High Conductivity and Rate Capability of NaNb₁₃O₃₃ Wadsley–Roth Phase as a Fast‐Charging Li‐Ion Anode

Abstract The synthesis and electrochemical insertion of lithium into the Wadsley–Roth NaNb 13 O 33 phase is studied. Lithium intercalation to form Li x reaches a value up x~15, between 3.0 1.0 V vs. + /Li at slow cycling rate, capacity 233 mAh g −1 . Within this voltage window, two sharp peaks one broad peak are observed in differential plots suggesting multiple two‐phase regions. High Li‐ion conductivity rate capability was demonstrated. diffusion constant about an order magnitude greater than TiNb 2 7 average 1.6 its high‐rate makes potentially useful as anode fast‐charge battery application.