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Positive electrode material of high-temperature fuel cell and preparation method of positive electrode material

A high-temperature fuel cell and cathode material technology, which is applied in solid electrolyte fuel cells, battery electrodes, circuits, etc., can solve the problems of poor cathode stability, cathode sintering, complex preparation process, etc., and achieve good contact, reduce complexity, and preparation methods simple effect

Active Publication Date: 2016-07-06
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

However, the preparation process of this method is complicated, and it often requires repeated impregnation and sintering to achieve the target single loading capacity of the cathode.
In addition, the cathode prepared by the impregnation method is usually nanoscale, and the cathode has serious sintering problems during long-term operation of the battery, and the cathode stability is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] With NiO-YSZ (mass ratio 1:1) as the anode, YSZ as the electrolyte, La 0.6 Sr 0.4 CoO 3-δ -2wt.%Bi 1.9 Fe 0.1 o 3-β for the cathode. Among them, La 0.6 Sr 0.4 CoO 3-δ powder (0.49g) with Bi 1.9 Fe 0.1 o 3-βThe powder (0.01g) was mixed and put into a beaker, absolute ethanol was added, the beaker was treated in an ultrasonic cleaner for 30min, and then the mixed powder was dried. Add an appropriate amount of binder (n-butanol, 0.5g) to the dried powder to prepare a cathode slurry, coat the cathode slurry (0.012g) on ​​the surface of the YSZ electrolyte, and bake at 800°C for 2h.

[0024] On the anode side, humidified hydrogen is used as fuel (volume concentration 3% H 2 O, 100mlmin -1 ), on the cathode side, oxygen as an oxidant (100mlmin -1 ). At 700°C, the current density of the battery at 0.8V is 0.5A.cm -2 .

Embodiment 2

[0026] With NiO-YSZ (mass ratio 1:1) as the anode, YSZ as the electrolyte, Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ -0.5wt.%Bi 1.95 Fe 0.05 o 3-β The composite material is the cathode. Among them, Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ Powder (0.995g) and Bi 1.95 Fe 0.05 o 3-β The powder (0.005g) was mixed and put into a beaker, absolute ethanol was added, the beaker was treated in an ultrasonic cleaner for 2h, and then the mixed powder was dried. Add an appropriate amount of binder (n-butanol, 1g) to the dried powder to prepare a cathode slurry, coat the cathode slurry (0.012g) on ​​the surface of the YSZ electrolyte, and bake at 800°C for 2h. Composite cathode area is 0.5cm 2 .

[0027] On the anode side, humidified hydrogen is used as fuel (volume concentration 3% H 2 O, 100mlmin -1 ), on the cathode side, oxygen as an oxidant (100mlmin -1 ). At 700°C, the current density of the battery at 0.8V is 0.7A.cm -2 .

Embodiment 3

[0029] With NiO-YSZ (mass ratio 1:1) as the anode, YSZ as the electrolyte, La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-δ -5wt.%Bi 1.9 Fe 0.1 o 3-β for the cathode. Among them, La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3-δ Powder (0.475g) and Bi 1.9 Fe 0.1 o 3-β The powder (0.025g) was mixed and put into a beaker, absolute ethanol was added, the beaker was treated in an ultrasonic cleaner for 30min, and then the mixed powder was dried. Add an appropriate amount of binder (n-butanol, 0.5g) to the dried powder to prepare a cathode slurry, coat the cathode slurry (0.012g) on ​​the surface of the YSZ electrolyte, and bake at 800°C for 2h.

[0030] On the anode side, humidified hydrogen is used as fuel (volume concentration 3% H 2 O, 100mlmin -1 ), on the cathode side, oxygen as an oxidant (100mlmin -1 ). At 700°C, the current density of the battery at 0.8V is 0.45A.cm -2 .

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Abstract

The invention discloses a positive electrode material of a high-temperature fuel cell and a preparation method of the positive electrode material. The positive electrode material disclosed by the invention is a composite positive electrode composed of a perovskite type composite oxide and an appropriate amount of Bi<2-x>M<x>O<3-Delta> oxide, wherein the M is equal to Mn, Fe, Co, Ni or Zn. The composite positive electrode can be directly sintered on the surface of a YSZ electrolyte with a stable yttrium oxide in a low temperature, cannot react with the electrolyte to form a low-conductivity impurity phase, and is high in battery performance. The positive electrode material disclosed by the invention is low in sintering temperature in the electrolyte, a cerium-oxide-based isolation layer is not needed to be prepared on the electrolyte surface, the complexity of the battery preparation process is reduced, and the battery preparation cost is reduced.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a cathode material of a solid oxide fuel cell and a preparation method thereof. Background technique [0002] Solid Oxide Fuel Cell (SOFC for short) can convert the chemical energy of fuel and oxidant into electrical energy through electrochemical reaction at high temperature. It has the characteristics of flexible fuel, high power generation efficiency, and environmental friendliness. It is an advanced energy conversion technology. [0003] Perovskite composite oxide is a commonly used cathode material for solid oxide fuel cells, which has ABO 3 Structure, the A site is a rare earth or alkaline earth element, and the B site is a transition metal element. For example, strontium-doped lanthanum cobaltate La 1-x Sr x CoO 3 , strontium doped samarium cobaltate Sm 1-x Sr x CoO 3 , strontium doped cobalt lanthanum ferrite La 1-x Sr x co 1-y Fe y o 3 , strontium barium ferrite Ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/10H01M4/86
CPCY02E60/50
Inventor 赵哲程谟杰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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