Charge Tuning and Anchor Effect Achieving Stable High‐Voltage Layered Metal Oxides for Sodium‐Ion Battery

Abstract Layered metal oxides (LMOs) that can stably operate at high voltage are vital to developing high‐energy sodium‐ion batteries (SIBs). However, the irreversible oxygen redox reaction of LMOs at the high voltage region (i.e., >4.0 V vs. Na + /Na) will cause serious oxygen evolution and structural instability, and therefore sharp capacity fading. Herein, we report the charge tuning and anchor effect of La doping to enhance the cycling stability of layered NaNi 1/3 Fe 1/3 Mn 1/3 O 2 (NFM) under extreme conditions (e.g., high voltage and temperature). The La doping introduces additional negative charges to the oxygen ligands of transition metals (TM) and facilitates charge transfer, thereby reducing…

• NN
  National Natural Science Foundation of China

  Awards: 52401187, 22178094, 22272205
• NS
  Natural Science Foundation of Chongqing

  Award: CSTB2024NSCQ‐MSX0505