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Iron-mediated reversible lattice-oxygen redox enables stable 200 Wh kg<sup>−1</sup> sodium-ion batteries
Nature Energy, Published online: 20 August 2026; doi:10.1038/s41560-026-02112-8
Lattice-oxygen redox can raise the energy density of layered oxide cathodes, but poor reversibility causes structural degradation and capacity loss. Here the authors use iron as a bulk redox mediator to boost oxygen-redox reversibility and stabilize high-energy sodium-ion batteries.
