3D network-structured CoSb/P-CNFs@rGO as a highly conductive self-supporting anode material for lithium-ion batteries

Abstract

CoSb particles have an extremely high specific capacity as anodes for Li-ion batteries, but the severe expansion during the reaction process makes their cycle stability very poor. In this study, a 3D CoSb/P-CNFs@rGO network structure has been successfully constructed by a simple electrospinning technique and hydrothermal treatment. 1D carbon nanofibers and 2D reduced graphene oxide network are intertwined and coated to create this 3D structure. In this ingenious strategy, CoSb particles are embedded in carbon nanofibers to restrain volume expansion. By encapsulating the nanoparticles in a graphene structural network, it is possible to stabilize the matrix structure and precipitate CoSb particles for secondary capture. In addition, the 3D network structure also builds a fast channel for 3D interaction electron/ion transfer. Benefiting from the above structural advantages, the CoSb/P-CNFs@rGO flexible self-supporting anode exhibits excellent electrochemical performance, including ultra-long cycling performance (870 mA h g−1 after 2000 cycles at a current density of 500 mA g−1). More importantly, the 3D structure design method may provide a simple and effective strategy to overcome the volume expansion of anode materials.