Nature Materials, Published online: 27 April 2026; doi:10.1038/s41563-026-02567-wComplex coupled ion–electron interfacial processes are poorly understood but crucial to battery dynamics. Here an ion-localization optical nanoscopy that enables single-ion imaging at 50 nm spatial and 20-ms temporal resolution at the single-particle level is presented and used to observe metal stripping cooperativity on Zn anodes.