Porosity Controlled TiNb2O7 Nanotubes As High Power Anode Materials for Li-Ion Batteries

Thursday, 5 October 2017: 17:40
Maryland C (Gaylord National Resort and Convention Center)


Porosity of transition metal oxides makes their unique physicochemical properties for using energy storage. However, synthesizing active materials by a simple method is still hard to develop without sacrificial templates. In this regard, we report a synthesis of hollow TiNb2O7 nanotubes through dual nozzle electrospinning as a high power anode material for LIBs. The porosity of hollow TiNb2O7 nanotube was controlled by molar ratios of acetic acid to Ti/Nb alkoxide precursors and degree of Ti/Nb metal hydroxides formation in electrospun fibers. The TiNb2O7 nanotubes have the average diameter of 260 nm and a surface area in the range of 52–151 m2g-1. Moreover, the porous nanotubes consist of micropores below 2 nm and mesopores in the range of 5–60 nm in their walls that are connected to the inner hole with a diameter of 150 nm. Particularly, the unique structure of the nanotubes shows a high discharge capacity of 294 mAh g-1, stable cycle performance of 86% capacity retention over 700 cycles, and superior rate capability of 230 mAh g-1 at high 50C. Our strategy confirmed a facile synthesis of porous TiNb2O7 nanotubes without templates and the potential to use of high power anode material for LIBs.