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Magnesium Vapor Reduction of Structured Silica for Lithium Ion Battery Applications

Published online by Cambridge University Press:  12 March 2014

Rob Cook
Affiliation:
Zyvex Technologies, Rapid City, SD 57701, U.S.A.
Matthew Schrandt
Affiliation:
Materials Engineering and Science Program, South Dakota School of Mines and Technology, Rapid City, SD 57701, U.S.A.
Praveen Kolla
Affiliation:
Materials Engineering and Science Program, South Dakota School of Mines and Technology, Rapid City, SD 57701, U.S.A.
Wendell Rhine
Affiliation:
Aspen Aerogels, Northborough, MA 01532, U.S.A.
Ranjit Koodali
Affiliation:
University of South Dakota, Vermillion, SD 57069, U.S.A.
Alevtina Smirnova
Affiliation:
Materials Engineering and Science Program, South Dakota School of Mines and Technology, Rapid City, SD 57701, U.S.A. Department of Chemistry and Applied Biological Sciences, South Dakota School of Mines and Technology, Rapid City, SD 57701, U.S.A.
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Abstract

Three types of silica materials with different morphology, specifically SiO2 hollow microspheres, mesoporous silica, and silica aerogel were tested as potential precursors for synthesis of silicon nano- and meso-structures that resemble the original morphology of the precursors. In the optimized magnesium thermal reduction process, magnesium vapor was delivered to silica surface through a stainless steel mesh placed on top of a zirconia boat filled with silica precursor. This approach allowed for better control of silicon nanostructure formation by minimizing reaction by-products that can affect performance of lithium ion battery anode. Material morphological properties of the reduced silica precursors are discussed in terms of X-ray diffraction, BET, BJH pore size distribution, Raman spectroscopy, and TGA.

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Copyright
Copyright © Materials Research Society 2014 

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