Alleviated Mn2+ dissolution drives long-term cycling stability in ultrafine Mn3O4/PPy core–shell nanodots for zinc-ion batteries

An ultrafine Mn 3 O 4 /polypyrrole core–shell cathode displays superior cycling stability for aqueous zinc-ion batteries owing to the improved electron/ion conductivity, alleviated Mn 2+ dissolution and enhanced structural stability after PPy coating.