Oxygen Vacancy Tungsten Oxide (WO3-x) as Anode Material for Rechargeable Lithium-Ion Battery

摘要

Two of the most important challenges in tungsten oxide as anode material for rechargeable lithium-ion battery are low rate performance and huge volume change during the electrochemical reaction, resulting in low cycle life. Here, oxygen vacancy tungsten oxide (WO3-x) is successfully synthesized via a hydrothermal method and used as anode material for non-aqueous lithium-ion battery. Structural and morphological characterizations of the anode confirmed that W03-x consisted of uniform nanorod particles with a diameter of 100-300 nm and length of micrometer, representing high crystallinity. It shows excellent electrochemical performances especially high capacity retention and good rate performance. This work shows that oxygen vacancies of WO3-x nanorods can greatly enhance electrical conductivity. As a result, electrochemical properties of tungsten oxide can be significantly improved to use in high-performance lithium-ion battery.