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

Takaaki Fukushima; Shinya Suzuki; Masaru Miyayama

doi:10.4028/www.scientific.net/KEM.388.69

Paper Titles

Synthesis and Lithium Ion Conductivity of MP₂O₇-Based Solid Electrolytes
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Shell-Core Type Proton Conducting TiP₂O₇-Based Solid Electrolytes
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Classical Molecular Dynamics Simulations on Fast Li Ion Conduction in (Li,La)TiO₃
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Preparation of Ru Nano-Particles Dispersed on a Highly-Porous Material
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Defect Control and Lithium-Ion Conducting Properties of Layered Perovskite Oxides Li₂SrTa₂O₇
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Oxygen Reduction Electrode Properties of Oxide Nanosheet-Based Materials
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Preparation of High Lithium Ion Conductive Glass-Ceramics Solid Electrolytes in the LiTi₂(PO₄)₃ System by the Mechanochemical Method and their Application as Coating Materials of LiCoO₂
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Electrochemical Properties of Carbon Doped LiFePO₄ Cathode Materials Prepared by Spray Pyrolysis
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Mass Production and Battery Properties of LiNi_0.5Mn_1.5O₄ Powders Prepared by Internal Combustion Type Spray Pyrolysis
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Defect Control and Lithium-Ion Conducting Properties of Layered Perovskite Oxides Li₂SrTa₂O₇

Abstract:

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.