Zinc anodes suffer from problems such as dendrite formation, corrosion, hydrogen evolution, and surface passivation, hindering the development of aqueous zinc batteries. In response, Xingbo Liu et al. at West Virginia University constructed a thin polyvinyl alcohol (PVA) coating on the zinc anode, effectively regulating interfacial ion diffusion and inducing preferential crystallization along the Zn(002) plane. This resulted in uniform nucleation and deposition of metallic Zn, achieving a dendrite-free, long-life aqueous zinc battery. The PVA@Zn anode achieved an ultra-long cycle life of thousands of hours at current densities of 0.25 and 1 mA cm⁻². It also exhibited excellent durability and battery life at a deep cycling capability of 5 mA h cm⁻² and a high current density of 10 mA cm⁻². The PVA@Zn//V₂O₅ full cell demonstrated exceptional cycling stability. The PVA-induced zinc deposition plays a role in preferential crystal orientation and interfacial regulation, providing insights for the future development of stable zinc anodes.
【Key Points of this Paper】
Key Point 1: A durable and stable dendrite-free metallic zinc anode was obtained through the synergistic effect between PVA and OTf⁻ anions.
Key Point 2: PVA coating can suppress HER, corrosion, and surface passivation at the Zn metallic anode interface.
Key Point 3: The deposition/dissolution process of metallic Zn ions was observed in situ using optical microscopy, and the deposition mechanism of zinc along the (002) basal plane and vertically was discussed, providing new insights into the stabilization of zinc plating/stripping through polymer coatings.
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