Fe/Fe3C modification to effectively achieve high-performance Si–C anode materials

Xuqi Lin; Jingguo Gao; Kehua Zhong; Yongcong Huang; Hurong Yao; Yingbin Lin; Yongping Zheng; Zhigao Huang; Jiaxin Li

doi:10.1039/D2TA06008F

Fe/Fe₃C modification to effectively achieve high-performance Si–C anode materials†

Xuqi Lin,^abc Jingguo Gao,^abc Kehua Zhong,^abc Yongcong Huang,^abc Hurong Yao,^abc Yingbin Lin,

^abc Yongping Zheng,

*^abc Zhigao Huang

*^abc and Jiaxin Li

*^abc

Author affiliations

* Corresponding authors

^a College of Physics and Energy, Fujian Provincial Solar Energy Conversion and Energy Storage Engineering Technology Research Center, Fujian Normal University, Fuzhou, China
E-mail: lijiaxin@fjnu.edu.cn

^b Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials, Fuzhou, China

^c Fujian Provincial Collaborative Innovation Center for Advanced High-field Superconducting Materials and Engineering, Fuzhou, China

Abstract

For high-performance silicon–carbon (Si–C)-based anode materials used in high-energy-density lithium-ion batteries (LIBs), there is an urgent need to rationally construct a stable solid electrolyte interface (SEI) film and load a high proportion of silicon content, which is closely related to the capacity and cycling stability of the electrode. Herein, composites of Fe/Fe₃C-modified carbon nanofiber–coated Si nanoparticles (Fe/Fe₃C–Si@CNFs) were synthesized via a simple electrospinning method. These composites effectively overcome the volume change effect, poor interfacial compatibility and low conductivity, delivering excellent LIB performance. Tested at 2.0 A g⁻¹, Fe/Fe₃C–Si@CNFs provides a high reversible capacity of 956.5 mA h g⁻¹ with a coulombic efficiency of more than 99.5% even after 4000 ultra-long stable cycles. The high conductivity of the Fe/Fe₃C embedded in the CNF framework can promote e⁻ transfer and boost the Li⁺ diffusion kinetics in the electrode. The catalytic activity of Fe/Fe₃C helps to enhance the interfacial compatibility, grow a balanced stable SEI film and promote the long-cycle stability of the electrode at room temperature.

This article is part of the themed collection: Journal of Materials Chemistry A HOT Papers

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Article information

DOI: https://doi.org/10.1039/D2TA06008F
Article type: Paper
Submitted: 29 Jul 2022
Accepted: 29 Sep 2022
First published: 30 Sep 2022

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J. Mater. Chem. A, 2022,10, 23103-23112

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Fe/Fe₃C modification to effectively achieve high-performance Si–C anode materials

X. Lin, J. Gao, K. Zhong, Y. Huang, H. Yao, Y. Lin, Y. Zheng, Z. Huang and J. Li, J. Mater. Chem. A, 2022, 10, 23103 DOI: 10.1039/D2TA06008F

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Journal of Materials Chemistry A