pseudocapacitive behavior of nb2o5-tnts nanocomposite for lithium-ion micro-batteries

The present study aims to introduce niobium pentoxide-titanium nanotube (nb2o5-tnts) composite as a novel anode material synthesized through hydrothermal method. in this respect, nb2o5 nanoparticles and tnts are separately synthesized through sonochemical and anodizing processes, respectively. according to fesem images, the well-oriented tnts with inner and outer diameters of 70 and 88 nm, respectively, are well decorated by nb2o5 nanoparticles. the nb2o5-tnts anode shows the areal charge and discharge capacities of 0.167 mah/cm2 and 0.146 mah/cm2, respectively, at 0.113 ma/cm2 as well as 60% capacitive storage in 20 mv/s. high power nb2o5-tnt anode reveals 86% reversible capacity in the 16th cycle with a columbic efficiency of 84% for the 16th cycle. in addition, the charge transfer resistance in tnts declines from 750 ω to 680 ω after decorating by nb2o5. the superior performance of nb2o5-tnt composites is taken into account to derive higher charge storage from a capacitive charge storage which is dominant in the diffusion-controlled process. therefore, nb2o5-tnt composite can be applied to the next-generation pseudocapacitive anode in lithium-ion batteries