Eutectic Crystallization Activates Solid‐State Zinc‐Ion Conduction
Huayu Qiu, Rongxiang Hu, Xiaofan Du, Zhou Chen, Jingwen Zhao, Guoli Lu, Meifang Jiang, Qingyu Kong, Yiyuan Yan, Junzhe Du, Xinhong Zhou, Guanglei Cui
Abstract
Abstract Solid‐state zinc (Zn) batteries offer a new candidate for emerging applications sensitive to volume, safety and cost. However, current solid polymeric or ceramic electrolyte structures remain poorly conductive for the divalent Zn 2+ , especially at room temperature. Constructing a heterogeneous interface which allows Zn 2+ percolation is a viable option, but this is rarely involved in multivalent systems. Herein, we construct a solid Zn 2+ ‐ion conductor by inducing crystallization of tailored eutectic liquids formed by organic Zn salts and bipolar ligands. High‐entropy eutectic‐networks weaken the ion‐association and form interfacial Zn 2+ ‐percolated channels on the nucleator surfaces, resulting in a solid crystal with exceptional selectivity for Zn 2+ transport ( t =0.64) and appreciable Zn 2+ conductivity ( σ =3.78×10 −5 S cm −1 at 30 °C, over 2 orders of magnitude higher than conventional polymers), and finally enabling practical ambient‐temperature Zn/V 2 O 5 metal solid cells. This design principle leveraged by the eutectic solidification affords new insights on the multivalent solid electrochemistry suffering from slow ion migration.