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A high temperature fuel cell cathode and its application

A high-temperature fuel cell and cathode technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as battery ohmic loss, reduce surface charge and surface stress, improve stability, and improve cathode stability.

Active Publication Date: 2020-08-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under the working conditions of the battery, the strontium element of the above-mentioned cathode material is easy to exist as SrO species at the battery cathode / electrolyte interface and the cathode / current collector interface, which hinders (La 0.6 Sr 0.4 ) 0.98 co 0.2 Fe 0.8 o 3-δ The upper charge transfer reaction causes battery ohmic loss (Electrochemical and Solid-State Letters, 2006, 9, A478-81)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) is the body layer, LSCF-GDC (Gd 0.1 Ce 0.9 O 1.95 ) Cathode of the modified layer and its preparation: Ni-YSZ (mass ratio 1:1) is used as the anode, YSZ is the electrolyte, and the GDC is the separator to prepare an anode-supported battery assembly. Preparation of La by the citric acid method 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ It is calcined at 1000° C. for 2 hours to obtain the bulk layer powder. The bulk layer powder (0.5 g) is fully ground and an appropriate amount of binder (n-butanol, 0.5 g) is added to prepare a slurry. Coat LSCF (0.012g) slurry on the separator of the anode-supported battery assembly, and fire it at 1050°C for 3h. Dissolve the nitrates of the corresponding components of LSCF-GDC in deionized water, add citric acid (the molar ratio of citric acid to metal ions is 1:1), heat at 90°C for 6 hours to obtain a sol solution, and immerse the sol into the LSCF cathode , Calcined at 800° C. for 2 hours to obtain a compos...

Embodiment 2

[0018] La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) is the body layer, LSCF-GDC (La 0.4 Ce 0.6 O 1.80 ) Cathode of the modified layer and its preparation: Ni-YSZ (mass ratio 1:1) is used as the anode, YSZ is the electrolyte, and the GDC is the separator to prepare an anode-supported battery assembly. Preparation of La by the citric acid method 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ It is calcined at 1000° C. for 2 hours to obtain the bulk layer powder. The bulk layer powder (0.5 g) is fully ground and an appropriate amount of binder (n-butanol, 0.5 g) is added to prepare a slurry. Coat LSCF (0.012g) slurry on the separator of the anode-supported battery assembly, and fire it at 1050°C for 3h. Dissolve the nitrates of the corresponding components of LSCF-GDC in deionized water, add citric acid (the molar ratio of citric acid to metal ions is 1:1), heat at 90°C for 6 hours to obtain a sol solution, and immerse the sol into the LSCF cathode , Calcined at 800° C. for 2 hours to obtain a compos...

Embodiment 3

[0021] Ba 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (BSCF) is the body layer, BSCF-LDC (La 0.4 Ce 0.6 O 1.80 ) Cathode preparation: Ni-YSZ (mass ratio 1:1) is used as the anode, YSZ is the electrolyte, and the GDC is the separator to prepare an anode-supported battery assembly. Preparation of Ba by the citric acid method 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ It is calcined at 1000° C. for 2 hours to obtain the bulk layer powder. The bulk layer powder (0.5 g) is fully ground and an appropriate amount of binder (n-butanol, 0.5 g) is added to prepare a slurry. Coat BSCF (0.012g) slurry on the separator of the anode-supported battery assembly, and fire it at 950°C for 3h. The nitrate of the corresponding component of BSCF-LDC is dissolved in deionized water, the solubility of LDC is 1M, the above-mentioned nitrate mixture is immersed in the bulk layer BSCF, and calcined at 700° C. for 2 hours to obtain a composite cathode. Among them, the mass content of the BSCF-LDC modified layer in the cathode is...

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PUM

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Abstract

The invention discloses a high-temperature fuel cell cathode and a preparation method thereof. The high-temperature fuel cell cathode is characterized in that a cathode material comprises a body layerand a modified layer, the body layer is perovskite oxide, the modified layer is a composite oxide comprising the perovskite oxide and a fluorite oxide, the mass ratio of the perovskite oxide to the fluorite oxide is 20%-80%, the particle size of the composite oxide of the modified layer is 0.5 to 300 nanometers, and the modified layer coats the surface of the body layer. The body layer can be preferentially prepared on the surface of an electrolyte or a separator of a battery by a coating method, a screen printing method, a tape casting method, and the like, and then the modified layer can beprepared onto the surface of the body layer by solution impregnation, sol-immersion, magnetron sputtering, or other method. The cathode material exhibits excellent electrochemical performances and good stability.

Description

Technical field [0001] The invention relates to the field of fuel cells, in particular to a solid oxide fuel cell cathode with good stability and performance and a preparation method thereof. Background technique [0002] The solid oxide fuel cell (Solid Oxide Fuel Cell, referred to as SOFC) directly converts the chemical energy of the fuel into electrical energy through an electrochemical reaction at a high temperature. It has the advantages of high power generation efficiency, wide fuel adaptability, and environmental friendliness. It is very useful Prospects for energy conversion technology. [0003] At present, in order to promote the practical application of solid oxide fuel cell technology and reduce the operating temperature, the development of medium and low temperature SOFC technology is an important direction in the field of solid oxide fuel cell research, and the development of high activity and high stability cathode materials is under development. The key problem that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86
CPCH01M4/86H01M4/8657Y02E60/50
Inventor 赵哲程谟杰尚磊黄志东
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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