Unlocking the Potential of P2‐Type‐Layered Oxides for High‐Performance Sodium‐Ion Batteries Through Crystal Facet Modulation and Dual Doping

Sodium‐based layered transition metal oxides (LTMO) are considered promising cathode materials for sodium‐ion batteries (SIBs) due to their high specific capacity and structural versatility. P2‐type Na 2/3 Ni 1/3 Mn 2/3 O 2 (NNMO) stands out for its three‐dimensional ion diffusion channels and a high capacity of 173 mAh/g. However, its practical application is hindered by sluggish ion kinetics, resulting in poor rate performance. To address these limitations, the present study explores a dual modification strategy involving multi‐elemental doping and facet engineering. A co‐precipitation method using ethanol as a solvent is utilized to promote the preferential growth of electrochemically active 010 facets. Magnesium (Mg 2+) and zinc (Zn 2+) ions are doped at the nickel site, leading to significant improvements in cycling stability and capacity retention. The experimental findings demonstrate that increasing the number of electrochemically active facets significantly enhances the electrochemical properties of the material. The optimized 0. 04‐Zn/Mg‐NNMO cathode retained 71. 14% of its initial capacity over 250 cycles at 1 C within a voltage range of 2. 0–4. 3 V, compared with just 29% retention for pristine NNMO. This study demonstrates an effective modification strategy to enhance the performance of P2‐type layered transition metal oxide cathodes (Na 2/3 Ni 1/3 Mn 2/3 O 2) by combining facet engineering with dual‐ion doping, offering a promising route to enhance the capacity retention in SIBs.