Abstract
In this paper, Si-based composites coated by a multi-component layer have been synthetically prepared, via a solvothermal process, mechanical ball milling, and subsequent high-temperature calcination. The multi-component surface layer consists of an amorphous SiOx/C layer with well dispersion of TiC and TiB2 nanocrystals and amorphous TiOx and B2O3. The introduction of titanium and boron species is beneficial for the improvement of mechanical stability of the coating layer and ensures the structural integrity of the electrode during cycling, consequently leading to excellent electrochemical performances. Therefore, the obtained Si-based composites exhibit much better high-rate performances and cycling stability than Si and Si/C electrodes. Si-based composites from 2.94 mmol tetrabutyl titanate deliver specific capacities of 1377, 1361, 1247, 1104, 949, 833, 669, and 526 mAh·g−1 at 0.1, 0.2, 0.5, 1.0, 2.0, 3.0, 5.0, and 8.0 A·g−1, respectively, and capacity retention of 76.7% after 500 cycles at 1 A·g−1.
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Funding
This work was supported by General projects of Chongqing Natural Science Foundation (nos. cstc2021jcyj-msxmX0777; cstc2020jcyj-msxmX0136) and the Fundamental Research Funds for the Central Universities (no. 2021CDJQY-048).
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ZL: investigation, formal analysis; SZ: methodology, validation, data curation, writing—reviewing and editing; JW: resources, investigation; XX: supervision, conceptualization; all authors reviewed the manuscript.
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Li, Z., Zhao, S., Wang, J. et al. Multi-component layer–protected Si-based composites with improved electrochemical performances as anode for Li-ion batteries. Ionics 30, 1319–1327 (2024). https://doi.org/10.1007/s11581-024-05374-y
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DOI: https://doi.org/10.1007/s11581-024-05374-y