Intrinsic Distortion against Jahn‐Teller Distortion: A New Paradigm for High‐Stability Na‐Ion Layered Mn‐Rich Oxide Cathodes

Abstract Layered manganese‐rich oxides (LMROs) are widely recognized as the leading cathode candidates for grid‐scale sodium‐ion batteries (SIBs) owing to their high specific capacities and cost benefits, but the notorious Jahn‐Teller (J‐T) distortion of Mn 3+ always induces severe structural degradation and consequent rapid cathode failure, impeding the practical implementation of such materials. Herein, we unveil the “intrinsic distortion against J‐T distortion” mechanism to effectively stabilize the layered frameworks of LMRO cathodes. The intrinsic distortion simply constructed by introducing bulk oxygen vacancies is systematically confirmed by advanced synchrotron X‐ray techniques, atomic‐scale imaging…

• AN
  Agence Nationale de la Recherche

  Awards: ANR-10-EQPX-45, ANR-10, ANR-10-EQPX
• NN
  National Natural Science Foundation of China

  Awards: 22103057, 22235002, 52372171, 22075016, 22075016 and 52372171
• UO
  University of Science and Technology Beijing
• NK
  National Key Research and Development Program of China

  Award: 2022YFE0109100
• BS
  Beijing Synchrotron Radiation Facility