An advanced medium-entropy substituted tunnel-type Na0.44MnO2cathode for high-performance sodium-ion batteries

NMO-1 exhibits good electrochemical performance, with a capacity retention of more than 80% after 2000 cycles at a rate of 10C between 2 and 4 V. The suggested approach of medium-entropy substitution offers insight into the design of high-energy Na-ion cathode materials.