Ce 4+ Doping to Improve the Electrochemical Performance of NaNi 0.4 Fe 0.2 Mn 0.4 O 2 Cathode Material

at 5°C. After 100 cycles at 0.5°C, the capacity retention rate was 77.6%. Notably, the cycling and rate performances of the material improved. Thus, it provides a reference for developing high-performance cathode materials for sodium-ion batteries.