Ta-doped Nb 2 O 5 with enhanced performance for lithium-ion batteries

, both markedly higher than those of the undoped counterpart. Through structural and electrochemical characterization studies, we identify that Ta doping improves lattice stability, facilitates charge transfer and thus contributes to performance improvement at high current densities during long-term cycling tests. Our work exemplifies a new strategy for improving the performance of Nb-based anodes and can be widely extended to the design of other high-performance electrode materials.