Vigilancia Tecnológica

A dual?cation polymer gel electrolyte (PVA/Lcys/Zr) is developed via cation coordination chemistry for rechargeable flexible zinc?air batteries. The competitive solvaed Zr4+ reduces the water activity within the coordination shell of Zn2+ and promotes uniform zinc deposition along the (002) crystal plane, while Lcys weakens the interactions between PVA chains and creates a “sliding?rail” dynamic solvation structure that facilitates Zn2+ migration.In semi?open rechargeable flexible zinc?air batteries (RFZABs), the polymer gel electrolyte, influenced by high?water?activity solvation structures during cycling, experiences slow ion conduction and severe dendrite growth, significantly reducing the durability of the zinc anode. This limits its application and development in wearable RFZABs. Thus, modifying the traditional single Zn2+ solvation structure is crucial for enhancing anode stability. Here, a dual?cation solvation strategy is proposed that fundamentally redefines polymer gel electrolyte chemistry and zinc deposition behavior. By incorporating L?cystine (Lcys) as a dynamic modulator within a polyvinyl alcohol (PVA) matrix, Zn2+ and Zr4+ are coordinated to form a robust dual?metal solvation network, which imparts multiple functional advantages: i) competitive solvation by Zr4+ lowers water activity in the Zn2+ coordination shell, effectively suppressing dendritic growth; ii) weakened PVA chain interactions create a “sliding?rail” dynamic solvation structure enhancing Zn2+ migration; and iii) solvated Zr4+ and Zr3Zn1[(OH)2(H2O)4]48+ clusters cooperatively promotes uniform Zn deposition along the (002) crystal plane. As a result, Zn//Zn symmetric cells exhibit an ultralong cycling lifespan of 1628 h, and RFZABs demonstrate stable operation for over 212 h. This dual?cation solvation design offers a scalable and effective pathway for advancing durable, high?performance flexible energy storage systems.