Highly efficient tin fluoride nanocomposite with conductive carbon as a high performance anode for Li-ion batteries

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作   者：

Jamil M.A.;  Ali G.;  Khan K.I.;  Jan Iftikhar F.;  Zaman S.;  Shaikh S.F.;  Pandit B.;  Wali Q.;  Patil S.A.; 

作者机构：

USPCASE National University of Sciences and Technology (NUST);  Department of Physics Karakorum International University Gilgit;  Department of Nanotechnology and Advanced Materials Engineering Sejong University;  Department of Materials Science and Engineering and Chemical Engineering Universidad Carlos III de Madrid;  NUTECH School of Applied Sciences and Humanities National University of Technology;  Department of Chemistry College of Science King Saud University;  Faculty of Materials and Chemical Engineering Ghulam Ishaq Khan Institute of Engineering Sciences and Technology;  Department of Physics University of Kotli Azad Jammu and Kashmir; 

关键词：

Lithium-ion batteries;  Anode;  Alloying;  Nanocomposite;  Diffusion; 

期刊名称：

Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics

i s s n：

0925-8388

年卷期：

2022 年 900 卷

页   码：

163447-

页   码：

摘   要：

High capacity anode materials with long cycle life are required for next-generation high energy density lithium-ion batteries. Herein, SnF2/C nanocomposite is prepared using facile ball-milling method with the advantages of high capacity and stable cycling. The nanocomposite is prepared with significant particle size reduction and wrapped with a thick carbon layer as confirmed from scanning and transmission electron microscopies. The SnF2/C nanocomposite electrode demonstrates 768 mA h g?1 in the 100th cycles with a good retention of 90%. The prepared SnF2/C nanocomposite exhibits specific capacities of 974, 798, 743, 693, 632, and 565 mA h g?1 at rates of 0.1, 0.2, 0.5, 1.0, 2.0, and 5.0 C, respectively, demonstrating high rate capability. SnF2/C anode recovers a specific capacity of 765 mA h g?1 at 0.1 C after testing at high rates. Lithium diffusivity into SnF2/C nanocomposite is calculated to be 1.2 × 10?15 cm2 s?1 at the pristine state and 7.6 × 10?15 cm2 s?1 after 100 cycles using electrochemical impedance spectroscopy. The high performance of the nanocomposite is investigated using ex-situ X-ray diffraction and transmission electron microscopy. The obtained ex-situ results indicate that the nanocomposite undergoes both conversion and alloying reactions during the discharge-charge process.