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차세대 리튬이온전지를 위한 리튬인산철 연구개발동향: 전고체 전해질을 중심으로

Research and Development Trends of Lithium Iron Phosphate for Next-Generation Lithium-Ion Batteries with Emphasis on Solid-State Electrolytes

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한국전기화학회 (The Korean Electrochemical Society)|2024.11|전기화학회지 (Journal of the Korean Electrochemical Society)|제27권 제4호|pp. 115-124|DOI https://doi.org/10.5229/JKES.2024.27.4.115

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키워드

Energy storageLithium iron phosphate batterySolid-state electrolyteIonic conductivity
주제분류화학

초록

안전하고 효율적이며 환경 친화적인 에너지 저장 솔루션에 대한 수요가 증가함에 따라, 높은 열안정성, 긴 수명, 비용 효율성을 요구하는 응용 분야에 리튬 인산철(LFP) 배터리가 주목받고 있다. 그러나, LFP의 상대적으로 낮은 에너지 밀도는 고에너지 응용 분야에서 주요한 한계로 작용하고 있다. 이에 대응하여 LFP 배터리에 전고체 전해질을 통합하는 것이 에너지 밀도와 안전성을 동시에 향상시키기 위한 유망한 전략으로 떠오르고 있다. 전고체 전해질, 특히 전해질(예: Li7La3Zr2O12, LLZO)과 고분자 기반 전해질은 높은 이온 전도성, 화학적 안정성, 비가연성 특성을 제공하여 기존의 액체 전해질이 가진 주요 한계를 극복할 수 있다. 본 리뷰는 차세대 배터리용 LFP와 전고체 전해질의 최근 발전을 종합적으로 분석하며, 전기화학적 성능 최적화를 위한소재 혁신, 계면 공학 및 제조 기법을 소개한다. 최신 연구 동향을 분석하고 향후 방향을 제시함으로써 본 논문은 전고체 LFP 배터리의 경쟁력 있는 성능을 달성하기 위한 최근 연구 성과들을 살펴보고, 친환경 에너지 저장 솔루션에서 이들의 광범위한 활용 가능성을 제시한다.

Abstract

The growing demand for safe, efficient, and environmentally friendly energy storage solutions has spotlighted lithium iron phosphate (LFP) batteries for applications requiring high thermal stability, long cycle life, and cost-effectiveness. However, the comparatively lower energy density of LFP remains a significant limitation for its use in high-energy applications. In response, the integration of solid-state electrolytes (SSEs) with LFP batteries has emerged as a promising strategy to enhance both energy density and safety. Solid-state electrolytes, particularly garnet-type (e.g., Li7La3Zr2O12, LLZO) and polymer-based electrolytes, offer high ionic conductivity, chemical stability, and non-flammable properties, thereby overcoming critical limitations posed by traditional liquid electrolytes. This review comprehensively examines recent advancements in solid-state electrolyte applications for LFP batteries, with a focus on material innovations, interface engineering, and manufacturing techniques aimed at optimizing electrochemical performance. By analyzing the state-of-the-art research and identifying future directions, this paper provides insights into the pathways for achieving competitive performance in solid-state LFP batteries and underscores their potential for widespread adoption in eco-friendly energy storage solutions.

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