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BULLETIN OF THE CHINESE CERAMIC SOCIETY ›› 2024, Vol. 43 ›› Issue (8): 3053-3062.

• New Functional Materials • Previous Articles     Next Articles

Synthesis of Silicon/Silicon Carbide Nanocomposites from Silica Fume and Investigation of Its Lithium Storage Performance

HUANG Haiming1,2,3, DU Jing1,2,3, XIE Jieyang1,2,3, CHEN Qingze1,2,3, ZHU Runliang1,2,3   

  1. 1. CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou 510640, China;
    2. CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2024-01-15 Revised:2024-04-10 Online:2024-08-15 Published:2024-08-12

Abstract: The volumetric expansion of silicon anodes in lithium-ion batteries leads to a shortened cycling life and rapid capacity decay. Consequently, it is imperative to enhance the cyclic stability of silicon anode materials. In this study, we employed a molten salt-assisted magnesiothermic reduction method and successfully devised a silicon nanomaterial reinforced with silicon carbide (SF-Si) by utilizing silica fume containing elemental carbon, which is an industrial solid waste. The resulting SF-Si sample not only retained the SiC present in the silica fume but also converted the elemental carbon into SiC, achieving a SiC content of 16.4% (mass fraction). Comparative analysis with silicon material prepared from heat-treated silica fume without elemental carbon removal (H-SF-Si) revealed that SF-Si exhibited superior cyclic and rate performance. It attained a high specific capacity of 2 584.76 mAh·g-1 in the first cycle, maintained an 83% capacity retention after 100 cycles, and even at a high current density of 5 A·g-1, the average capacity remained at 877.28 mAh·g-1. These enhancements were primarily attributed to the higher SiC content. The study underscores the potential application of silica fume in the domain of silicon anodes for lithium-ion batteries, with its carbon element playing a constructive role in the preparation of silicon-based nanomaterials.

Key words: silicon/silicon carbide nanocomposite, silica fume, magnesiothermic reduction, lithium-ion battery, anode material, industrial solid waste

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