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Novel 3D Si/C/SiOC nanocomposites: Toward electrochemically stable lithium storage in silicon

Vrankovic, D. and Wissel, K. and Graczyk-Zajac, M. and Riedel, R. (2017):
Novel 3D Si/C/SiOC nanocomposites: Toward electrochemically stable lithium storage in silicon.
In: Solid State Ionics, Elsevier, pp. 66-71, 302, ISSN 01672738,
[Online-Edition: http://doi.org/10.1016/j.ssi.2016.11.009],
[Article]

Abstract

In this work, we present an easy and environmentally friendly approach to stabilize nanostructured, porous crystalline (Sitc) and amorphous (Sisa) silicon synthesized via magnesiothermic reduction. As matrix, fructose-derived carbon, polymer-derived SiOC ceramic or both, carbon and SiOC, are used. By means of X-ray diffraction and Raman spectroscopy it is found that the crystallinity of Sitc as well as the amorphous character of Sisa is preserved in the final composites. Embedding of crystalline silicon into carbon leads to high initial capacities of ~ 600–650 mAh·g− 1, but only the matrix consisting of carbon and SiOC results in a stable cycling behaviour over 50 cycles with a final capacity of 575 mAh·g− 1. All composites derived from amorphous Sisa show a stable cycling behaviour; the highest, stable capacity of ~ 500 mAh·g− 1 is observed when silicon is covered with carbon and SiOC.

Item Type: Article
Erschienen: 2017
Creators: Vrankovic, D. and Wissel, K. and Graczyk-Zajac, M. and Riedel, R.
Title: Novel 3D Si/C/SiOC nanocomposites: Toward electrochemically stable lithium storage in silicon
Language: English
Abstract:

In this work, we present an easy and environmentally friendly approach to stabilize nanostructured, porous crystalline (Sitc) and amorphous (Sisa) silicon synthesized via magnesiothermic reduction. As matrix, fructose-derived carbon, polymer-derived SiOC ceramic or both, carbon and SiOC, are used. By means of X-ray diffraction and Raman spectroscopy it is found that the crystallinity of Sitc as well as the amorphous character of Sisa is preserved in the final composites. Embedding of crystalline silicon into carbon leads to high initial capacities of ~ 600–650 mAh·g− 1, but only the matrix consisting of carbon and SiOC results in a stable cycling behaviour over 50 cycles with a final capacity of 575 mAh·g− 1. All composites derived from amorphous Sisa show a stable cycling behaviour; the highest, stable capacity of ~ 500 mAh·g− 1 is observed when silicon is covered with carbon and SiOC.

Journal or Publication Title: Solid State Ionics
Volume: 302
Publisher: Elsevier
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 17 Mar 2017 09:22
Official URL: http://doi.org/10.1016/j.ssi.2016.11.009
Identification Number: doi:10.1016/j.ssi.2016.11.009
Funders: We gratefully acknowledge the financial support of the German Research Foundation (DFG) SPP1473/JP8.
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