A Low-Strain Lithium Cathode Material Li2–2xFe1+xCl4 for Halide-Based All-Solid-State Batteries

IF 19.3 1区材料科学 Q1 CHEMISTRY, PHYSICAL

ACS Energy Letters Pub Date : 2025-02-27 DOI:10.1021/acsenergylett.4c0314710.1021/acsenergylett.4c03147

Dezhao Peng, Rui Li, Kaiqi Xu, Rui Si*, Zhizhen Zhang* and Yong-Sheng Hu*,

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Abstract

Halide electrolytes are of particular interest due to their high ionic conductivity and ductile nature. However, halide-electrolyte-based all-solid-state batteries (ASSBs) are subject to degradation when conventional layer oxide cathodes are used. Herein we report a class of halide cathode materials, Li_2–2xFe_1+xCl₄ (0 ≤ x ≤ 1/3). Among this series, Li₂FeCl₄ experiences no phase changes upon the (de)lithiation process, contributing to exceptionally high reversibility and stable cycling. ASSBs utilizing Li₂FeCl₄ as the cathode demonstrate good rate performance (122.4 mAh g^–1 at 0.2C rate and 91.4 mAh g^–1 at 10C rate) and cycling stability (i.e., a capacity retention of 85.1% is maintained upon 5000 cycles at 10C rate). By optimizing the Li/Fe ratio in Li_2–2xFe_1+xCl₄, a maximum lithium storage capacity of 155.2 mAh g^–1 was achieved with Li_4/3Fe_4/3Cl₄, which is comparable to that of a commercial LiFePO₄ cathode. This study proves the advantage of halide cathode materials in halide-based ASSBs.

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来源期刊

ACS Energy Letters Energy-Renewable Energy, Sustainability and the Environment

CiteScore

31.20

自引率

5.00%

发文量

469

审稿时长

1 months

期刊介绍： ACS Energy Letters is a monthly journal that publishes papers reporting new scientific advances in energy research. The journal focuses on topics that are of interest to scientists working in the fundamental and applied sciences. Rapid publication is a central criterion for acceptance, and the journal is known for its quick publication times, with an average of 4-6 weeks from submission to web publication in As Soon As Publishable format. ACS Energy Letters is ranked as the number one journal in the Web of Science Electrochemistry category. It also ranks within the top 10 journals for Physical Chemistry, Energy & Fuels, and Nanoscience & Nanotechnology. The journal offers several types of articles, including Letters, Energy Express, Perspectives, Reviews, Editorials, Viewpoints and Energy Focus. Additionally, authors have the option to submit videos that summarize or support the information presented in a Perspective or Review article, which can be highlighted on the journal's website. ACS Energy Letters is abstracted and indexed in Chemical Abstracts Service/SciFinder, EBSCO-summon, PubMed, Web of Science, Scopus and Portico.