Ti–Sn–O composite oxides coated with N-doped carbon exhibiting enhanced lithium storage performance

Abstract

The composite oxides of TiO₂ and SnO₂ (Ti–Sn–O) were fabricated by a simple precipitation method, followed by sintering at 400 °C and coating with N-doped carbon at 550 °C using pyridine as the carbon source. The carbon-coated composite with a Ti/Sn molar ratio of 1.7 : 0.3 used as anode materials for lithium ion batteries could deliver a reversible capacity of 629 mA h g⁻¹ after cycling 300 times at a current density of 100 mA g⁻¹, and a capacity of 289 mA h g⁻¹ when cycling 300 times at 500 mA g⁻¹. The outstanding cycling performance and high-rate performance result from the uniform N-doped carbon coating around the mutually dispersed TiO₂ and SnO₂ nanoparticles.