A high-rate and air-stable cathode material for sodium-ion batteries: yttrium-substituted O3-type Ni/Fe/Mn-based layered oxides

The electrochemical properties of O3-NaNi 1/3 Fe 1/3− x Mn 1/3 Y x O 2 cathode materials for sodium ion batteries are significantly improved by using yttrium substitution strategy to realize the micro-modulation of the crystal structure.