Synergistic anionic-redox and solid‑solution design stabilizes O3‑type sodium layered cathodes at 4.3 V (IMAGE)

Science China Press

Synergistic anionic-redox and solid‑solution design stabilizes O3‑type sodium layered cathodes at 4.3 V

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Reversible anionic-redox and solid-solution chemistry are proposed to address the high-voltage structural instability in practical O3-type sodium layered oxide cathodes. The detrimental P3→O1 phase transition above 4.1 V is completely eliminated, achieving near-zero lattice strain. The as-prepared material exhibits superior electrochemical reversibility at a high voltage of 4.3 V, excellent rate capability, and robust air stability.

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