Highly reversible, dendrite-free and low-polarization Zn metal anodes enabled by a thin SnO 2 layer for aqueous Zn-ion batteries

Dendrite-free Zn anodes protected by a zincophilic, hydrophilic and thin (∼100 nm) SnO 2 layer exhibited an outstanding electrochemical performance over a wide range of cycling, especially for Zn plating/stripping with large current and high capacity.