Hierarchical flower-like Ni₃V₂O₈/Co₃V₂O₈ composites as advanced anode materials for lithium-ion batteries

Abstract

Hierarchical flower-like Ni 3 V 2 O 8 /Co 3 V 2 O 8 composites were prepared by a simple one-step hydrothermal process. When employed as an anode for lithium-ion batteries (LIBs), the fabricated Ni 3 V 2 O 8 /Co 3 V 2 O 8 composites exhibited significantly improved lithium storage performances with superior discharge capacity (1142.7[Formula: see text]mAh[Formula: see text]g[Formula: see text] at 100[Formula: see text]mA[Formula: see text]g[Formula: see text]), excellent cycling stability (933.2[Formula: see text]mAh[Formula: see text]g[Formula: see text] after 600 cycles at current density of 500[Formula: see text]mA[Formula: see text]g[Formula: see text]) and remarkable rate capability (607.6[Formula: see text]mAh[Formula: see text]g[Formula: see text] even at rate of 5000[Formula: see text]mA g[Formula: see text]). The superior electrochemical properties could be attributed to the hierarchical flower-like structure and impressive synergistic interplay between Ni 3 V 2 O 8 and Co 3 V 2 O 8 , which resulted in improved electronic conductivity and stable mass transfer. This interesting hybridization strategy might open a new avenue to prepare micro/nanostructured composites for high-performance energy storage devices.