Stable and Efficient Li-Ion Battery Anodes Prepared from Polymer- Derived Silicon Oxycarbide−Carbon Nanotube Shell/Core Composites

摘要: We demonstrate the 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 was achieved through controlled thermal decomposition 1,3,5,7-tetramethyl 1,3,5,7-tetravinyl cyclotetrasiloxane (TTCS) precursor on carbon nanotubes surfaces that resulted in formation shell/core type ceramic SiOC–CNT architecture. Li-ion anode (prepared at loading ∼1.0 mg cm–2) showed charge capacity 686 mA h g–1 even after 40 cycles. The average Coulombic efficiency (excluding first cycle loss) 99.6%. Further, post imaging dissembled cells no apparent damage to surface, highlighting improved chemical mechanical stability these composites. A similar trend observed rate capability tests, where (with 5 wt % TTCS) again performance, co...