High stable post-spinel NaMn2O4 cathode of sodium ion battery†
A spinel-type NaMn2O4 based on an inventive manganese and sodium compound has been synthesized under high pressure (4.5 GPa) for use as the cathode of a sodium ion battery. It exhibits a one-step voltage profile, limited polarization and good capacity retention both at room and high temperatures. The capacity retention is 94% after 200 cycles at room temperature. The stable battery performance is due to the high barrier of structure rearrangement and suppressed Jahn–Teller distortions in this post spinel structure.