Al-doped VO₂(B) nanobelts as cathode material with enhanced electrochemical properties for lithium-ion batteries

Abstract

Aluminium has shown its superiority in stabilization of the monoclinic VO 2 (B) in free-standing nanobelts. In this paper, aluminium-doped VO 2 (B) nanobelts are successfully fabricated by a facile one-step hydrothermal method and used as cathode for lithium-ion battery. XPS results show that Al-doping promotes the formation of high valence state of vanadium in VO 2 (B) nanobelts. Due to the accommodation of valence state of vanadium and lattice volume, Al-doped VO 2 (B) nanobelts used as the cathode material for lithium-ion batteries exhibit better lithium storage properties with high capacity of 172[Formula: see text]mAh[Formula: see text]g[Formula: see text] and cycling stability than undoped VO 2 (B) nanobelts. This work demonstrates that the doping of aluminium can significantly enhance the electrochemical performance of VO 2 (B), suggesting that appropriate cationic doping is an efficient path to improve the electrochemical performance of electrode materials.