Abstract
Vanadium dioxide (VO2) material has been deemed as a potential anode candidate for aqueous lithium-ion batteries. Among its diversified polymorphs, the latest discovered VO2 (D) receives the fewest reports on its application in energy storage. Herein, we successfully utilized a template-free solvothermal method to prepare VO2 (D) submicron-spherical hierarchical structures, constructed with colibacillus-like nanorods. The VO2 (D) submicron-spheres were applied as an active anode material into the aqueous lithium-ion battery, which exhibited suitable working potential. Furthermore, VO2 (D)-based full cell with LiMn2O4 as the cathode demonstrated high discharge capacity, good rate capability, and excellent cycling stability. The structural evolution, valence states of the VO2 (D) electrode, and impedance variation of the full cell during cycling were investigated. The work reveals the potential of VO2 (D) as a novel anode material for aqueous lithium-ion batteries.
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