Synthesis of fine particle size lithium aluminate for application in molten carbonate fuel cells. [625 to 975/sup 0/ K]

Journal Article · Mon Oct 01 00:00:00 EDT 1979 · Mater. Res. Bull.; (United States)

DOI:https://doi.org/10.1016/0025-5408(79)90016-3· OSTI ID:5872539

Kinoshita, K; Sim, J W; Kucera, G H

Lithium aluminate (LiAlO/sub 2/) was synthesized by heat treatment of various types of aluminas (..gamma..-Al/sub 2/O/sub 3/, ..cap alpha..-Al/sub 2/O/sub 3/, ..gamma..-AlOOH, and Al(OH)/sub 3/), Li/sub 2/CO/sub 3/ or LiOH, and Li/sub 2/CO/sub 3/-K/sub 2/CO/sub 3/. For this procedure, the temperature (625 to 975/sup 0/K) and time (1.5 to 90 h) of heat treatment were varied to determine the optimum conditions to obtain ..gamma..-LiAl1O/sub 2/ of high surface area, which was suitable for electrolyte structures in molten carbonate fuel cells. A mixture of Li/sub 2/CO/sub 3/-K/sub 2/CO/sub 3/ and high surface area ..gamma..-LiAlO/sub 2/ was obtained by the heat treatment of ..gamma..-Al/sub 2/O/sub 3/, LiOH, and Li/sub 2/CO/sub 3/-K/sub 2/CO/sub 3/ at 775 K for 2 h, then at 975 K for 16 h. However, when ..gamma..-AlOOH, Al(OH)/sub 3/, and ..cap alpha..-AL/sub 2/O/sub 3/ were substituted for ..gamma..-Al/sub 2/O/sub 3/ in the synthesis procedure, ..cap alpha..-, BETA-, and ..gamma..-LiAlO/sub 2/ were obtained. A mixture of Li/sub 2/CO/sub 3/-K/sub 2/CO/sub 3/ and a mator phase of ..cap alpha..-LiAlO/sub 2/ was obtained by heat treatment of alumina, Li/sub 2/CO/sub 3/, and Li/sub 2/CO/sub 3/-K/sub 2/CO/sub 3/ at 875 to 975/sup 0/K for 23 to 90 h; this material is not suitable for electrolyte structures.

• Research Organization: Argonne National Lab., IL
• OSTI ID: 5872539
• Journal Information: Mater. Res. Bull.; (United States), Vol. 14:10
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINATES
PHYSICAL PROPERTIES
SYNTHESIS
LITHIUM COMPOUNDS
ALUMINIUM OXIDES
CARBONATES
CHEMICAL REACTIONS
ELECTROLYTES
FUEL CELLS
HEAT TREATMENTS
LITHIUM HYDROXIDES
PARTICLE SIZE
PHASE STUDIES
POWDERS
SURFACES
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
CARBON COMPOUNDS
CHALCOGENIDES
DIRECT ENERGY CONVERTERS
ELECTROCHEMICAL CELLS
HYDROGEN COMPOUNDS
HYDROXIDES
OXIDES
OXYGEN COMPOUNDS
SIZE
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360204 - Ceramics
Cermets
& Refractories- Physical Properties