Lithium-Ion solid electrolytes Li8La3Zr2–0.75x Al x O12.5 and Li9La3Zr2–0.75x Al x O13

Lithium-Ion solid electrolytes Li8La3Zr2–0.75x Al x O12.5 and Li9La3Zr2–0.75x Al x O13 New solid lithium-conducting electrolytes of nominal composition Li8La3Zr2–0.75x Al x O12.5 and Li9La3Zr2–0.75x Al x O13 (x = 0.05–0.30) were obtained. It is shown that the superionic cubic phase can be stabilized for compositions with x > 0.5 by annealing at 1150°C. The electrical conductivity of the electrolytes under study grows with increasing content of Al3+ and reaches the maximum value of 5.9 × 10–5 S cm–1 (at (25°C) at the point x = 0.20 for the Li8La3Zr2–0.75x Al x O12 system and 2.2 × 10–5 S cm–1 at the point x = 0.15 for the Li9La3Zr2–0.75x Al x O13 system. No further rise in the conductivity is observed with increasing x because of the formation of the LaAlO3 and La2Li0.5Al0.5O4 phases. The activation energy of conductivity is approximately constant for all compositions with stabilized cubic structure and is close to 35.8 ± 0.7 kJ mol–1 (Li8La3Zr1.85Al0.20O12.5 composition). The smaller values of the conductivity, compared with the Li7La3Zr2–0.75x Al x O12, are due to the filling of vacant lithium sites in the structure of the cubic LLZ and, accordingly, to the blocking of conduction paths. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Applied Chemistry Springer Journals

Lithium-Ion solid electrolytes Li8La3Zr2–0.75x Al x O12.5 and Li9La3Zr2–0.75x Al x O13

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Publisher
Pleiades Publishing
Copyright
Copyright © 2015 by Pleiades Publishing, Ltd.
Subject
Chemistry; Chemistry/Food Science, general; Industrial Chemistry/Chemical Engineering
ISSN
1070-4272
eISSN
1608-3296
D.O.I.
10.1134/S1070427215050092
Publisher site
See Article on Publisher Site

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