Silica Wastes to High-Performance Lithium Storage Materials: A Rational Designed Al 2 O 3 Coating Assisted Magnesiothermic Process
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 ha...
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Veröffentlicht in: | Small (Weinheim an der Bergstrasse, Germany) Germany), 2016-10, Vol.12 (38), p.5281-5287 |
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Hauptverfasser: | , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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 Al
O
coating assisted magnesiothermic process. The obtained yolk-shell Si@void@C materials have a capacity of more than 1450 mA h g
after 100 cycles at 0.4 A g
. Thanks to the easily coated and removed Al
O
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
is still kept after 200 cycles at a high rate of 10 A g
with a low capacity loss of 0.08% per cycle. |
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ISSN: | 1613-6810 1613-6829 |
DOI: | 10.1002/smll.201601914 |