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摘要
To solve the major defects of SiOx-based anode materials, composite materials with different Si-Fe content and SnO2 were deliberately prepared via a tandem strategy involving mechanical ball milling, spray drying, and high-temperature pyrolysis in this paper. Furthermore, the phase structures, microscopic morphologies, and electrochemical properties of as-obtained materials were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), energy dispersive spectroscopy (EDS), and galvanostatic charge-discharge test system. The electrochemical results show that the composite containing a mass fraction of 5% Si-Fe possesses a relatively good comprehensive electrochemical performance with a charging capacity of 443.4 mAh·g-1 and the first Coulombic efficiency of 75.2%. After 310 cycles, the charging capacity still retained 369.1 mAh·g-1, and the capacity retention rate was up to 81.0%. Meanwhile, the lithium diffusion rate is remarkably improved after Si-Fe incorporation. ? 2023 Chinese Chemical Society.
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