High stable post-spinel NaMn2O4 cathode of sodium ion battery

A CaFe₂O₄-type NaMn₂O₄ has been synthesized at a pressure of 4.5 Gpa, as the cathode of SIBs. It exhibits a smooth voltage profile, limited polarization and good capacity retention both at room temperature and at a higher temperature. The stable battery performance is due to the high barrier of structure rearrangement and suppressed Jahn–Teller distortions in this post-spinel structure.