Carbon-encapsulated CoFe_2O_4/graphene nanocomposite as high performance anode for lithium ion batteries

摘要

Carbon-encapsulated CoFe_2O_4/graphene (C@CFO/G) nanocomposite was prepared by a facile hydrothermal strategy and subsequently in situ pyrolysis process. The small-size CoFe_2O_4 nanoparticles encapsulated within thin carbon shells anchor onto G nanosheets with crumpled and waved structure for C@CFO/G nanocomposite. The as-synthesized nanocomposite delivers high reversible capacity of 925.6 mAh g~(-1) at 100 mA g~(-1) after 50 cycles. It exhibits rate capability of 772.3,430.6 and 305.3 mA hg~(-1), even at 200, 800 and 1600 mA g~(-1), respectively, indicating outstanding rate capability and cycle stability. The improved electrochemical performance is ascribed to the well-designed structure with carbon shells and two dimension G nanosheets. The C@CFO/G nanocomposite will be an ideal candidate of anode material for lithium ion batteries.