中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 22 No. 10 October 2012 |
（1. School of Materials Science and Engineering, Tongji University, Shanghai 201804, China;
2. Institute for Advanced Materials and Nano Biomedicine,
College of Medicine, Tongji University, Shanghai 200092, China）
Abstract:A facile ultrasonic method was used to synthesize CoO/graphene nanohybrids by employing Co4(CO)12 as a cobalt precursor. The nanohybrids were characterized by SEM, TEM and XPS, and the results show that CoO nanoparticles (3-5 nm) distribute uniformly on the surface of graphene. The CoO/graphene nanohybrids display high performance as an anode material for lithium-ion battery, such as high reversible lithium storage capacity (650 mA∙h/g after 50 cycles, almost twice that of commercial graphite anode), high coulombic efficiency (over 95%) and excellent cycling stability. The extraordinary performance arises from the structure of the nanohybrids: the nanosized CoO particles with high dispersity on conductive graphene substrates are beneficial for lithium-ion insertion/extraction, shortening diffusion length for lithium ions and improving conductivity, thus the lithium storage performance was improved.
Key words: lithium-ion battery; graphene; CoO; anode material; ultrasonic synthesis
