Carbon/LiF-Rich Interfaces Constructed from Lithiation of Fluorinated Carbon Coating on Microsized Silicon Anodes

IF 18.2 1区材料科学 Q1 CHEMISTRY, PHYSICAL

ACS Energy Letters Pub Date : 2025-10-02 DOI:10.1021/acsenergylett.5c02552

Chunyu Cui, Yang Luo, Xiyue Zhang, Hongli Deng, Aoqian Qiu, Yuan Wang, Jian Zhu, Gonglan Ye, Xiulin Fan, Huilong Fei

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Abstract

Microsized silicon particles (Si-MPs) are candidate anodes for lithium-ion batteries, but they suffer from severe volume change during charge/discharge and low electrical conductivity, leading to rapid capacity decay and limited rate capability. Here we address these critical challenges by encapsulating Si-MPs within dual-layer coatings of compact carbon layer and LiF-rich solid electrolyte interface (SEI), which are realized by the electrochemical reduction of fluorinated carbon (FC) precoated on Si-MPs. The formation of LiF via the lithiation of C–F bonds within FC, rather than the electrolyte decomposition, as encountered conventionally, enriches LiF in the inner region of SEI and reduces electrolyte consumption. The dual-layer structure preserves electrode integrity and improves conductivity, allowing the Si-MP anode to deliver 80.8% capacity retention after 500 cycles at 4.0 mAh cm^–2 and to maintain capacities of 2031.9, 1736.3, 1189.7, and 813.8 mAh g^–1 at 0.2 C, 1 C, 3 C, and 5 C, respectively.

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微硅阳极上氟化碳涂层锂化构建富碳/富锂界面

微尺寸硅颗粒（Si-MPs）是锂离子电池的备选阳极，但它们在充放电过程中存在严重的体积变化和低导电性，导致容量衰减快，速率能力有限。在这里，我们通过在Si-MPs上预涂氟化碳（FC）的电化学还原，将Si-MPs封装在致密碳层和富liff固体电解质界面（SEI）的双层涂层中来解决这些关键挑战。通过FC内C-F键的锂化而不是传统的电解质分解来形成LiF，从而丰富了SEI内部区域的LiF并减少了电解质消耗。双层结构保持了电极的完整性并提高了导电性，使Si-MP阳极在4.0 mAh cm-2下循环500次后的容量保持率为80.8%，并在0.2 C, 1 C， 3 C和5 C下分别保持2031.9,1736.3,1189.7和813.8 mAh g-1的容量。

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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.