Strong Lewis-acid coordinated PEO electrolyte achieves 4.8 V-class all-solid-state batteries over 580 Wh kg^-1.

1e ) demonstrates that, at high potential (4.5–4.8 V), high valence Ni is reduced to a low valence state during the oxidation of PEO, although the Ni valence of the whole cathode particle showed an increasing trend (Fig. 1f ).

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