Silica Wastes to High-Performance Lithium Storage Materials: A Rational Designed Al₂O₃ Coating Assisted Magnesiothermic Process

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• 作者：Bo Li ; Rongrong Qi ; Jiantao Zai ; Feihu Du ; Chi Xue ; Ying Jin ; Chengyou Jin ; Zifeng Ma and Xuefeng Qian
• 刊名：Small
• 出版年：2016
• 出版时间：October 12, 2016
• 年：2016
• 卷：12
• 期：38
• 页码：5281-5287
• 全文大小：1499K
• ISSN：1613-6829

文摘

Si/C yolk–shell structures have been developed to deal with the major issues associated with Si anodes: the huge volume changes and the low electrical conductivity. However, the fabrication process often involves expensive starting materials and/or simultaneously generates insulated SiC, which is harmful for Si anodes. Here, silica wastes from the optical fibers industry are used as starting materials to prepare high performance Si/C materials with Si@void@C yolk–shell structure via a rational designed Al₂O₃ coating assisted magnesiothermic process. The obtained yolk–shell Si@void@C materials have a capacity of more than 1450 mA h g⁻¹ after 100 cycles at 0.4 A g⁻¹. Thanks to the easily coated and removed Al₂O₃ layer, the general formation of SiC can be avoided which is beneficial for improving the rate performances, and a capacity of ≈800 mA h g⁻¹ is still kept after 200 cycles at a high rate of 10 A g⁻¹ with a low capacity loss of 0.08% per cycle.