Entropy-Tailored Fast-Charging Sodium Layered Cathodes

O3-type layered transition metal (TM) oxides are widely used as cathode materials for Na-ion batteries due to their high energy density potential, enabled by the state of charge (SoC)-dependent transition from octahedral (O-type) to prismatic (P-type) structures during Na-ion (de)sodiation. However, the O–P transition is often criticized for compromising the Na-ion mobility and limiting the cycle life. Herein, we reveal the intrinsic correlation between O–P transitions, oxygen behaviors, and Na-ion kinetics. We demonstrate that a compositionally versatile, entropy-tailored approach can promote preferred transitions (characterized by large lattice parameter deviations in the O-type region and rapid O–P biphasic…

• NN
  National Natural Science Foundation of China

  Awards: 52325405, U21A20284, 52261135632
• CP
  China Postdoctoral Science Foundation

  Award: GZC20242032
• FR
  Fundamental Research Funds for Central Universities of the Central South University

  Award: 2023XQLH069
• VT
  Vehicle Technologies Office