共晶体系
电解质
盐(化学)
扩散
聚合物
化学
化学工程
聚合物电解质
材料科学
无机化学
冶金
热力学
物理化学
有机化学
离子电导率
微观结构
工程类
物理
电极
作者
Guoli Lu,Jiaping Niu,Xiaofan Du,Chenyang Liu,Min Xing,Dongliang Chao,Yongping He,Lichun Ma,Zhihong Liu,Jingwen Zhao,Yaojian Zhang,Guanglei Cui
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2024-12-19
卷期号:: 296-304
标识
DOI:10.1021/acsenergylett.4c02506
摘要
Cation transport in polymer electrolytes (PEs) is largely limited by insufficient segmental motion. Structural diffusion, often observed in salt-concentrated PEs, is emerging as an appealing transport mode for decoupling the correlation between ionic conductivity and polymer dynamics. However, due to inherently strong ionic association, realizing such a promise for multivalent cations remains challenging. We herein report a eutectic strategy that enhances the structural diffusion dynamics of divalent cations (e.g., Zn2+) in salt-concentrated polycationic PEs to approach levels comparable to those of monovalent cations. The strategic introduction of bipolar ligands (solid acetamide), eutectically inserting into the Zn2+-anion aggregates without directly plasticizing the polymeric skeleton, gives rise to local coordination distortions that weaken anionic traps on Zn2+ mobility. This eutectic perturbation further promotes microphase separation, creating expanded Zn2+ long-range percolating pathways independent of polymer backbones, enabling 3 orders of magnitude increase in ionic conductivity (to 2.4 × 10–5 S cm–1 at 30 °C) and supporting stable zinc metal cell cycling. Our strategy provides an alternative route toward molecular-scale controls over solid-phase conduction of charge-dense cations in PEs.
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