リチウム・リン酸化物 (リポン) の無形構造を解明する
Valentina Lacivita1, Andrew S Westover2, Andrew Kercher2
1Materials Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States.
Journal of the American Chemical Society
|July 24, 2018
まとめ
研究者は,リチウムリン酸化物 (リポン) の固体電解質の構造を完全に解明した. この研究は,窒素が
科学分野:
- 材料科学
- 電気化学
- 固体化学
背景:
- 固体電解質はより安全で高性能な固体リチウム金属電池の開発に不可欠です
- リチウムリン酸化窒素 (リポン) は有望な固体電解質であるが,その正確な原子構造は完全に理解されていない.
- リポンの主要な性能要因には,高リチウム含量,無形性,窒素の組み込みが含まれています.
研究 の 目的:
- リチウム・リン酸化物 (リポン) の原子構造を計算と実験の組み合わせで完全に解明する.
- リポンの構造特性とイオン伝導性に対する窒素の組み込みとリチウム含有量の役割を調査する.
主な方法:
- アブ・イニシオ分子動力学シミュレーション
- 密度関数理論の計算
- 中性子散乱実験 (中性子対分布関数解析)
- 赤外線スペクトル
主要な成果:
- ニュートロンペア分布関数と赤外線スペクトロスコーピーのモデルと実験結果の間の例外的な一致.
- 構造モデルでは,窒素原子がリン酸単位内で橋渡し構造と非橋渡し構造の両方を形成していることが示されています.
- リチウムの含有量が増加すると,イオン伝導性の傾向と相関するブリッジングと頂点窒素の比率の変化が発生します.
結論:
- この研究は,リポンの固体電解質の最初の包括的な構造解明を提供します.
- 橋渡しから頂上窒素構造への観察されたクロスオーバーは,窒素の組み込みによる強化されたイオン伝導性を直接説明する.
- この詳細な構造的な理解は,リポンを先進的な固体電池アプリケーションに最適化するために不可欠です.
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