SnO_2-NiO多孔纳米纤维负极材料的电化学性能

Electrochemical performance of SnO_2-NiO porous nano-fiber anode materials

通过静电纺丝包含聚丙烯腈(PAN)、SnO_2和NiO前驱体的溶液及其随后的煅烧过程制备出SnO_2-NiO多孔纳米纤维.使用XRD、SEM、TEM、氮气吸附脱附、循环伏安测试以及充放电测试对制备的多孔纳米纤维的形貌、晶体结构、孔结构以及电化学性能进行测试,结果表明:多孔纳米纤维由四方相SnO_2和立方相NiO纳米粒子构成,纳米粒子的尺寸为~5nm,纳米粒子之间孔隙为~5nm;SnO_2-NiO多孔纳米纤维具有良好的电化学性能,在50mA/g的电流密度下循环100圈后,其可逆容量保持在637mA·h/g,未出现明显的容量衰减现象,电流密度提高至800mA/g,其可逆容量仍有505mA·h/g,其良好的电化学性能是因为其具有多孔的一维纳米结构.

SnO_2-NiO porous nano-fibers were synthesized by annealing nano-fibers produced by electrospinning a solution containing polyacrylonitrile(PAN),precursors of SnO_2 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 SnO_2 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 of505 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.