VERFAHREN ZUR HERSTELLUNG VON BETA-LITHIUMALUMINAT

摘要

A process for the production of beta -lithium aluminate LiAlO2, is disclosed wherein a lithium hydroxide aluminate of the formula: Li2O . Al2O3 . nH2O 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 DEG C. and 800 DEG C., preferably 400 DEG C.-650 DEG C., and especially 450 DEG C.-550 DEG C. The beta -LiAlO2 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.