Synergizing phase engineering and site-selective substitution through the rational design of a high-entropy layered oxide cathode enables air-stable and long-life sodium-ion batteries

The P2/O3-Na8M cathode demonstrated exceptional stability and performance: 93.3% capacity retention after 100 cycles at 0.1C, high air/water resistance (35 days), and 281.2 Wh kg −1 in full cells, promising for advanced energy storage.