Aluminum substituted silicon doped apatite type lanthanum silicate solid electrolyte and preparation method thereof

A solid electrolyte, silicon doping technology, applied in the direction of circuits, fuel cells, electrical components, etc., can solve the problems of restricting development and achieve the effect of improving conductivity, increasing vacancy concentration, and multi-transmission space

Inactive Publication Date: 2016-05-25
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nowadays, the synthesis techniques of apatite-type lanthanum silicate mainly include high-temperature solid-phase method and sol-gel method, but their respective shortcomings limit their further development.

Method used

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  • Aluminum substituted silicon doped apatite type lanthanum silicate solid electrolyte and preparation method thereof
  • Aluminum substituted silicon doped apatite type lanthanum silicate solid electrolyte and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] According to the molar ratio La:Si:Al=9.33:5.5:0.5, weigh La in turn 2 O 3 , Ethyl Orthosilicate and Al(NO 3 ) 3 , Use proper amount of absolute ethanol and HNO 3 Fully dissolve, then add urea and ethyl orthosilicate, heat and stir at 40°C to form a precursor solution, adjust the pH to 4 with ammonia water, and place it in a water bath device at 80°C. After 3 hours of heat preservation, a colorless and transparent precursor solution is obtained. glue. Put the precursor gel in a muffle furnace preheated to 600℃, the gel will quickly evaporate and burn when heated, accompanied by a light yellow burning flame, the whole burning process lasts about 5-7min, and white sponge-like foam powder is obtained body. The primary product is ground and calcined at 800°C for 12 hours to obtain high-purity La with good crystallization 9.33 Si 5.5 Al 0.5 O 25.75 Powder. The calcined powder obtained is further ground, pressed and molded at a pressure of 250 MPa, and sintered at 1400° C. fo...

Embodiment 2

[0023] According to the molar ratio La:Si:Al=9.33:5:1, weigh La in turn 2 O 3 , Ethyl Orthosilicate and Al(NO 3 ) 3 , Use proper amount of absolute ethanol and HNO 3 Fully dissolve, then add urea and ethyl orthosilicate, heat and stir at 40℃ to evenly form a precursor solution, adjust the pH to 5 with ammonia water, and place it in a water bath device at 80℃. After 3 hours of heat preservation, a colorless transparent precursor solution is obtained. glue. Put the precursor gel into a muffle furnace preheated to 550℃, the gel will quickly evaporate and burn when heated, accompanied by a light yellow burning flame, the whole burning process lasts about 5-7min, and white sponge-like foam powder is obtained body. The primary product is ground and calcined at 850°C for 10 hours to obtain high-purity La with good crystallization 9.33 Si 5 AlO 25.75 Powder. The calcined powder obtained is further ground, pressed and molded at a pressure of 250 MPa, and sintered at 1500° C. for 3 hour...

Embodiment 3

[0025] According to the molar ratio La:Si:Al=9.33:4:2, weigh La in turn 2 O 3 , Ethyl Orthosilicate and Al(NO 3 ) 3 , Use proper amount of absolute ethanol and HNO 3 Fully dissolve, then add urea and ethyl orthosilicate, heat and stir at 40°C and mix uniformly to form a precursor solution, adjust the pH to 6 with ammonia water, and place it in a water bath device at 80°C for 3h to obtain a colorless transparent gel. Put the gel in a muffle furnace preheated to 650°C, the gel quickly evaporates and burns when heated, accompanied by a light yellow burning flame, the entire burning process lasts about 5-7 minutes, and a white sponge-like foam powder is obtained. The primary product is ground and calcined at 900°C for 8 hours to obtain high-purity La with good crystallization 9.33 Si 4 Al 2 O 25 Powder. The calcined powder obtained is further ground, pressed and molded under a pressure of 250 MPa, and sintered at 1600° C. for 3 hours to obtain an apatite-type lanthanum silicate soli...

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Abstract

The invention relates to an aluminum-silicon-doped apatite-type lanthanum silicate solid electrolyte, and a preparation method thereof. A chemical formula of the aluminum-silicon-doped apatite-type lanthanum silicate solid electrolyte is La9.33Si6-XAlXO26-X / 2, wherein x value ranges from 0.2 to 2.0. The preparation method comprises the steps of weighing La2O3, an aluminum source and tetraethoxysilane according to stoichiometric proportions as initial raw materials; adding the above materials into a mixed solution of nitric acid and absolute ethyl alcohol for completed dissolution; then adding urea and tetraethoxysilane into the mixed solution to form a precursor solution; adjusting a pH value of the precursor solution, forming a precursor gel after heat preservation; taking out the precursor gel; burning, grinding and compression molding; and finally sintering. The aluminum-silicon-doped apatite-type lanthanum silicate solid electrolyte is low in cost, short in reaction time and simple in preparation process; an ignition time is 5-7 min; and synthesis at a medium-low temperature is achieved. The obtained product has high purity, and conductivity of the lanthanum silicate electrolyte is increased.

Description

Technical field [0001] The invention relates to an apatite lanthanum silicate solid electrolyte doped with aluminum instead of silicon and a preparation method thereof, and belongs to the technical field of solid oxide fuel cells. Background technique [0002] Solid oxide fuel cell (SOFC) is an energy conversion device that directly converts chemical energy into electrical energy. It has a series of advantages such as high efficiency, environmental friendliness, and long life. It has broad applications in power generation, transportation, aerospace and other fields prospect. The solid electrolyte is the core component of the SOFC, which plays an important role in isolating the reaction gas and transporting oxygen ions, and its electrical conductivity directly affects the performance of the fuel cell. The operating temperature of SOFC is relatively high (800-1000℃), and the performance requirements of electrolytes and electrodes are strict. The traditional yttria-stabilized zirco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1246
CPCY02E60/50
Inventor 黄志良鲁冕石月詹刚陈巧巧池汝安
Owner WUHAN INSTITUTE OF TECHNOLOGY
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