Sn/SnO2@C composite nanofibers as advanced anode for lithium-ion batteries

摘要: Abstract Sn/SnO 2 @C composite nanofibers were successfully fabricated by a facile annealing strategy. The consists of an amorphous carbon matrix encapsulating nanotubes decorated ultrafine ( nanoparticles, with submicron Sn particles incorporated in the entangled networks nanofibers. When used as anode material for lithium ion batteries, exhibited high initial charge capacity 756 mAh g −1 at 100 mA g , excellent high-rate 190 mAh g 5 A g and retention 591 mAh g after 100 cycles . High-resolution transmission electron microscopy, energy dispersive spectroscopy mapping, X-ray photoelectron spectroscopy, electrochemical impedance applied to investigate origins Li + storage properties @C. It could be deduced that ductile free spaces nanofiber can effectively accommodate strain volume change during cycling, prevent aggregation pulverization particles, keep whole structure stable, facilitate transport through electrode.