Ionic conductivity of Li/sub 2/O-based mixed oxides and the effects of moisture and LiOH on their electrical and structural properties

Journal Article · Mon Jan 01 04:00:00 EST 1979 · J. Electrochem. Soc.; (United States)

DOI:https://doi.org/10.1149/1.2128980· OSTI ID:6408103

Biefeld, R M; Johnson, Jr, R T

Thermal, structural, and electrical measurements on polycrystalline Li/sub 2/O and certain Li/sub 2/O-based mixed oxides(Li/sub 5/MO/sub 4/(M = Al, Fe, and Ga),Li/sub 2/O + ZnO, LiYO/sub 2/, and Li/sub 2/O + Y/sub 2/O/sub 3/ mixtures) indicate that LiOH is produced within these materials on exposure to a moist environment. The presence of LiOH produces an endothermic reaction at approx. 400/sup 0/C and a large increase in ionic conductivity above approx. 400/sup 0/C (sigma approx. = to 0.1 (..cap omega..-cm)/sup -1/ at 500/sup 0/C). These features are absent under dry conditions (no LiOH). In the dry state, the ionic conductivity varies nearly exponentially with temperature (activation energies of approx. 0.5-1.0 eV) and has values ranging from 10/sup -4/ to 10/sup -3/ (..cap omega..-cm)/sup -1/ at 500/sup 0/C. All of these materials, except possibly for the Y-containing compounds, appear to have common ionic conductivity characteristics. The electrical and structural properties of the Li/sub 5/Mo/sub 4/ compounds are reproducible on cycling between wet (containing LiOH) and dry (no LiOH) conditions. This does not appear to be the case for the other materials. There is a significant (1-50%) electronic contribution to the conductivity in these materials.

• Research Organization: Sandia Labs., Albuquerque, NM
• OSTI ID: 6408103
• Journal Information: J. Electrochem. Soc.; (United States), Journal Name: J. Electrochem. Soc.; (United States) Vol. 126:1; ISSN JESOA
• Country of Publication: United States
• Language: English

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