The production and electrochemical performance analysis of an O3-NaTi 0.2 Mn 0.2 Fe 0.2 Ni 0.2 Co 0.2 O 2 high-entropy oxide cathode for Na-ion batteries

A five-cation high-entropy layered oxide suppresses degradative phase transitions, delivering ∼120 mA h g −1 at C/3 with improved structural robustness.