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. 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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Pleiades Publishing
Copyright © 2015 by Pleiades Publishing, Ltd.
Chemistry; Chemistry/Food Science, general; Industrial Chemistry/Chemical Engineering
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