| Item type |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2016-07-21 |
| タイトル |
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タイトル |
Development of Lithium Stuffed Garnet-Type Oxide Solid Electrolytes with High Ionic Conductivity for Application to All-Solid-State Batteries |
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言語 |
en |
| 言語 |
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言語 |
eng |
| 資源タイプ |
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資源タイプ |
journal article |
| 著者 |
稲田, 亮史
保田, 哲志
東條, 勝
釣谷, 慶次
東城, 友都
櫻井, 庸司
Inada, Ryoji
Yasuda, Satoshi
Tojo, Masaru
Tsuritani, Keiji
Tojo, Tomohiro
Sakurai, Yoji
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| 抄録 |
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内容記述タイプ |
Abstract |
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内容記述 |
All-solid-state lithium-ion batteries are expected to be one of the next generations of energy storage devices because of their high energy density, high safety, and excellent cycle stability. Although oxide-based solid electrolyte (SE) materials have rather lower conductivity and poor deformability than sulfide-based ones, they have other advantages, such as their chemical stability and ease of handling. Among the various oxide-based SEs, lithium-stuffed garnet-type oxide, with the formula of Li7La3Zr2O12 (LLZ), has been widely studied because of its high conductivity above 10−4 S cm−1 at room temperature, excellent thermal performance, and stability against Li metal anode. Here, we present our recent progress for the development of garnet-type SEs with high conductivity by simultaneous substitution of Ta5+ into the Zr4+ site and Ba2+ into the La3+ site in LLZ. Li+ concentration was fixed to 6.5 per chemical formulae, so that the formula of our Li garnet-type oxide is expressed as Li6.5La3−xBaxZr1.5−xTa0.5+xO12 (LLBZT) and Ba contents x are changed from 0 to 0.3. As a result, all LLBZT samples have a cubic garnet structure without containing any secondary phases. The lattice parameters of LLBZT decrease with increasing Ba2+ contents x ≤ 0.10 while increase with x from 0.10 to 0.30, possibly due to the simultaneous change of Ba2+ and Ta5+ substitution levels. The relative densities of LLBZT are in a range between 89 and 93% and are not influenced in any significant way by the compositions. From the AC impedance spectroscopy measurements, the total (bulk + grain) conductivity at 27°C of LLBZT shows its maximum value of 8.34 × 10−4 S cm−1 at x = 0.10, which is slightly higher than the conductivity (= 7.94 × 10−4 S cm−1) of LLZT without substituting Ba (x = 0). The activation energy of the conductivity tends to become lower by Ba substation, while excess Ba substitution degrades the conductivity in LLBZT. LLBZT has a wide electrochemical potential window of 0–6 V vs. Li+/Li, and Li+ insertion and extraction reactions of TiNb2O7 film electrode formed on LLBZT by aerosol deposition are demonstrated at 60°C. The results indicate that LLBZT can potentially be used as a SE in all-solid-state batteries. |
| bibliographic_information |
Frontiers in Energy Research
en : Frontiers in Energy Research
巻 4,
p. 28,
発行日 2016-07-20
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| 出版者 |
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出版者 |
FRONTIERS MEDIA SA |
| item_10001_source_id_9 |
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収録物識別子タイプ |
PISSN |
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収録物識別子 |
2296-598X |
| item_10001_relation_14 |
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関連タイプ |
isIdenticalTo |
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識別子タイプ |
DOI |
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関連識別子 |
10.3389/fenrg.2016.00028 |
| 権利 |
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権利情報 |
© 2016 Inada, Yasuda, Tojo, Tsuritani, Tojo and Sakurai. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
| 関連サイト |
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識別子タイプ |
URI |
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関連識別子 |
http://journal.frontiersin.org/article/10.3389/fenrg.2016.00028/full |
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関連名称 |
FRONTIERS MEDIA SA |
| 出版タイプ |
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出版タイプ |
VoR |
| キーワード |
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主題 |
garnet-type oxide |
| キーワード |
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主題 |
solid electrolyte |
| キーワード |
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主題 |
ionic conductivity |
| キーワード |
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主題 |
all-solid-state battery |
| キーワード |
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主題 |
aerosol deposition |
| キーワード |
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主題 |
garnet-type oxide |
| キーワード |
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主題 |
solid electrolyte |
| キーワード |
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主題 |
ionic conductivity |
| キーワード |
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主題 |
all-solid-state battery |
| キーワード |
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主題 |
aerosol deposition |
f2296598X-0004-28.pdf (5.2 MB)
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