Reevaluating the Effect of a LiF-Containing Solid Electrolyte Interphase on Lithium Metal Anodes

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-04-30 DOI:10.1021/acs.nanolett.5c00675

Chengkun Liu, Kaixiang Ren, Shilin Wu, Yuhang Zhang, Hai-Wen Li, Meng Yao, Zhipeng Jiang, Yongtao Li

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Abstract

Developing high-energy-density lithium metal batteries (LMBs) necessitates robust solid electrolyte interphases (SEIs) capable of enduring prolonged cycling. While lithium fluoride (LiF) is recognized as crucial for lithium metal anode (LMA) protection, the effects of different LiF sources in SEIs remain insufficiently understood. In this study, we systematically introduce single fluorine sources─anion LiF, solvent LiF, and native LiF─into a fluoride-free electrolyte system to elucidate the impact of LiF originating from different sources on the SEI composition and properties. Results reveal that SEI performance depends not only on LiF content but also on coexisting organic components. During deep cycling, solvent-derived LiF-rich SEIs, containing elevated LiF and organics, offer superior LMA protection ability. These SEIs maintain structural integrity during significant volume changes, effectively suppressing dead Li formation and achieving enhanced Coulombic efficiency. This work reexamines LiF’s protective mechanisms while advancing SEI chemistry understanding, providing critical insights for developing high-performance LMBs.

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含锂离子固体电解质界面对锂金属阳极影响的再评价

开发高能量密度锂金属电池（lmb）需要坚固的固体电解质界面（sei），能够承受长时间的循环。虽然氟化锂（LiF）被认为是锂金属阳极（LMA）保护的关键，但不同的LiF来源在sei中的影响仍然没有得到充分的了解。在本研究中，我们系统地将单氟来源─阴离子LiF、溶剂LiF和天然LiF─引入到无氟电解质体系中，以阐明不同来源的LiF对SEI组成和性能的影响。结果表明，SEI性能不仅取决于LiF含量，还取决于共存的有机成分。在深度循环过程中，溶剂衍生的富liff SEIs，含有较高的liff和有机物，提供卓越的LMA保护能力。这些SEIs在显著体积变化时保持结构完整性，有效抑制死锂地层，提高库仑效率。这项工作重新审视了liff的保护机制，同时推进了对SEI化学的理解，为开发高性能lmb提供了关键见解。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.