Lattice matching governs interfacial kinetics and conversion reversibility in FeF3 cathodes

IF 3.8 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2026-10-12 DOI:10.1063/5.0349049

Yujia Cheng,Wenzhi Zhang,Zihan Wang,Mingqian Zhang,Jia Yu,Guixin Cao

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引用次数: 0

Abstract

Iron trifluoride (FeF3) conversion-type cathodes generally suffer from bottlenecks including poor interfacial stability and sluggish Li+ transport. Most existing studies have overlooked the critical regulatory effect of the lattice matching relationship between the surface layer and the matrix on electrochemical behaviors. In this work, a lattice-compatible FeF2/FeF3 interface, together with lattice-mismatched CoF3/FeF3 and CuF2/FeF3 interfaces, was in situ constructed on FeF3 substrates. Systematic characterizations confirm that the highly lattice-compatible interface can optimize interfacial transport kinetics, promote the reversible conversion of LiF, and build a stable cathode electrolyte interphase. The modified sample achieves an initial discharge specific capacity of 610 mAh g−1 at 100 mA g−1, and its capacity retention after 100 cycles is 50.0% higher than that of the pristine FeF3. High lattice matching alleviates interfacial strain and reduces the Li+ migration energy barrier, thus improving the reversibility of the conversion reaction. This work proves that lattice-compatible interfacial engineering is one of the vital design guidelines for high-performance FeF3 conversion-type cathodes.

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晶格匹配控制着FeF3阴极的界面动力学和转化可逆性

三氟化铁（FeF3）转换型阴极通常存在界面稳定性差和Li+传输缓慢等瓶颈。现有的研究大多忽略了表面层与基体之间的晶格匹配关系对电化学行为的关键调节作用。本研究在FeF3衬底上原位构建了晶格兼容的FeF2/FeF3界面，以及晶格不匹配的CoF3/FeF3和CuF2/FeF3界面。系统表征证实，高晶格相容性界面可优化界面输运动力学，促进锂离子电池的可逆转化，构建稳定的阴极电解质界面。在100ma g−1下，改性FeF3的初始放电比容量达到610 mAh g−1,100次循环后的容量保持率比原始FeF3高50.0%。高晶格匹配减轻了界面应变，降低了Li+迁移能垒，从而提高了转化反应的可逆性。这项工作证明了晶格兼容界面工程是高性能FeF3转换型阴极的重要设计准则之一。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.