Direct synthesis of carbon-doped TiO2 bronze nanostructures as anode materials for high performance lithium batteries

摘要

Carbon doped TiO ₂ bronze nanostructures, preferably nanowires, were synthesized via an easy doping mechanism and utilized as an active material for Li-ion batteries. Both the wire shape and the presence of carbon doping contribute to the high electrochemical properties of these materials. For example, direct carbon doping shortens the lithium ion diffusion distance and improves the electrical conductivity of the wire as cycle experiments show. Direct carbon doping has been shown by cycling experiments to have a significantly higher capacity and superior rate capability than undoped nanowires. When the prepared carbon-doped nanowire was evaluated with a lithium half-cell, it showed a lithium storage capacity of about 306 mAhg ⁻¹ (91% of theoretical capacity) at a current rate of 0.1 C, and even at a current rate of 10 C after 1000 cycles of charge and discharge. An excellent discharge capacity of about 160 mAhg ⁻¹ was exhibited.