Wintersweet‐Flower‐Like CoFe 2 O 4 /MWCNTs Hybrid Material for High‐Capacity Reversible Lithium Storage

CoFe 2 O 4 /multiwalled carbon nanotubes (MWCNTs) hybrid materials were synthesized by a hydrothermal method. Field emission scanning electron microscopy and transmission electron microscopy analysis confirmed the morphology of the as‐prepared hybrid material resembling wintersweet flower “buds on branches”, in which CoFe 2 O 4 nanoclusters, consisting of nanocrystals with a size of 5–10 nm, are anchored along carbon nanotubes . When applied as an anode material in lithium ion batteries, the CoFe 2 O 4 /MWCNTs hybrid material exhibited a high performance for reversible lithium storage. In particular, the hybrid anode material delivered reversible lithium storage capacities of 809, 765, 539, and 359 mA h g −1 at current densities of 180, 450, 900, and 1800 mA g −1 , respectively. The superior performance of CoFe 2 O 4 /MWCNTs hybrid materials could be ascribed to the synergistic pinning effect of the wintersweet‐flower‐like nanoarchitecture. This strategy could also be applied to synthesize other metal oxide/CNTs hybrid materials as high‐capacity anode materials for lithium ion batteries.