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Method for preparing apatite type oxide electrolyte powder

An electrolyte and apatite technology, applied in the direction of phosphorus compounds, chemical instruments and methods, solid electrolyte fuel cells, etc., can solve the problems of difficult control of the speed and degree of hydrolysis reaction

Inactive Publication Date: 2008-05-28
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to strictly control the hydrolysis reaction speed and degree of the alkoxide when preparing the apatite-type oxide electrolyte powder, and the hydrolysis reaction speed and degree of the alkoxide are affected by many factors such as the pH value of the solution, water content, temperature, and are difficult to control.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Preparation of apatite-type oxide La 9.33 Ge 6 o 26 Electrolyte powder: put 0.00933mol of lanthanum nitrate and 0.006mol of germanium chloride into a 50ml beaker containing 20ml of ethanol, stir and dissolve completely, add 0.016mol of citric acid, stir and dissolve to form a sol; Heat and stir to evaporate the solvent to form a gel; put the gel in an oven and dry at 80°C to form a raw powder; put the raw powder into a crucible and place it in a heating furnace for calcination at 700°C for 15 hours. Obtain apatite-type oxide La with a particle size of about 50nm 9.33 Ge 6 o 26 .

Embodiment 2

[0017] Preparation of apatite-type oxide La 9.33 Si 6 o 26 Electrolyte powder: put 0.00933mol of lanthanum nitrate and 0.006mol of ethyl silicate into a 50ml beaker containing 30ml of methanol, stir and dissolve completely, add 0.03mol of citric acid, stir and dissolve to form a sol; Heat and stir at ℃ to evaporate the solvent to form a gel; put the gel in an oven and dry at 90°C to form a raw powder; put the raw powder into a crucible and place it in a heating furnace for calcination at 1200°C for 1 hour , to obtain apatite-type oxide La with a particle size of about 300nm 9.33 Si 6 o 26 .

Embodiment 3

[0019] Preparation of apatite-type oxide La 9.33 Si 3 Ge 3 o 26 Electrolyte powder: put 0.00933mol of lanthanum nitrate, 0.003mol of ethyl silicate and 0.003mol of germanium chloride into a 50ml beaker containing 15ml of ethanol, stir and dissolve completely, add 0.02mol of glycine, stir and dissolve to form a sol; Heat and stir at 70°C on a magnetic stirrer to evaporate the solvent to form a gel; put the gel in an oven and dry at 70°C to form a raw powder; put the raw powder into a crucible and place it in a heating furnace at 950 Calcined at ℃ for 5 hours to obtain apatite-type oxide La with a particle size of about 150nm 9.33 Si 3 Ge 3 o 26 .

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Abstract

The invention provides a preparation method of apatite oxide electrolyte powder. The preparation method chooses organic or inorganic precursor which can provide apatite electrolyte components as raw material; the raw material is dissolved in non-aqueous solvent, and the mixed solution and the complexing agent form sol and gel; at last, the apatite oxide electrolyte powder can be obtained by drying, sintering and some other technique process. The particle size is 20-400 nanometers. The preparation method has low requirement on equipment, simple technique, narrow particle distribution and high product purity and the obtained product has even particles.

Description

technical field [0001] The invention belongs to the technical field of fuel cell electrolyte material preparation, and relates to a method for preparing apatite-type oxide electrolyte powder. Background technique [0002] As we all know, solid oxide fuel cells (SOFCs) are energy conversion devices that directly convert chemical energy into electrical energy. They have the advantages of environmental friendliness, high energy conversion efficiency, strong fuel adaptability, and wide application range. A high-tech green energy technology that is competing to develop. At present, traditional SOFCs work at high temperature (~1000°C), which can easily cause a series of technical problems such as adverse interface reactions between electrolyte / electrode, electrode / bipolar plate, electrode active sintering degradation, interface electrochemical performance reduction, and packaging difficulty. making it difficult to commercialize. The medium and low temperature of SOFCs has become...

Claims

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Application Information

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IPC IPC(8): C01B25/32H01M8/02H01M8/10H01M8/1246
CPCY02E60/523Y02E60/50
Inventor 田长安赵娣芳鲁红典张全争尹奇异
Owner HEFEI UNIV
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