Electrochemical Activation Inducing Rocksalt‐to‐Spinel Transformation for Prolonged Service Life of LiMn 2 O 4 Cathodes

rocksalt layer on the surface of degraded cathodes back into active spinel. This transformation is confirmed through electron microscopy and corroborated by density functional theory simulations. Moreover, the viability of this electrochemical activation strategy has been demonstrated in pouch cell configurations with Li metal as the anode, underscoring its potential for broader application.