title: Silica Wastes to High-Performance Lithium Storage Materials: A Rational Designed Al2O3Coating Assisted Magnesiothermic Process.
abstract: 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 Al2O3coating assisted magnesiothermic process. The obtained yolk-shell Si@void@C materials have a capacity of more than 1450 mA h g-1after 100 cycles at 0.4 A g-1. Thanks to the easily coated and removed Al2O3layer, the general formation of SiC can be avoided which is beneficial for improving the rate performances, and a capacity of ≈800 mA h g-1is still kept after 200 cycles at a high rate of 10 A g-1with a low capacity loss of 0.08% per cycle.
authors.affiliation: Shanghai Electrochemical Energy Devices Research Center, School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Li
authors.affiliation: Shanghai Electrochemical Energy Devices Research Center, School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China. rrqi@sjtu.edu.cn.
authors.forename: Rongrong
authors.initials: R
authors.lastname: Qi
authors.affiliation: Shanghai Electrochemical Energy Devices Research Center, School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China. zaijiantao@sjtu.edu.cn.
authors.forename: Jiantao
authors.initials: J
authors.lastname: Zai
authors.affiliation: Shanghai Electrochemical Energy Devices Research Center, School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China.
authors.forename: Feihu
authors.initials: F
authors.lastname: Du
authors.affiliation: Jiangsu Zhongtian Technology Co., Ltd, Jiangsu, 226000, China.
authors.forename: Chi
authors.initials: C
authors.lastname: Xue
authors.affiliation: Jiangsu Zhongtian Technology Co., Ltd, Jiangsu, 226000, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Jin
authors.affiliation: Jiangsu Zhongtian Technology Co., Ltd, Jiangsu, 226000, China.
authors.forename: Chengyou
authors.initials: C
authors.lastname: Jin
authors.affiliation: Shanghai Electrochemical Energy Devices Research Center, School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China.
authors.forename: Zifeng
authors.initials: Z
authors.lastname: Ma
authors.affiliation: Shanghai Electrochemical Energy Devices Research Center, School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China. xfqian@sjtu.edu.cn.
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Qian
keywords: Si/C materials; magnesiothermic reaction; silicon anodes; yolk-shell structures