Monday, February 23, 2015

Silk-regulated hierarchical hollow magnetite/carbon nanocomposite spheroids for lithium-ion battery anodes

Hierarchical olive-like structured carbon-Fe 3 O 4 nanocomposite particles composed of a hollow interior and a carbon coated surface are prepared by a facile, silk protein-assisted hydrothermal method. Silk nanofibers as templates and carbon precursors first regulate the formation of hollow Fe 2 O 3 microspheres and then they are converted into carbon by a reduction process into Fe 3 O 4 . This process significantly simplifies the fabrication and carbon coating processes to form complex hollow structures. When tested as anode materials for lithium-ion batteries, these hollow carbon-coated particles exhibit high capacity (900 mAh g −1 ), excellent cycle stability (180 cycles) and rate performance due to their unique hierarchical hollow structure and carbon coating.



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