Bamboo-like amorphous carbon nanotubes clad in ultrathin nickel oxide nanosheets for lithium-ion battery electrodes with long cycle life

• Published in: Carbon (New York) 2015-04, Vol.84, p.491-499
• Main Authors: Xu, Xin, Tan, Hui, Xi, Kai, Ding, Shujiang, Yu, Demei, Cheng, Shaodong, Yang, Guang, Peng, Xiaoyu, Fakeeh, Amir, Kumar, R. Vasant
• Format: Article
• Language: English
• Subjects: Backbone; Carbon; Carbon nanotubes; Cladding; Density; Discharge; Electrodes; Lithium-ion batteries; Nanostructure
• ISSN: 0008-6223; 1873-3891
• DOI: 10.1016/j.carbon.2014.12.040

In this work, we report the synthesis of one-dimensional (1-D) hierarchical NiO nanosheets covering bamboo-like amorphous CNT composites (NiO@CNT) via a facile and a low-cost solution route based on sulfonated polymeric nanotubes (PNTs) used simultaneously as both, a template, and a source of nano-structured carbon derived by a low-temperature thermal carbonization treatment. The electrochemical performance of the NiO@CNT composite electrode indicate that this novel hybrid nanostructure is potentially capable of delivering excellent reversible capacity when used as an anode material in a lithium-ion battery (LIB). A large discharge capacity of 1034mAhg−1 is delivered by the NiO@CNT composite even after 300 cycles at a relatively high current density of 800mAg−1, with an average coulombic efficiency of 98.1%. A significant achievement in the reversible capacity of the NiO@CNT composite is attributed to the outstanding nanostructure resulting in synergistic effects of the hollow amorphous CNT backbone and ultrathin NiO nanosheets. Furthermore, the generic solution method to fabricate 1-D metal oxides@amorphous CNT nanostructures, developed in this work, is expected to have a wide range of applications in improving the properties of transition metal oxides.