Defective WO3-x/N-C Composite as an Anode Material for Lithium-ion Batteries

Abstract

Lithium-ion batteries, as an important power source, play significant roles in current daily life, while the performances highly depend on anode materials. Herein, defective WO3-x/N-C composites containing defective WO3-x nanowires and conductive N-C are successfully prepared via a two-step procedure. As shown in test results, the WO3-x/N-C composites demonstrate an encouraging capacity of 1004.3 mAhg−1 (0.1 Ag−1). After 150 cycles, a remarkable reversible capacity of 520 mAhg−1 can be retained. Furthermore, the WO3-x/N-C composites display a remarkable performance compared to WO3-x. The excellent reversible capacity and cycling stability of WO3-x/N-C composites are associated with the abundant oxygen vacancies in WO3-x/N-C nano-composites as well as the conducting carbon layer.