Abstract
The real-world commercial application of aqueous zinc-ion batteries (AZIBs) is retarded by the poor stability of Zn anode in aqueous solutions, resulting in annoying dendrite growth and intricate side reactions. Herein, the KI-CHOP polymer with rich hydroxyl groups is decorated on the Zn anode surface to rationally construct a solid-state ion-regulating interface. Combing with elaborate experiments and theoretical calculations, the tremendous zincophilic nucleation sites exposed on the KI-CHOP layer could homogenize the Zn2+ flux passing through the interface and decrease the desolvation barrier of hydrated Zn2+, thus speeding up deposition kinetics. Furthermore, the KI-CHOP coating could serve as a hydrogen-bond breaker to construct a lean-water interface thereby suppressing the parasitic side reactions. As expected, as-obtained KI-CHOP@Zn symmetric cells could deliver ultra-long cyclability for over 2200 h at 1.0 mA cm−2 with an area capacity of 1.0 mAh cm−2 as well as excellent reversibility of repeated plating/stripping of Zn2+. Moreover, the KI-CHOP@Zn//MnO2 full cells also exhibit exceptional long-term durability under 1.0 A g−1 for 2000 cycles and rate performance. The KI-CHOP protective layer in this work paves an inspiration for multifunctional polymer coating and takes a step towards the real-world application for AZIBs.
Published Version
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