material containing abnormal thermal expansion behavior material as well as preparation method and application of SOFC composite cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A SOFC composite cathode material containing a material with abnormal thermal expansion behavior, the component including PrBa 0.5 Sr 0.5 co 2 o 5+δ 、Sm 0.85 Zn 0.15 MnO 3 Complex.

[0032] PrBa 0.5 Sr 0.5 co 2 o 5+δ The mass percentage wt 1 80%, Sm 0.85 Zn 0.15 MnO 3 The mass percentage wt 2 20%. Recorded as 0.8PBSC-0.2SZM.

[0033] A method for preparing a SOFC composite cathode material containing a material with abnormal thermal expansion behavior, comprising the steps of:

[0034] a. Preparation of Sm 0.85 Zn 0.15 MnO 3 Powder: according to the stoichiometric ratio (ie Sm 3+ , Zn 2+ , Mn 3+ The molar ratio is 0.85:0.15:1) Weigh the corresponding Sm with a purity of more than 99.9wt%. 2 o 3 , ZnO with a purity of 99%wt or more, Mn with a purity of 99%wt or more 2 o 3 ; will Sm 2 o 3 , ZnO, Mn 2 o 3 Grind for 1 hour, then add absolute ethanol to grind for 1 hour, then dry to remove absolute ethanol, then use a powder tablet press to pres...

Embodiment 2

[0048] A SOFC composite cathode material containing a material with abnormal thermal expansion behavior, the component including PrBa 0.5 Sr 0.5 co 2 o 5+δ 、Sm 0.85 Zn 0.15 MnO 3 Complex.

[0049] PrBa 0.5 Sr 0.5 co 2 o 5+δ The mass percentage wt 1 90%, Sm 0.85 Zn 0.15 MnO 3 The mass percentage wt 2 10%. Recorded as 0.9PBSC-0.1SZM.

[0050] A method for preparing a SOFC composite cathode material containing a material with abnormal thermal expansion behavior, comprising the steps of:

[0051] a. Preparation of Sm 0.85 Zn 0.15 MnO 3 Powder: according to the stoichiometric ratio (ie Sm 3+ , Zn 2+ , Mn 3+ The molar ratio is 0.85:0.15:1) Weigh the corresponding Sm with a purity of more than 99.9wt%. 2 o 3 , ZnO with a purity of 99%wt or more, Mn with a purity of 99%wt or more 2 o 3 ; will Sm 2 o 3 , ZnO, Mn 2 o 3 Grind for 2 hours, then add absolute ethanol to grind for 2 hours, then dry to remove absolute ethanol, and then use a powder tablet machine...

Embodiment 3

[0060] A SOFC composite cathode material containing a material with abnormal thermal expansion behavior, the component including PrBa 0.5 Sr 0.5 co 2 o 5+δ 、Sm 0.85 Zn 0.15 MnO 3 Complex.

[0061] PrBa 0.5 Sr 0.5 co 2 o 5+δ The mass percentage wt 1 70%, Sm 0.85 Zn 0.15 MnO 3 The mass percentage wt 230%. Recorded as 0.7PBSC-0.3SZM.

[0062] A method for preparing a SOFC composite cathode material containing a material with abnormal thermal expansion behavior, comprising the steps of:

[0063] a. Preparation of Sm 0.85 Zn 0.15 MnO 3 Powder: according to the stoichiometric ratio (ie Sm 3+ , Zn 2+ , Mn 3+ The molar ratio is 0.85:0.15:1) Weigh the corresponding Sm with a purity of more than 99.9wt%. 2 o 3 , ZnO with a purity of 99%wt or more, Mn with a purity of 99%wt or more 2 o 3 ; will Sm 2 o 3 , ZnO, Mn 2 o 3 Grind for 1 hour, then add absolute ethanol to grind for 2 hours, then dry to remove absolute ethanol, then use a powder tablet press to pres...

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Abstract

The invention discloses an SOFC composite cathode material containing an abnormal thermal expansion behavior material as well as a preparation method of the SOFC composite cathode material. The SOFC composite cathode material containing the abnormal thermal expansion behavior material comprises the following components: PrBa0. 5Sr0. 5Co2O5 + delta and Sm0.85Zn0.15 MnO3, the mass percent wt1 of the PrBa0. 5Sr0. 5Co2O5 + delta is 70-90%, the mass percent wt2 of the Sm0.85Zn0.15 MnO3 is 10-30%, and the sum of wt1 and wt2 is 100%. An O-SOFC single cell composed of the PBSC-SZM, a conventional electrolyte material SDC and an anode material NiO-SDC has relatively low polarization resistance, and can output relatively high maximum power density; the thermal expansion coefficient of the PBSC-SZM cathode material is equivalent to the thermal expansion coefficient of SDC, so that the PBSC-SZM cathode material has good thermal matching property; the O-SOFC single cell composed of the PBSC-SZM, the conventional electrolyte material SDC and the anode material NiO-SDC has better long-term stability, the performance of the O-SOFC single cell can be kept not to be obviously reduced after long-term work, and meanwhile, the O-SOFC single cell further shows that the cathode and the electrolyte have good thermal matching performance.

Description

technical field [0001] The invention belongs to the technical field of SOFC cathode materials, and in particular relates to a SOFC composite cathode material containing a material with abnormal thermal expansion behavior, a preparation method and application thereof. Background technique [0002] Solid oxidation fuel cells (SOFC) have the advantages of high conversion efficiency, wide range of fuels, and environmental protection, and their commercial applications are gradually increasing. However, the operating temperature of traditional fuel cells is generally at a high temperature of 800-1000°C. Excessively high operating temperatures lead to manufacturing difficulties, high cost, constant operation, insufficient battery stability, and impossibility of fast start-up. Therefore, it is desirable to reduce the operating temperature of SOFC. However, when the operating temperature of the existing SOFC is lowered, the ohmic resistance of the electrolyte and the electrode polar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/90
CPCH01M4/8652H01M4/90H01M4/9025H01M4/9058Y02E60/50
Inventor 蔡彬刘康卢飞贾旭升李国军李根苏金瑞
Owner ZHENGZHOU UNIV
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