長寿命・空気安定性に優れたO3型正極材料を先進的なナトリウムイオン電池向けに実現するデュアルインターフェース修飾

O3-type layered oxide materials are generally regarded as the most potential cathode candidates for sodium-ion batteries (SIBs) owing to their exceptional energy density and suitable initial Coulombic efficiency. However, the development of the O3-type cathode materials in practical applications is hindered by their poor cyclic and air stability. Herein, we creatively develop a dual-layer interface modification strategy for the O3 cathode (NaNi_0.45Mn_0.4Cu_0.05Ti_0.1O₂), aimed at decreasing the diffusion barrier of Na⁺ and alleviating structural deterioration during the cycle process. The optimized sample (O3@P2@NAO) exhibits a comprehensive improvement in electrochemical properties, characterized by not only high capacity (150 mAh g^-1 at 0.1C) and superior rate capability (126.6 mAh g^-1 at 5C), but also extended cycling stability (90.5% capacity retention after 120 cycles). In addition, the O3@P2@NAO cathode delivers an excellent capacity retention of 85.5% after air exposure to wet air (40% RH) for 7 days. The physicochemical structure and electrochemical tests indicate that the unique double interface modification layers provide rapid Na⁺ transport channels and slow down the corrosion effects of the electrolyte and air on the cathode surface. This work provides a feasible approach for developing O3-type cathodes with application potential and accelerating advancements toward the commercialization of SIBs.