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SCI Article

Sea Sand-Derived Magnesium Silicide as a Reactive Precursor for Silicon-Based Composite Electrodes o
Author Kang, Min Seok (Dept Appl Chem); Yoo, Won Cheol (Dept Appl Chem); Yoo, Won Cheol (Dept Chem & Mol Engn);
Corresponding Author Info Sung, YE (reprint author), Seoul Natl Univ, Dept Chem & Biol Engn, Ctr Nanoparticle Res, Inst Basic Sci, Seoul 151744, South Korea.; Yoo, WC (reprint author), Hanyang Univ, Dept Appl Chem, Ansan 426791, Gyeonggi Do, South Korea.; Yoo, WC (reprint author),
E-mail 메일ysung@snu.ac.kr 메일 wcyoo@hanyang.ac.kr
Document Type Article
Source ELECTROCHIMICA ACTA Volume:245 Issue: Pages:893-901 Published:2017
Times Cited 0
External Information pdfhttp://dx.doi.org/10.1016/j.electacta.2017.05.164
Abstract Recently, it has been clearly elucidated that nanostructured Si-based composites hybridized with protective and conductive materials can present enhanced electrochemical performance as anodes for Liion batteries (LIBs). One of remaining issues is to develop a sustainable and economic method to synthesize these composites on a large scale for industrial applications. Herein, we introduce a modified magnesiothermic reaction route to prepare the aforementioned Si-based composite electrodes using seasand derived Mg2Si as a reactive precursor. Owing to its reducibility and lability, Mg2Si can readily reduce group IVA oxides, such as Na2CO3, SiO2, GeO2, and SnO2, resulting in macroporous Si surrounded by the reduced forms of the counter reactants (C, Si, Ge, and Sn, respectively), some of which can be electrochemically attractive. Notably, the porous Si-based composite can be synthesized by a simple solid state reaction, so simplicity and scalability can be obtained. Also, the sea sand precursor is naturally-abundant; hence this process can be cost-effective, scalable, and sustainable. Porous Si@C composite can be synthesized from the modified magnesiothermic reaction using a sea sand-derived Mg2Si precursor, showing a specific capacity of 1000 mAh/g at 200th cycle. Potentially this process can be used for practical synthesis of Si-based composites. (C) 2017 Elsevier Ltd. All rights reserved.
Web of Science Categories Electrochemistry
Funding Hanyang University [HY-2013-N]; [IBS-R006-G1]
Language English
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