Synergizing Covalent-Ionic Tri-Site Coordination in P2-type Na<sub>0.67</sub>Fe<sub>0.33</sub>Mn<sub>0.67</sub>O<sub>2</sub> Induces Suppressed Layer-Slipping and Stablized Lattice Oxygen for Sodium-Ion Batteries at Wide Potential.
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ABSTRACT: Improving the stability of the oxygen framework and suppressing irreversible interlayer slip remain long-standing challenges for Fe/Mn-based layered oxide cathodes. Herein, a trans-sublattice three-site co-substitution strategy is proposed and implemented in Na0.67Fe0.08Cu0.25Mn0.62Mg0.05O1.95F0.05 (NFCMMOF) to precisely regulate the covalent-ionic bonding balance within both cationic and anionic sublattices. This rational lattice design simultaneously mitigates the detrimental P2-O2 phase transition and Jahn-Teller distortion, constructs highly robust TM-O/F bonds, markedly reinforces the overall oxygen framework, and establishes a highly reversible Fe3+/Fe4+-dominated charge compensation me
SUBMITTER: Xue H
PROVIDER: S-EPMC13387034 | biostudies-literature | 2026 Oct
REPOSITORIES: biostudies-literature
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