皮芯型静电纺丝制备多孔C/Ni复合纳米纤维

Preparation of C/Ni composite nanofibers with pores by core-sheath electrospinning

利用皮芯型静电纺丝法制备聚丙烯腈（PAN）/乙酸镍/聚乙烯吡咯烷酮（PVP）复合纳米纤维,再经预氧化、碳化过程制备具有多孔结构的复合纳米纤维.通过X射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）及透射电子显微镜（TEM）对纤维结构、形貌进行表征.结果表明：纤维表面具有明显的多孔结构,金属镍为立方晶,粒径大小在20~90 nm之间.在50 mA/g的电流密度下对其电化学循环性能进行测试,多孔复合纳米纤维首次放电容量达605 mAh/g,第20次循环可逆容量为435 mAh/g,充放电效率为97.4%.

PAN/Nickel acetate/PVP composite nanofibers were prepared by core-sheath electrospinning,then C/Ni composite nanofibers with pores,as anode material for Li-ion battery,were pre-oxidation and high temperature carbonation.XRD,FE-SEM and TEM were used to investigate structures and morphology of composite nanofibers,and the results showed that the fiber surface had obvious porous structure,metal nickel was cubic crystalline,and the range of metal nickel mainly was 20-90 nm.The cycling performance was tested in the current density of 50 mA/g,and the first charge capacity of porous composite nanofbiers was 605 mAh/g,the reversible specific capacity was 435 mAh/g at the 20th cycle,and the charge-discharge efficiency was 97.44%.