Multivalent Cations Substitution Accelerate Li‐Ion Diffusion in Na4Cr2Nb98O250 Defect Phase for Wide Temperature Energy Storage

Abstract Niobate materials are regarded as promising anode materials for Lithium‐ion batteries. Inspired by the design of shear‐type ReO 3 materials through the multivalent cations substitution defect construction method, nonequivalent Na 4 M 2 Nb 98 O 250 (M = Fe, Cr, NFNO, NCNO) anode materials are synthesized. The novel NCNO material exhibits a modified N‐Nb 2 O 5 isostructural defect phase that can optimize 3D Li‐ion transport channels and enhance the electronic conductivity, leading to a superior ionic diffusion coefficient ( D Li ) and good structural stability. It shows balanced high performance with respect to specific capacity, rate capacity and cyclability. Furthermore, it also demonstrates outstanding wide‐temperature (−10 to 45 °C) lithiation performance, especially at low temperature (−10 °C) of a capacity exceeding 100 mAh g −1 at 5C and minimal capacity decay (0.012% per cycle) after 1000 cycles, indicating the great potential of wide temperature energy storage.