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Cathode material for middle and low-temperature solid oxide fuel battery

A fuel cell cathode, solid oxide technology, used in solid electrolyte fuel cells, fuel cells, fuel cell components, etc., can solve problems such as low electrical conductivity, and achieve good cell performance, good compatibility, and stable electrical conductivity. The effect of rate cycling performance

Inactive Publication Date: 2008-09-17
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this material still has its own shortcomings, such as its electrical conductivity is still low compared with other cathode materials

Method used

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  • Cathode material for middle and low-temperature solid oxide fuel battery
  • Cathode material for middle and low-temperature solid oxide fuel battery
  • Cathode material for middle and low-temperature solid oxide fuel battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment one: 0.05mol (Ba 0.6 Sr 0.4 ) 0.9 La 0.1 co 0.85 Ti 0.15 o 3-δ Synthesis, conductivity test and chemical stability test.

[0016] Weigh 5.328g BaCO 3 (analytical pure), 2.657g SrCO 3 (analytical pure), 0.8145g La 2 o 3 (analytical pure), 0.599g TiO 2 (analytical pure) and 10.586g C 4 h 6 CoO 4 4H 2O (analytically pure). Grind the above materials in a ball mill jar for 5 hours to make them evenly mixed, using agate balls as grinding media, and alcohol as a dispersant. The homogeneously mixed slurry was dried, and the dried material was calcined at 1100° C. for 10 hours to obtain the desired cathode material (Ba 0.6 Sr 0.4 ) 0.9 La 0.1 co 0.85 Ti 0.15 o 3-δ . The prepared powder was determined to be a cubic perovskite structure by XRD powder diffraction method, such as figure 1 shown.

[0017] After pre-burning the dried material at 900°C for 5 hours, grind and sieve (100 mesh), add 20% (volume ratio) carbon powder, 2% (volume ratio) PV...

Embodiment 2

[0020] Embodiment two: 0.05mol (Ba 0.6 Sr 0.4 ) 0.95 La 0.05 co 0.85 Ti 0.15 o 3-δ Synthesized by solid phase reaction method.

[0021] Weigh 5.624g BaCO 3 (analytically pure), 2.805g SrCO 3 (analytical pure), 0.407g La 2 o 3 (analytical pure), 0.599g TiO 2 (analytical pure) and 10.586g C 4 h 6 CoO 4 4H 2 O (analytically pure). Pour the above materials into a ball mill jar, use agate balls as a grinding medium, and alcohol as a dispersant. After mixing and milling for 5 hours, the uniformly mixed slurry is dried. The dried material was calcined at 1100°C for 12 hours to obtain a cathode material with a cubic perovskite structure (Ba 0.6 Sr 0.4 ) 0.95 La 0.05 co 0.85 Ti 0.15 o 3-δ . Sieve the powder synthesized at 1100°C (160 mesh), add 10% by mass fraction of soluble starch and 1% by mass fraction of ethyl cellulose to 1g of cathode material, and finally add 1ml of deionized water, mix well and use The screen printing method is evenly coated on the surf...

Embodiment 3

[0022] Embodiment three: 0.05mol (Ba 0.6 Sr 0.4 ) 0.85 La 0.15 co 0.8 Ti 0.2 o 3-δ Synthesized by solid phase reaction method.

[0023] Weigh 5.032g BaCO 3 (analytical pure), 2.510g SrCO 3 (analytical pure), 1.222g La 2 o 3 (analytical pure), 0.599gTiO 2 (analytical pure) and 10.586g C 4 h 6 CoO 4 4H 2 O (analytically pure). Pour the above materials into a ball mill jar, use agate balls as a grinding medium, and alcohol as a dispersant. After mixing and milling for 5 hours, the uniformly mixed slurry is dried. The dried material was calcined at 1100°C for 10 hours to obtain a cathode material with a cubic perovskite structure (Ba 0.6 Sr 0.4 ) 0.85 La 0.15 co 0.85 Ti 0.15 o 3-δ .

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Abstract

The present invention provides a La doped low-to-intermediate temperature solid state oxide fuel cell, which molecular formula is (Ba0.6Sr0.4)1-xLaxCo0.85Ti0.15O3-theta, 0.052-based electrolyte, stably existing with CGO under 900 DEG C. The conductivity of the cathode material under the temperature 500 DEG C is 46.42S.cm-1, compared with the material having no La doping, the conductivity is enhanced about 150%. The cathode material is fit for low medium temperature solid oxide fuel cell.

Description

technical field [0001] The invention relates to a cathode material, in particular to a solid oxide fuel cell cathode material. Background technique [0002] Due to the high operating temperature of the traditional solid oxide fuel cell, it puts forward relatively strict requirements on the electrode material and connector material, and causes the problem of low battery life. At present, reducing the operating temperature of solid oxide fuel cells has become one of the research hotspots in the field of solid oxide fuel cells. The ohmic loss of the cathode accounts for a large proportion of the ohmic loss of the entire solid oxide fuel cell system, so the use of high-performance cathode materials is crucial to improving the energy conversion efficiency of the entire solid oxide fuel cell. Generally speaking, the basic requirements for the cathode material of medium and low temperature solid oxide fuel cells are: the material has high oxygen ion-electron conductivity in the me...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M8/02H01M8/10C04B35/46C01G23/00H01M8/1016
CPCY02E60/521Y02E60/50
Inventor 赵海雷滕德强程云飞李雪
Owner UNIV OF SCI & TECH BEIJING
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