Abstract
In this work, silicon (Si) particles were successfully transformed to core–shell structured Si@SiOx (0 < x ≤ 2) particles via wet oxidation under high-pressure conditions. In order to obtain Si particles with different oxygen content, the SiOx-shell was generated in a sealed Teflon-lined autoclave at 150 °C for different time. As a result, the Si@SiOx particles sample with oxygen mass fraction of 2.37% (Si@SiOx-2.37%) presents the best cycling stability. The discharge specific capacity of the Si@SiOx-2.37% sample is up to 1701 mAh g−1 after 100 cycles at 0.1 C (1 C = 4.2 A g−1), which is 1068 mAh g−1 higher than that of the original Si particles sample with natural oxygen mass fraction of 0.98% (Si@SiOx-0.98%). Besides, the Si@SiOx-2.37% sample presents slightly better rate performance than others. The discharge specific capacity of the Si@SiOx-2.37% sample is 713 mAh g−1 at 2 C, but that of the Si@SiOx-0.98% sample is close to 0. As the rate is restored to 0.1 C, the Si@SiOx-2.37% sample exhibits faster recovery of capacity than others. Furthermore, when the oxygen content continues to rise, the rate and cycle performance gradually deteriorate.
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Acknowledgements
This work is supported by a Project Funded by China Postdoctoral Science Foundation (2016M592115), a Project Funded by Jiangxi Postdoctoral Foundation (2015KY12) and a Project Funded by Nanchang University (CX2018008).
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Kong, K., Xu, G., Jin, C. et al. Low-cost SiOx-coated Si particles prepared via wet oxidation as anode materials for lithium-ion batteries with excellent cycling stability. Appl. Phys. A 125, 444 (2019). https://doi.org/10.1007/s00339-019-2730-6
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DOI: https://doi.org/10.1007/s00339-019-2730-6