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Nickel-based composite anode material of solid oxide fuel cell and application thereof

A technology of solid oxide and composite anode, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of ceramic skeleton and electrolyte cracks, poor nickel dispersion, and battery performance failure, so as to improve interface contact and improve resistance. Cycling redox performance, effect of reducing volume expansion rate

Inactive Publication Date: 2012-08-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Since the Ni-YSZ anode is sintered at high temperature (generally 1400°C) to ensure the compactness of the film, the higher nickel content (about 50wt.%) leads to poor dispersion of nickel in the anode material
[0005] 2. During the long-term operation of the battery, the cyclic conversion between Ni and NiO will produce a large volume expansion, resulting in cracks or even fractures in the ceramic skeleton and electrolyte, causing serious damage to the battery structure, and even leading to complete failure of battery performance

Method used

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  • Nickel-based composite anode material of solid oxide fuel cell and application thereof

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Experimental program
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Effect test

Embodiment 1

[0041] Using the method of nitrate co-decomposition, a total of 1.624g of magnesium nitrate (Mg(NO 3 ) 2 ·6H 2 O), 0.125g aluminum nitrate (Al(NO 3 ) 3 9H 2 O) and 17.450g nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O) mixture to obtain magnesium oxide and aluminum oxide modified nickel oxide-based anode material. Select magnesium oxide and alumina-modified nickel oxide as the anode catalyst material (wherein Ni: Mg: Al=0.9: 0.095: 0.005, molar ratio), mix (by weight) with 8YSZ (the molar content of yttrium oxide in YSZ is 8%) Ratio 60:40), add an organic adhesive (such as PVB and n-butanol (1:1 by weight) solvent, the amount is 30% of the total weight of the anode) to the powder, mix and grind thoroughly.

[0042] After drying, it is pressed at 100MPa, and then fired at 1350°C for 4 hours in an air atmosphere. The prepared strip-shaped composite anode material with a size of 1.5×4×20mm was used to investigate the volume expansion rate during the cyclic redox process. With hig...

Embodiment 2

[0045] Using the method of co-decomposition of nitrate, a total of 2.052g of magnesium nitrate (Mg(NO 3 ) 2 ·6H 2 O), 1.001g aluminum nitrate (Al(NO 3 ) 3 9H 2 O) and 16.285g nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O) mixture to obtain magnesium oxide and aluminum oxide modified nickel oxide-based anode material. The nickel oxide modified by magnesium oxide and aluminum oxide is used as the anode catalyst material (wherein Ni: Mg: Al=0.85: 0.11: 0.04, molar ratio), mixed with 8YSZ (the molar content of yttrium oxide in YSZ is 8%) (by weight Ratio 50:50), add an organic adhesive (such as PVB and n-butanol (1:1 by weight) solvent, the amount is 30% of the total weight of the anode) to the powder, mix and grind thoroughly.

[0046] After drying, it is pressed at 100MPa, and then fired at 1500°C for 3 hours in an air atmosphere. The strip-shaped composite anode material with a size of about 1.5×4×20mm was prepared to investigate the volume expansion rate during the cyclic redox...

Embodiment 3

[0049] A solid-state reaction method was used to directly mix magnesium oxide, aluminum oxide, nickel oxide and 8YSZ to prepare magnesium oxide and aluminum oxide-modified nickel oxide-based anode materials. Fully mix and grind all the oxides according to the corresponding proportion, then add an organic adhesive (such as PVB and n-butanol (1:1 by weight) solvent, the dosage is 30% of the total weight of the anode) to the powder and mix evenly.

[0050] After drying, press at 100MPa, and then bake at 1450°C for 3.5h in an air atmosphere. The strip-shaped composite anode material with a size of about 1.5×4×20mm was prepared to investigate the volume expansion rate during the cyclic redox process. When high-purity hydrogen is used as the reducing gas and air is used as the oxidizing gas, the oxidation and reduction processes are carried out at 700°C for 3 hours.

[0051] Composite anode substrates with a thickness of 800 μm were prepared by dry pressing and fired at 1450°C for ...

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Abstract

The invention relates to a nickel-based composite anode material of a solid oxide fuel cell and an application thereof. The composition of the composite anode material can be expressed by Ni1-x-yMgxAlyO1 plus 0.5y, wherein x varies from 0.01 to 0.2 and y ranges from 0.001 to 0.2. The composite anode material is compounded with an electrolyte material to prepare an anode, and the weight percentage of magnesium oxide and aluminium oxide modified nickel-based composite oxide material is 30-70 percent. During practical application, the composite anode is put into use after reduction, the reduced anode contains the electrolyte material, metal micron-nickel and nano particles, magnesium oxide, aluminium oxide and a composite oxide formed by magnesium oxide, aluminium oxide and nickel oxide. The novel composite anode can be used for flat-plate-type, tubular, honeycomb-type and oblate-tube-type solid oxide fuel cells.

Description

technical field [0001] The invention relates to a solid oxide fuel cell, in particular to a nickel-based solid oxide fuel cell composite anode material modified jointly by magnesium oxide and aluminum oxide. Modification and modification of the anode material by adding magnesium oxide and aluminum oxide to the traditional nickel-based anode material can prevent the sintering and growth of nickel particles and improve the surface morphology of the material. The obtained composite anode material has uniform distribution of material particles, It is not easy to sinter, high strength, small volume expansion rate, stable structure, etc., and more importantly, it improves the anti-cycle redox performance of nickel-based anode materials. The application of this composite anode material is of great significance for promoting the development of nickel-based anode solid oxide fuel cell technology to the application direction. Background technique [0002] Solid oxide fuel cell (SOFC)...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/86
CPCY02E60/50
Inventor 程谟杰张云涂宝峰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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