完全固体電池の固体電解質におけるリチウムイオン伝導に対する粒度境界の原子スケールの影響
James A Dawson1, Pieremanuele Canepa1, Theodosios Famprikis1,2
1Department of Chemistry, University of Bath , Bath BA2 7AY, U.K.
Journal of the American Chemical Society
|December 12, 2017
まとめ
粒子の境界は,Li3OClのような固体電解質におけるリチウムイオン伝導性を著しく阻害する. 分子ダイナミクスのシミュレーションでは,粒子の境界でより高いアクティベーションエネルギーが検出され,バッテリーの性能に影響を与えます.
科学分野:
- 材料科学
- 電気化学
- 固体イオン
背景:
- 固体電解質はより安全で高性能な全固体リチウムイオン電池の開発に不可欠です
- 多結晶固体電解質の粒子の境界は,イオン輸送とバッテリーの全体的な効率に重大な課題をもたらす.
- 固体電解質の伝導性を最適化するために,原子規模の粒子の境界効果を理解することは不可欠です.
研究 の 目的:
- リチウムイオン輸送に対する穀物境界の影響をリチウム濃度の高い反ペロブスキートLi3OClで調査する.
- 粒子の境界が原子レベルでイオン伝導性に与える影響を定量化する.
- 粒子のサイズと粒子の境界特性に基づいて伝導性を予測するモデルを開発する.
主な方法:
- 大規模な分子動力学シミュレーションが採用されました.
- Li3OClはモデル多結晶固体電解質として使用された.
- 安定した粒子の境界を越えたイオン輸送とリチウムイオン移動の障壁を分析した.
主要な成果:
- 多結晶のLi3OClで高濃度の粒子の境界が予測された.
- リチウムイオン伝導性は,粒子の境界でひどく阻害されていることが判明しました.
- 粒子の境界を越えたリチウムイオン伝導の活性化エネルギーは,大量結晶よりも一貫して高く,高い粒子の境界抵抗性を確認しました.
結論:
- 粒子の境界はLi3OClにおけるリチウムイオン輸送に重大な障壁として作用する.
- 固体電解質の伝導性を最適化するために,微細構造,特に粒子の大きさを調整することが重要です.
- この発見は,全固体電池のための高性能固体電解質の設計のための基本的な洞察を提供します.
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