固体電池におけるリチウム金属アノドの疲労

Tengrui Wang¹, Bo Chen¹, Yijie Liu²

¹Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University, Shanghai, China.

Science (New York, N.Y.)

|April 17, 2025

まとめ

固体リチウム金属電池 (SSB) は,リチウム金属アノドの疲労により,デンドライトの成長を引き起こします. この疲労メカニズムの理解は,電気自動車のSSB寿命の改善の鍵です.

科学分野:

材料科学
電気化学
機械工学

背景:

固体リチウム金属電池 (SSB) は,電気自動車に高いエネルギー密度と安全性を提供します.
サイクリング中のリチウムデンドライトの成長は短路を引き起こし,SSBの性能と寿命を制限します.

研究の目的:

固体リチウム金属電池の故障メカニズムを調査する.
バッテリーの分解とデンドライト形成におけるリチウム金属アノードの役割を特定する.

主な方法:

操作中の電池の動作を観察するスキャニング電子顕微鏡 (SEM).
リチウムデンドライトの成長とインタフェースの進化をモデル化するための相場シミュレーション.

主要な成果:

バッテリーの故障はリチウム金属アノドの疲労と直接関係しています
リチウムアノドの疲労は,インターフェースの分解とデンドライトの増殖に大きく寄与する.
観察された疲労の行動は Coffin-Manson 方程式に従っており,本質的な材料の性質を示しています.

結論:

リチウム金属アノドの疲労はSSBの故障の固有の特徴です.
アノド疲労を理解することは,SSBの故障メカニズムの物理的基礎を提供します.
固体リチウム金属電池の使用寿命を延長するには,アノド疲労に対処することが重要です.

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