Synthesis of F-doped high-entropy layered oxide as cathode material towards high-performance Na-ion batteries

P2-Na0.66Mn0.6Li0.1Ti0.1(MgAlCuZn)0.05O2 is a potential high-entropy cathode for sodium-ion batteries, showing high initial reversible capacity of 245.56 mA h g-1 at 0.05C. Despite this, it still faces deficiencies in cycle and rate performance. Our experimental and theoretical findings indicate that strategic F doping can substantially improve the crystal stability and Na+ transport dynamics. Notably, the Na0.66Mn0.6Li0.1Ti0.1(MgAlCuZn)0.05O1.7F0.3 stands out for its enhanced cycling stability and rate performance.