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

P2-Na_0.66Mn_0.6Li_0.1Ti_0.1(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 Na_0.66Mn_0.6Li_0.1Ti_0.1(MgAlCuZn)_0.05O_1.7F_0.3 stands out for its enhanced cycling stability and rate performance.