Co3O4多孔纳米带的无模板法制备及其增强的锂离子电池性能研究.docVIP

  Template-free fabrication of Co3O4 porous nanobelts from nanorods and their enhanced lithium-ion battery  5 10 15 20 25 30 35 40 performance# XING Lili, CHEN Zhaohui, XUE Xinyu** (College of Sciences, Northeastern University, ShenYang 110004) Abstract: Co3O4 porous nanobelts are fabricated from nanorods by a template-free hydrothermal method. Enhanced lithium-ion battery performance is obtained from Co3O4 porous nanobelts. The reversible capacity is up to 1388 mAh/g, the initial coulomb efficiency is 84.7 %, and the cyclability is excellent. Lithium-ion battery performance of porous nanobelts is much higher than that of nanorods. Such a behavior is attributed to more efficient Li insertion, less volume change and no agglomeration of porous nanobelts. The present results open a way for fabrication of porous 1D nanostructures and imply that porous 1D nanostructures are good candidates for high performance lithium-ion battery anodes. Keywords: Nanomaterials; Cobalt oxide; Lithium-ion battery; Anode 0 Introduction Rechargeable lithium-ion batteries (LIBs), for their high energy density, lightweight, long service life and absence of memory effects, have attracted great attention in fields of portable electronic devices and electric vehicles [1-3]. In recent years, many efforts have been taken to search for high performance anode materials, such as transition-metal oxides (NiO, Co3O4 and Fe2O3) [4-7]. Among them, Co3O4 has the highest theoretical specific capacity (~892 mAh/g) [5,6]. However, cycling properties of bulk Co3O4 materials are unsatisfied and the capacity usually fades to 250 mAh/g after several tens of discharge/charge cycles [8]. Their volume change is very serious during lithium insertion and extraction, which result in the pulverization of the materials. Nowadays, one-dimensional (1D) nanostructures have been reported to have higher lithium storage performance than bulk materials because 1D nanostructures have higher total surface energy and can acc