3-Dimensional hierarchically porous ZnFe2O4/C composites with stable performance as anode materials for Li-ion batteries

3-Dimensional hierarchically porous ZnFe2O4/C composites with interconnected macropores and co-continuous hollow skeletons are facilely synthesized and used as anode materials for Li-ion batteries. The interconnected macropores impede the agglomeration of primary particles and buffer the volumetric variations, hollow mesoporous skeletons not only improve the interfacial contact area between electrode and electrolyte but also facilitate lithium ions transfer rate. Moreover, N-doped carbon layer further enhances the conductivity and mechanical strength of skeletons, as well as accelerates electron transfer during repeated discharge and charge process. The as-prepared 3-dimensional hierarchically porous ZnFe2O4/C composites possess excellent Li-ion storage properties, delivering a high reversible capacity of 972 mAh g(-1) at 200 mA g(-1) after 100 cycles and a decent specific capacity of 711 mAh g(-1) even at a large current density of 1000 mA g(-1) after 400 cycles. These values are among the highest reported for ZnFe2O4-based materials with different morphologies and nanostructures. The resultant ZnFe2O4/C composites display the potential practical application for high-performance Li-ion batteries.