Na-ion Cathodes
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Superstructure control of first-cycle voltage hysteresis in oxygen-redox cathodes
This work shows that first-cycle voltage hysteresis in oxygen-redox cathodes is determined by the local cation superstructure in the transition-metal layers. Loss of honeycomb ordering on charge enables manganese migration and molecular O2 formation, whereas a ribbon superstructure suppresses these processes, stabilising oxygen redox and minimising hysteresis.
Delocalized electron holes on oxygen in a battery cathode
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Reversible Electron–Holes on O in P2-type Na0.67Li0.1Ni0.3Mn0.6O2
Influence of Ion Size on Structure and Redox Chemistry in Na-Rich and Li-Rich Disordered Rocksalt Battery Cathodes
This study compares the structural evolution and electrochemical behaviour of isostructural disordered rocksalt cathodes Li2MnO2F and Na2MnO2F, showing that the larger Na⁺ ion leads to lower-voltage Mn and O redox couples and a two-phase charging mechanism with significant amorphisation on charge, unlike the single-phase behaviour seen in the Li analogue.
