Orthorhombic-phase Nb2O5(T-Nb2O5)has been widely investigated as an intercalation anode material for Li-ion batteries due to the larger interplanar lattice spacing and high safety.However,its applications are limited by the intrinsic low electric conductivity.Herein,an ultrathin N-doped carbon-coating layer was constructed on porous T-Nb2O5 microspheres uniformly via a convenient thermal treatment method with ionic liquid as a carbon precursor.The synthesized T-Nb2O5@N-C exhibits significantly enhanced rate capability(155.5 mAh·g-1 at 20C)than initial T-Nb2O5(110.2 mAh·g-1 at 20C).Besides,T-Nb2O5@N-C shows ultralong cycle life,with only a 0.02％decrease in the capacity per cycle at a high current density of 10C.The corresponding electrochemical tests show that the preferable rate capability of T-Nb2O5@N-C electrode is attributed to the increased electronic conduc-tivity and pseudocapacitance contribution induced by ultrathin surface N-doped carbon layer.On the other hand,the mesoporous structure of T-Nb2O5@N-C ensures fast Li+diffusion dynamics and electrolyte penetration.Fur-thermore,T-Nb2O5@N-C also performs well in a LiNi0.5Mn0.3Co0.2O4‖T-Nb2O5@N-C full cell.This work provides a facile method to construct integrated anode materials for potential applications in lithium-ion batteries.