Construction of oriented-rod structure Ni, Mn co-doped vanadium oxide ternary materials synthesized by a facile coprecipitation method as high-performance cathode active material for lithium-ion capacitive-batteries

A novel oriented-rod structure Ni, Mn co-doped vanadium oxide ternary material synthesized via a facile coprecipitation method is constructed and used as cathode active material for lithium-ion capacitive-batteries. It indicates that vanadium oxide ternary materials with Ni, Mn co-doping ratio to 8:0.5:0.5 possess a high crystallinity and rod-shaped morphological characteristics along with a certain orientation at (110) crystal plane. This oriented-rod structure is more beneficial to the lithium-ion transmission, so as to improve the electrochemical performances as ideal cathode active materials for lithium-ion capacitive-batteries. Consequently, this oriented-rod structure Ni, Mn co-doped vanadium oxide ternary material has very excellent electrochemical reversibility, low charge transfer resistance (106 Ω), and large lithium-ion diffusion efficiency (3.16 × 10 −13 cm 2 ·s −1 ). And the initial discharge specific capacity can achieve to 124 mAh·g −1 and maintain 55.6% capacity retention rate after 1000 cycles at 100 mA·g −1 current density. Graphical Abstract In this work, we construct a novel oriented-rod structure Ni, Mn co-doped vanadium oxide ternary material synthesized via a facile coprecipitation as cathode active material for lithium-ion capacitive-batteries. This oriented-rod structure can be more beneficial to improve the electrochemical performances, including an excellent electrochemical reversibility, low charge transfer resistance, large lithium-ion diffusion efficiency, and high initial discharge specific capacity and capacity retention rate.