Mo doping V0.76Mn0.032Ni0.029O2 vanadium based ternary metal oxides as cathode active materials for lithium-ion hybrid supercapacitor with high lithium storage performance

Lithium-ion hybrid supercapacitors as high-performance energy storage devices are proposed to bridge the electrochemical performances between lithium-ion batteries and supercapacitors. In this paper a novel Mo doping V0.76Mn0.032Ni0.029O2 vanadium based ternary metal oxide is constructed as cathode active material for lithium-ion hybrid supercapacitor. Structural analysis demonstrates Mo doping as interlayer support can ameliorate the V0.76Mn0.032Ni0.029O2 crystal structure and raise the lattice size thus providing more adequate mass transfer channels for lithium-ion storage. In addition, 5 % Mo doping V0.76Mn0.032Ni0.029O2 represents relatively regular crystal particle arrangement with some integrated crystalline form and closely packing together. These structural features enable them to exhibit higher lithium storage performance and when as cathode active material for lithium-ion hybrid supercapacitor, it exhibits the lowest electrochemical and concentration polarization and the highest discharge specific capacities of 150.7, 140.2, 125.4 and 102.5 mAh.g−1 at different current densities along with a high capacity retention rate of 77.3 % at 1000 mA g−1 current density after 2000 cycles.