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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
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立方酸化アルギロジットのリチウム分布によるイオン伝導性の制御 Li6+P1-SiO5Cl
Alexandra Morscher1, Benjamin B Duff1,2, Guopeng Han1
1Department of Chemistry, University of Liverpool, Crown Street, L69 7ZDLiverpool, U.K.
Journal of the American Chemical Society
|November 22, 2022
まとめ
研究者は,イオン輸送のための新しい酸化アルギロサイト,Li7SiO5Clを開発しました. シリコンをリンで置き換えると,無秩序な構造を安定させ,固体アプリケーションのイオン伝導性を大幅に高めます.
科学分野:
- 材料科学
- 固体化学
- 電気化学
背景:
- アルギロダイト構造はイオン輸送材料,特に硫化物ベースの固体リチウムイオン導体にとって不可欠です.
- オキシドアルギロジートはほとんど未調査ですが,イオン伝導性と安定性の改善の可能性があります.
- リチウムイオンの分布は,アルギロジトの格子の中で導電性に重大な影響を及ぼします.
研究 の 目的:
- リチウムに富んだ新しい酸化アルギロジート,Li7SiO5Clを合成し,特徴づけること.
- オキシードアルギロジットの構造変化と リチウム部位の占有率を調査する.
- オキシードアルギロジットのイオン伝導性を強化する.
主な方法:
- Li7SiO5Clの結晶化と,異なる温度でのX線 difraktionによる構造分析.
- Li6+xP1-xSixO5Clの固体溶液を合成して,乱れた構造を安定させる.
- 構成と温度の関数としてのイオン伝導度測定
主要な成果:
- Li7SiO5Clという新しい立方酸化アルギロジートは,室温でP213構造を有していることが判明した.
- 473 Kで,超離子硫化アルギロジットに類似した,乱れたF4̅3m構造への相移行が発生する.
- Li6+xP1-xSixO5Cl (0.3 < x < 0.85) でSi4+をP5+に置き換えると,室温で乱れたF4̅3m構造を安定させ,x=0.75で最大イオン伝導率1.82(1) ×10^-6 S cm^-1を達成する.
結論:
- P置換によって安定した乱れたF4̅3m構造は,酸化アルギロジットのイオン伝導性を著しく高めます.
- 開発された酸化アルギロジットは,硫化物と比較して優れた大気安定性とリチウム金属適合性を示す.
- 構成制御は,オキシドアルギロジット材料のイオン伝導性を高度なアプリケーションに合わせるための経路を提供します.
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