W6+-doped Nb2O5 as high-rate anode materials for lithium-ion batteries

Niobate pentoxides have been considered as promising anode materials of lithium-ion batteries (LIBs) on account of their intrinsic large capacities, high cycling stability and enhanced safety. However, their practical usages are limited by poor rate capabilities due to the low electrical and lithium-ion diffusion rate. In this work, W6+-doped Nb2O5 nano material with enhanced rate capacity was synthesized. W6+ doping can expand crystal lattices in the Nb2O5, improving Li+ diffusion coefficients. The production of Nb4+ due to W6+ doping results to enhance electrical conductivity. The H0.05 material (W0.05-Nb2O5) exhibits delightful rate capacity (167.1 mAh g−1 at 20 C) and prominent cyclic stability resulting from their structure stability (124.3 mAh g−1 at 5 C after 600 cycles). This novel anode material provides great promise for the construction of high-performance LIBs.