Defect Control and Lithium-Ion Conducting Properties of Layered Perovskite Oxides Li2SrTa2O7

Abstract:

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Lithium-ion conducting properties were investigated for a layered perovskite oxide Li2SrTa2O7 (LST) and defect-controlled LST, synthesized via solid state reactions. The ionic conductivities of A-site solid solutions Li2[Sr-(La2/3□1/3)-(La1/2Li1/2)]Ta2O7 (□ denotes vacancy.) suggested that lithium ions migrate in the Li-layer. The conductivity of Li-deficient (Li2-z□z)(LazSr1-z)Ta2O7 increased dramatically from 4.2 × 10-6 S cm-1 (z = 0, LST) to 1.6 × 10-3 S cm-1 (z = 0.2) at 400°C with increasing Li-vacancy concentration. This result obviously indicates that the conductivity of LST originate from the Li migration through vacancies in the Li-layer.

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Periodical:

Edited by:

Kazumi Kato, Tadashi Takenaka, Masasuke Takata and Kazuo Shinozaki

Pages:

69-72

DOI:

10.4028/www.scientific.net/KEM.388.69

Citation:

T. Fukushima et al., "Defect Control and Lithium-Ion Conducting Properties of Layered Perovskite Oxides Li2SrTa2O7", Key Engineering Materials, Vol. 388, pp. 69-72, 2009

Online since:

September 2008

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$35.00

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