산화물계 고체 전해질 LATP에 Al₂O₂ 분말 원자층 증착 (PALD)이 미치는 영향
Effects of Al2O3 powder atomic layer deposition (PALD) on oxide-based solid electrolyte LATP
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초록
리튬 이온 배터리와 관련된 화재 및 안전 문제에 대한 우려가 증가하면서 배터리와 같은 전기화학적 에너지 저 장 장치의 핵심 구성 요소인 고체 전해질(SSE)에 대한 많은 연구가 진행되고 있다. 고체 전해질의 주요 장점으로는 높은 안전성, 향상된 에너지 밀도, 내구성이 있다. NASICON 구조를 가진 LATP(Li1.3Al0.3Ti1.7(PO4)3)는 빠른 리튬 이온 이동을 가능하게 하며, 높은 이온 전도성, 화학적 안정성, 우수한 전기화학적 호환성을 제공한다. 본 연구에서는 기술을 사용하여LATP 분말을 얇은 Al2O3 층으로 코팅함으로써 이온 전도성과 환경적 안정성을 개선할 가능성을 평가하였다. 결과적으로 Al2O3 코팅이 LATP의 계면 안정성과 내습성을 효과적으로 향상시키며, 이로 인해 이온 전도성 특성이 개선됨을 확인하였다. 이러한 연구 결과는 이 접근법이 전고체 배터리(ASSB, All Solid-State Battery)의 상업적 실현 가능성을 높이기 위해 생 산 및 저장을 촉진하는 유망한 경로를 제공할 수 있음을 시사한다.
Abstract
Recent concerns about fires and safety issues associated with lithium-ion batteries have been increasing. As a result, interest in solid-state electrolytes (SSE), a key component of electrochemical energy storage devices like batteries, is growing. The main advantages of solid electrolytes include high safety, enhanced energy density, and durability. LATP (Li1.3Al0.3Ti1.7(PO4)3), characterized by a NASICON structure, facilitates rapid lithium-ion movement and offers high ionic conductivity, chemical stability, and excellent electrochemical compatibility. In this study, we evaluated the potential to improve ionic conductivity and environmental stability by coating LATP powder with a thin alumina (Al2O3) layer using Powder Atomic Layer Deposition (PALD) technology. The results confirmed that the Al2O3 coating effectively enhances LATP’s interfacial stability and moisture resistance, thereby contributing to improved ionic conductivity properties. These findings suggest that this approach provides a promising pathway to facilitate the production and storage of all-solid-state batteries (ASSB), enhancing their commercial viability.
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