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Cathode material of mesotherm solid oxide fuel battery and preparation method thereof

A fuel cell cathode and solid oxide technology, which is applied to battery electrodes, cobalt oxide/cobalt hydroxide, circuits, etc., can solve the problems of expensive rare earth elements, cathode layer battery shedding, poor thermal matching, etc., and achieve good oxygen ion Conductivity, avoidance of impurity phase problems, effects of high electronic conductivity

Inactive Publication Date: 2012-07-04
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high price of rare earth elements, the development of this series of cathode materials will be limited; in particular, the thermal expansion coefficient of these materials is relatively high, resulting in poor thermal matching with solid electrolyte materials, which will cause the cathode layer to be damaged during battery preparation or battery work. The process falls off or the battery cracks

Method used

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  • Cathode material of mesotherm solid oxide fuel battery and preparation method thereof
  • Cathode material of mesotherm solid oxide fuel battery and preparation method thereof
  • Cathode material of mesotherm solid oxide fuel battery and preparation method thereof

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Effect test

Embodiment 1

[0025] Embodiment 1 cathode material optimum component of the present invention

[0026] The rare earth element Ln is selected as Sm, and a series of cathode materials Sm in which the alkaline earth metal element A is Ca is prepared according to different molar ratios. 1-x Ca x BaCo 2 o 5+δ (x=0.1, 0.2, 0.3), compare the prepared intermediate temperature solid oxide fuel cell cathode material Sm 1-x Ca x BaCo 2 o 5+δ (x=0.1, 0.2, 0.3) properties, see figure 1 and Table 1.

[0027] figure 1The cathode material Sm prepared by sintering at 1100℃ for 10 hours 1-x Ca x BaCo 2 o 5+δ (x=0.1, 0.2, 0.3) XRD spectrum of the sample. From figure 1 It can be seen from the figure that the single-phase double perovskite structure cathode material Sm can be obtained from the sample obtained by sintering at 1100°C for 10 hours. 1-x Ca x BaCo 2 o 5+δ .

[0028] Table 1 is the Sm obtained by sintering at 1100°C for 10 hours 1-x Ca x BaCo 2 o 5+δ Sample, the average thermal...

Embodiment 2

[0031] Embodiment 2 The preparation method of cathode material of the present invention

[0032] Press Sm 1-x Ca x BaCo 2 o 5+δ Stoichiometric ratio weighed Sm 2 o 3 , CaCO 3 , BaCO 3 and Co 2 o 3 Wait for the raw materials, put the weighed raw materials in an agate mortar and add alcohol to grind for 1 hour; then press to form at 200-350MPa, calcined at 1000°C for 10 hours; crush the pre-fired samples and grind for 1 hour, Compressed at 200-350MPa, calcined for the second time at 1050°C for 10 hours; crush and grind the sample after the second calcined for 1 hour, press-molded at 200-350MPa, and sintered at 1150°C for 10 hours , obtained Sm 1-x Ca x BaCo 2 o 5+δ series of cathode materials.

[0033] figure 2 It is Sm sintered at 1150℃ for 12 hours 1-x Ca x BaCo 2 o 5+δ XRD spectrum of (x=0.1, 0.2, 0.3). From figure 2 It can be seen that when x=0.3, there are impurity phase components in the XRD spectrum of the sample. It shows that when x=0.3, the samp...

Embodiment 3

[0034] Embodiment 3 The preparation method of cathode material of the present invention

[0035] 1. Follow Y 1-x Sr x BaCo 2 o 5+δ The stoichiometric ratio of Y 2 o 3 , BaCO 3 , SrCO 3 and Co 3 o 4 , Put the above oxide powder into an agate mortar and add alcohol to grind it thoroughly for 1 hour, then press it at 200-350MPa and place it in a furnace for calcination at 1000°C for 12 hours. The pre-calcined sample was crushed and ground for 1 hour, pressed and formed at 200-350 MPa, and calcined for the second time at 1050°C for 12 hours.

[0036] 2. Grind the above-mentioned calcined sample into powder, press molding at 220-350MPa, and finally put it in a muffle furnace for sintering at 1100°C for 20 hours, and cool it down to room temperature to obtain a double perovskite structure Y 1-x Sr x BaCo 2 o 5+δ cathode material.

[0037] image 3 Y is obtained by sintering at 1100°C for 20 hours 0.5 Sr 0.5 BaCo 2 o 5+δ The XRD spectrum, from image 3 It can be s...

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Abstract

The invention provides a cathode material of a mesotherm solid oxide fuel battery and a preparation method thereof, belonging to the technical field of solid oxide fuel batteries. The general molecular formula of the cathode material is Ln1-xAxBaCo205+delta, wherein Ln is a rare earth metal element, A is an alkaline-earth metal element, and x is larger than 0 and less than 0.5. The preparation method has the following steps: grinding and mixing rare earth oxide, alkaline-earth metalcarbonate, oxide of Co which are weighed in a chemical dosage ratio; respectively sintering for 10-20 hours at the temperatures of 1000 and 1150 DEG C at the air atmosphere and simultaneously grinding during the process; and finally, sintering for 10-20 hours at the temperature of 1100-1150 DEG C, so as to obtain the cathode material in a double-calcium titanium ore structure. The cathode material has the advantages of single phase component, high conductivity, low thermal expansion coefficient, good chemical matching with an electrolyte material and suitability for serving as the cathode material of the mesotherm solid oxide fuel battery.

Description

technical field [0001] The invention relates to the technical field of solid oxide fuel cells, in particular to a cathode material of a medium-temperature solid oxide fuel cell with a double perovskite structure and a preparation method thereof. Background technique [0002] A solid oxide fuel cell is an efficient and clean energy source, which is composed of a cathode, an anode and an electrolyte between the two. Solid oxide fuel cell cathode materials require good stability and high electron-ion mixed conductivity in a high-temperature oxidizing atmosphere, and must also have good catalytic performance and good chemistry with corresponding electrolyte materials. compatibility. The prior art closest to the present invention is two papers on double perovskite structure cathode materials published in 2008, entitled "LnBaCo 2 o 5+δ Oxides as Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells, Journal of The Electrochemical Society, 155(4)(2008)B385-B390" and "Synt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/04H01M4/86H01M4/88
CPCY02E60/50
Inventor 贺天民段文晔
Owner JILIN UNIV
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