CoNiO nanowire arrays as a high-performance anode material for lithium-ion batteries

• Published in: Journal of alloys and compounds 2014, Vol.583, p.366-371
• Main Authors: Yao, Jianyu, Xiao, Peng, Zhang, Yunhuai, Zhan, Min, Yang, Fei, Meng, Xiaoqin
• Format: Article
• Language: English
• Subjects: Anode material; Anodes; Arrays; Chemistry; Discharge; Electrochemical characterization; Electrochemistry; Electrodes: preparations and properties; Exact sciences and technology; General and physical chemistry; Lithium batteries; Lithium-ion batteries; Lithium-ion battery; Metal oxides; Nanostructure; Nanowires; Nickel; Scanning electron microscopy; Titanium dioxide
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2013.08.217

•CoNiO/TiO2NTs was synthesized by a facile hydrothermal method.•The addition of Ni to CoO could improve its conductivity.•CoNiO/TiO2NTs nanocomposite material is a 3D structure.•It delivers a high areal capacity when used as lithium-ion battery anode material. CoNiO nanowire arrays loaded on TiO2 nanotubes (CoNiO/TiO2NTs) are synthesized by a hydrothermal method and used firstly as an anode material for lithium-ion batteries. The morphology, structure and composition of the composite are characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). The EDS patterns display the atomic ratio of Co to Ni is 0.41:0.59 with accuracy of more than 99%. SEM images show that the diameters of these nanowires range from 10 to 40nm and the average length approximately 1μm. Electrochemical characterizations are performed in a three-electrode system to determine the capacity, cyclic stability and to investigate the reaction mechanism. As an anode material for lithium-ion batteries, the CoNiO/TiO2NTs nanocomposite delivers a high areal capacity of 362μAhcm−2 (1097mAhg−1, 0.33mgcm−2) after 40 discharge/charge cycles at a current density of 0.2mAcm−2 (about 606mAg−1). EIS results show that addition of Ni to the CoO could increase the conductivity of the composite significantly and improve the kinetic behavior during discharge–charge process. The present finding provides a kind of nanostructure fabrication that might be applied in supercapacitor and solar cells, etc.