Solid lithium electrolytes in the Li4-3x Fe x GeO4 system were synthesized. Their phase composition, thermal behavior, and electrical conductivity were studied in the temperature interval 300–750°C. Introduction of Fe3+ ions into lithium orthogermanate leads to the formation of a γ-Li3PO4-type structure and to a sharp increase in the conductivity, with a maximum reached at x = 0.075–0.15: about 10−1 S cm−1 at 300°C and more than 1 S cm−1 at 700°C. The main current carriers are interstitial Li+ cations weakly bound with the rigid framework. Owing to high conductivity, the electrolytes studied are of interest for use in high-temperature electrochemical devices.
Russian Journal of Applied Chemistry – Springer Journals
Published: Sep 29, 2013
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