4.7 Article

Solid-state reaction synthesis of amorphous/nanostructured Si@SiOx-Cu3Si composites by mechanical milling for lithium-ion anodes

期刊

JOURNAL OF ALLOYS AND COMPOUNDS
卷 905, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.164207

关键词

Lithium ion battery; Anode; Amorphous Si; Mechanical milling; Raman spectroscopy

资金

  1. National Natural Science Foundation of China [51701073]
  2. Natural Science Foundation of Hunan Province [2018JJ3241]

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In this study, an effective method for obtaining amorphous/nanocrystalline silicon was developed and applied to improve the cycle stability of conductive materials. The experimental results demonstrate that this amorphous/nanocrystalline silicon exhibits excellent electrochemical properties and can be used as an anode material in lithium-ion batteries to enhance energy density.
In present study we developed an effective way to obtain amorphous/nanocrystalline Si in high-capacity Si based composites for improving their cycle stability as lithium-ion anodes. Amorphous/nanostructured Si@ SiOx-Cu3Si composites were synthesized via solid-state reactions using mechanical milling with bulk Si and CuO as starting materials. The microstructural characterization of Si@SiOx-Cu3Si composites demonstrated the phase transformation during the synthesis process of mechanical milling. The ratio and fine-scale distribution of amorphous Si in Si@SiOx-Cu3Si composites were quantitatively analyzed by confocal mu-Raman spectroscopy. The electrochemical properties indicated that Si@SiOx-Cu3Si composites exhibited enhanced cyclability due to containing a highly disordered amorphous Si. Calculated in a full-cell stack model, the lithium-ion cell using Si@SiOx-Cu3Si anodes could provide higher energy density over commercial graphite.(C) 2022 Elsevier B.V. All rights reserved.

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