A new cathode material Na2V6O16•xH2O nanowire for lithium ion battery

Single crystalline Na2V6O16 center dot 2.36H(2)O nanowires are synthesized by a facile hydrothermal method as a new cathode material for Li-ion battery. The nanowires show a diameter of 60-100 nm and a length of up to 5 mu m. Appropriate thermal treatment could effectively improve the cycling performance, although the discharge capacity is sacrificed to some extent. Na2V6O16 center dot 0.86H(2)O after heat treatment under 300 C delivers an initial specific discharge capacity 01 235.2 mAh g(-1) at 30 mAg(-1), with a capacity retention of 91.1% after 30 cycles. Long cycling test is demonstrated by the retention of 90.4% and 94.4% at 150 and 300 mAg(-1), respectively, after 80 cycles. Good rate capability is also achieved for this material. It is proposed that the improved cycling stability of the electrode after thermal treatment is mainly attributed to the removal of a part of crystal water, accompanied with certain structural arrangement. (C) 2011 Elsevier B.V. All rights reserved.