Stable and efficient Li-ion battery anodes prepared from polymer-derived silicon oxycarbide-carbon nanotube shell/core composites

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Show simple item record Bhandavat, R. Singh, Gurpreet 2013-11-07T22:49:31Z 2013-11-07T22:49:31Z 2013-11-07
dc.description.abstract We demonstrate synthesis and electrochemical performance of polymer-derived silicon oxycarbide-carbon nanotube (SiOC-CNT) composites as a stable lithium intercalation material for secondary battery applications. Composite synthesis was achieved through controlled thermal decomposition of 1,3,5,7-tetramethyl 1,3,5,7-tetravinyl cyclotetrasiloxane (TTCS) precursor on carbon nanotubes surfaces that resulted in formation of shell/core type ceramic SiOC-CNT architecture. Li-ion battery anode (prepared at a loading of~ 1.0 mg cmˉ²) showed stable charge capacity of 686 mAh gˉ¹ even after 40 cycles. The average coulombic efficiency (excluding the first cycle loss) was 99.6 %. Further, the post electrochemical imaging of the dissembled cells showed no apparent damage to the anode surface, highlighting improved chemical and mechanical stability of these composites. Similar trend was observed in the rate capability tests, where the SiOC-CNT anode (with 5 wt.% loading in TTCS) again showed stable performance, completely recovering the first cycle capacity of ~ 750 mAh gˉ¹ when the current density was brought back to 50 mA gˉ¹ after cycling at higher current densities. en_US
dc.language.iso en_US en_US
dc.relation.uri en_US
dc.rights Permission to archive granted by the Journal of Physical Chemistry C, October 19, 2013. This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in Journal of Physical Chemistry C, copyright © American Chemical Society after peer review. To access the final edited and published work see en_US
dc.subject Polymer-derived ceramic en_US
dc.subject SiOC en_US
dc.subject Coulombic efficiency en_US
dc.subject Nanotechnology en_US
dc.subject Energy storage en_US
dc.title Stable and efficient Li-ion battery anodes prepared from polymer-derived silicon oxycarbide-carbon nanotube shell/core composites en_US
dc.type Article (author version) en_US 2013 en_US
dc.citation.doi doi:10.1021/jp310733b en_US
dc.citation.epage 11905 en_US
dc.citation.issue 23 en_US
dc.citation.jtitle Journal of Physical Chemistry C en_US
dc.citation.spage 11899 en_US
dc.citation.volume 117 en_US
dc.contributor.authoreid gurpreet en_US

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