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Reversible three‐electron redox of Cr3+/Cr6+ in layered cathode materials for rechargeable batteries is very attractive in layered cathode materials, which leads to high capacity and energy density for rechargeable batteries. However, the poor reversibility and Cr‐ion migration make it very challenging. In this work, by introducing V ions into tetrahedral sites of layer‐structured NaCrO2, reversible...
Stacking order plays a key role in defining the electrochemical behavior and structural stability of layer‐structured cathode materials. However, the detailed effects of stacking order on anionic redox in layer‐structured cathode materials have not been investigated specifically and are still unrevealed. Herein, two layered cathodes with the same chemical formula but different stacking orders: P2‐Na...
Anionic redox has been considered as a promising strategy to break the capacity limitation of cathode materials that solely relies on the intrinsic cationic redox in secondary batteries. Vacancy, as a kind of defect, can be introduced into transition metal layer to trigger oxygen redox, thus enhancing the energy density of layer‐structured cathode materials for sodium‐ion batteries. Herein, the formation...
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