Excellent cycling stabilities of a novel calliandra-like Co_3O_4 acted as anode materials for the lithium-ion battery

摘要

Herein, a hierarchical calliandra-like Co3O4is successfully synthesized via a simple carbon sphere and hydroxypropyl cellulose assisted hydrothermal process. X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) characteristics results indicate that the hierarchical Co3O4spheres are 3–6 μm in diameter and belong to spinel structure. Each Co3O4sphere is consisted of radially oriented nanocystals accumulated nanorods building blocks. The formation mechanism for this structure maybe ascribed to the collaboration effect of carbon sphere and hydroxypropyl cellulose, which act as hard template and dispersion stabilizer respectively. The calliandra-like Co3O4particles exhibit satisfied electrochemical performance with high specific capacities and good rate capabilities, especially superior cycling stability when used as anode active materials in the lithium-ion batteries, which release an initial discharge capacity of 1139.42 mA h g−1at 200 mA g−1, and maintain a reversible capacity of 734.64 mA h g−1after 500 cycles.