Core-shell SnO_2@TiO_2-B nanowires as the anode of lithium ion battery with high capacity and rate capability

摘要

Core-shell SnO_2@TiO_2-B nanowires are synthesized via a two-step hydrothermal route. SnO_2 nanopar-ticles are uniformly coated on the whole surface of TiO_2-B nanowires. As the anode of lithium ion batteries, core-shell SnO_2@TiO_2-B nanowires exhibit high lithium storage capacity and superior rate capability. The reversible capacity is ～1160 mAh g~(-1) at C/5 rate (5 h per charging cycle) and the retention is 790 mAh g~(-1) after 30 cycles. At the rate of 2C, the capacity can be maintained at 556 mAh g~(-1). Such a good lithium storage performance can be attributed to the synergistic effect between SnO_2 and TiO_2-B nanostructures.