Solid-state reaction synthesis of amorphous/nanostructured Si@SiOx-Cu3Si composites by mechanical milling for lithium-ion anodes
Liu H. 1Chen Y. 1Wang Z. 1Zhang C. 1Yu P. 1Zhang X. 2Zhou W. 3Liu J. 3Wang W.4
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作者信息
1. School of Chemistry and Material Science Hunan Agricultural University
2. Institute of Electrical Engineering Chinese Academy of Sciences
3. College of Material Science and Engineering Hunan University
4. Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials South China University of Technology
折叠
Abstract
? 2022 Elsevier B.V.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 μ-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.
Key words
Amorphous Si/Anode/Lithium ion battery/Mechanical milling/Raman spectroscopy
NSTL
Elsevier