Synthesis, Structure and Ionic Conductivity of Garnet Like Lithium Ion Conductor Li6.25+xGa0.25La3-xSrxZr2O12

Synthesis, Structure and Ionic Conductivity of Garnet Like Lithium Ion Conductor Li6.25+xGa0.25La3-xSrxZr2O12

Lithium ionic conductors which exhibit high ionic conductivity and are stable to lithium metal are demanded as solid electrolytes of all solid-state lithium batteries. Garnet-type lithium ionic conductor, Li6.25+xGa0.25La3-xSrxZr2O12 (LLZ-GaSr) has been synthesized at 1000°C by a solid-state reactio...

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Veröffentlicht in:Journal of the Electrochemical Society 2018-12, Vol.166 (3), p.A5168-A5173
Hauptverfasser: Mori, Daisuke, Sugimoto, Kaoru, Matsuda, Yasuaki, Ohmori, Kenta, Katsumata, Tetsuhiro, Taminato, Sou, Takeda, Yasuo, Yamamoto, Osamu, Imanishi, Nobuyuki
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container_end_page A5173
container_issue 3
container_start_page A5168
container_title Journal of the Electrochemical Society
container_volume 166
creator Mori, Daisuke
Sugimoto, Kaoru
Matsuda, Yasuaki
Ohmori, Kenta
Katsumata, Tetsuhiro
Taminato, Sou
Takeda, Yasuo
Yamamoto, Osamu
Imanishi, Nobuyuki
description Lithium ionic conductors which exhibit high ionic conductivity and are stable to lithium metal are demanded as solid electrolytes of all solid-state lithium batteries. Garnet-type lithium ionic conductor, Li6.25+xGa0.25La3-xSrxZr2O12 (LLZ-GaSr) has been synthesized at 1000°C by a solid-state reaction. Its phase relation, sinterability, structure and ionic conductivities have been investigated. LLZ-GaSr forms cubic phase in x = 0-0.2 as main phase, while it forms tetragonal phase with impurities in x = 0.3-0.5. XRD studies indicate the solubility limit in cubic phase of LLZ-GaSr is around x = 0.1. Sinterability is improved by Sr substitution. The total ionic conductivity of LLZ-GaSr with x = 0.1 at 25°C exhibits 1.3 × 10−3 S cm−1. The symmetrical cell with Li electrodes demonstrates that LLZ-GaSr is stable in Li metal at room temperature for 1.5 month. The Sr-substitution is effective in improvements of sinterability and ionic conductivity of Li6.25Ga0.25La3Zr2O12 (LLZ-Ga).
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