The Zn metal anode is considered one of the most promising anode choices for aqueous Zn-based batteries. Nevertheless, dendrites and intricate side reactions have hindered its usage. Herein, an elastic and anti-corrosive interlayer is introduced to address the problem. The idiosyncratic dielectric behavior of amorphous and nanostructured silicon nitride (Si 3 N 4 ) is utilized to manipulate the ion kinetics, by uniformly dispersing its particles in polyacrylonitrile (PAN) to fabricate an interlayer attached to Zn metal (PSN-Zn). PAN serves as an elastic constraint to inhibit drastic dendrite evolution and blocks H 2 O/O 2 corrosion, and Si 3 N 4 with a high dielectric constant can facilitate the ion kinetics and endow uniform Zn deposition. The electrochemical stability and deposition consistency of the Zn anodes are greatly improved, with an extended lifespan of over 800 h at 1 mA cm −2 . Even under draconian deep-discharging (DOD Zn = 60%) and high current density (10 mA cm −2 ), the PSN-Zn anode can still operate stably for over 250 h. The effect of the dielectric property is systematically discussed and verified by experiments and theoretical simulations. Moreover, full cells with vanadium-and manganesebased cathodes also deliver excellent performance, indicating the use of the multifunctional interlayer as an appealing approach for rechargeable aqueous zinc batteries.

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Pea-pod structured SiOx/C nanofibers were synthesized by the electrospinning method, whose structure can be controlled by adjusting the addition amounts of organosilica-polymer nanospheres and they exhibit superior electrochemical performance.