Abstract
In this paper, the stability in humid air of Li5La3Ta2O12 lithium ionic conductors synthesized by conventional solid-state reaction was investigated by internal friction, conductivity, weight variation, X-ray diffraction, and thermogravimetric analysis methods. It was found that when the Li5La3Ta2O12 samples were aged in open air at room temperature, the internal friction peaks associated with the short-distance diffusion of lithium vacancies gradually shift toward higher temperature and increase in height, while the weight of the sample increases and impurity phases of LiOH·H2O appear. These results reveal that the Li5La3Ta2O12 compounds are unstable against moisture in open air at room temperature. It was suggested that the protons from the moisture substitute the lithium ions in Li5La3Ta2O12 samples to form Li2O and new protonic derivatives, Li5−x La3Ta2O12−x (OH) x (0<x<2.15), and the resultant Li2O may react further with water to form LiOH·H2O.
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