Abstract: SnO₂-NiO porous nano-fibers were synthesized by annealing nano-fibers produced by electrospinning a solution containing polyacrylonitrile(PAN),precursors of SnO₂ and NiO.XRD,SEM,TEM,nitrogen adsorption-desorption,cyclic voltammetry(CV)and charge-discharge testing were performed to analyze their morphologies,crystal structures,pore structures and electrochemical performance.The results show the porous nano-fibers consist of tetragonal phase SnO₂ and cubic phase NiO nano-particles with a size of ~5 nm; the pore size between nano-particles is ~5 nm; the nano-fiber anodes exhibit excellent electrochemical performance with a reversible capacity of 637 mA h/g after 100 cycles at a current density of 50 mA/g without exhibiting apparent capacity fading and a reversible capacity of 505 mA·h/g at a high current density up to 800 mA/g.Their excellent electrochemical performance is attributed to their one dimensional porous structure.

Key words: porous materials, nano-fibers, metal oxides, composites, electrochemical performance