Synthesis of α-LiAlO2 powders of controlled particle size composition for a matrix electrolyte based on carbonate melts

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Resumo

Three methods of synthesis α-LiAlO2 powders for the preparation of a matrix electrolyte for a molten carbonate fuel cell have been considered. The submicron fraction with a specific surface area of 79 m2/g was obtained from an aqueous solution by spray pyrolysis and the large rod-shaped fractions with particles up to 19 μm in length were obtained by synthesis in halide melt and in aqueous solution. Tape casted ceramic matrices were tested in the single fuel cell with 53Li2CO3–47Na2CO3 melt as an electrolyte. The matrices have demonstrated good gas tightness; nitrogen inleakage in anode space did not exceed 0.6 % during 1100 h lifetime test, which included 15 thermal cycles with cooling the cell below melting point of the electrolyte.

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Sobre autores

A. Tolkacheva

Institute of High Temperature Electrochemistry

Autor responsável pela correspondência
Email: a.s.tolkacheva@urfu.ru
Rússia, Yekaterinburg

M. Konopelko

Institute of High Temperature Electrochemistry

Email: a.s.tolkacheva@urfu.ru
Rússia, Yekaterinburg

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2. Fig. 1. Phase composition of lithium aluminates synthesized by hydrothermal and spray pyrolysis.

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3. Fig. 2. Granulometric analysis of α-LiAlO2, spray pyrolysis, before and after ultrasound treatment.

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4. Fig. 3. Phase composition of lithium aluminate synthesized in a 22LiF–31LiCl–47LiBr melt at 450oC, annealed at 600oC semi–finished product synthesized at 600oC for 10 and 24 hours; symbols indicate: ♦ - α–LiAIO2, ♣ - LiF, peaks not marked in the figure belong to complex lithium-aluminum hydroxides.

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5. Fig. 4. Micrographs of α-LiAlO2 powder obtained by synthesis in a 22LiF–31LiCl–47LiBr melt.

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6. Fig. 5. Micrographs of α-LiAlO2 powder obtained by hydrothermal synthesis.

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7. Fig. 6. Nitrogen influx (* left scale) and cell polarization at 20 mA/cm2 (• right scale), 650 °C.

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8. Fig. 7. Phase composition of the matrix after thermal cycling of the fuel cell.

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