Process for the production of .beta.-lithium aluminate and needl

Details Process for the production of .beta.-lithium aluminate and needl Process for the production of .beta.-lithium aluminate and needl

1978-03-14

1979-08-14

Carter, Herbert T.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

429193, C01F 702

Patent

active

041645570

ABSTRACT:
A process for the production of .beta.-lithium aluminate LiAlO.sub.2, is disclosed wherein a lithium hydroxide aluminate of the formula: Li.sub.2 O . Al.sub.2 O.sub.3 . nH.sub.2 O is precipitated from aqueous solutions which contain the lithium ions and aluminum in ionogenic or elementary form at a pH value above 7. The concentration of the two metal components is at least 0.1, at most 6 g-atoms per liter, preferably 2 to 5 g-atoms per liter. The precipitation product is washed and dried and then is converted by annealing into .beta.-lithium aluminate, in the temperature range between 200.degree. C. and 800.degree. C., preferably 400.degree. C.-650.degree. C., and especially 450.degree. C.-550.degree. C. The .beta.-LiAlO.sub.2 obtained thereby has a lamellae-shaped or fine crystalline form which is converted into a needle-shaped, crystalline lithium aluminate, is obtained by the process of the invention and is suitable for the construction of electrolyte matrices.

REFERENCES:
patent: 3859427 (1975-01-01), Francis et al.
patent: 3878296 (1975-04-01), Vine et al.
patent: 3998939 (1976-12-01), Mason et al.
patent: 4029755 (1977-06-01), Gazza et al.
Horan et al., "Journal of American Chem. Soc.", vol. 57, pp. 2434-2436, 1935.

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