Understanding solid-state zinc-ion conduction will not only be academically interesting but also benefit the development of energy-dense devices. However, zinc ions in conventional ceramic and polymer hosts are only mobile at high temperatures, and intriguing questions remain regarding the correlation between ionic local environment and conductivity performance. Here, we demonstrate a room-temperature fast zinc-ion conduction in solids with a high degree of molecular flexibility and elucidate the subtle trade-off between molecular-scale interactions and ion transport properties. Importantly, a determining role of the strong cation-anion pairing in suppressing zinc-ion mobility has been experimentally uncovered. When removed, the upper limit of ionic conductivity can be extended to the order of 10⁻⁴ S/cm, exceeding those of previous solid (solvent-free) zinc-ion conductors. Concomitant with the reversible plating/stripping of zinc (over 700 h), the successful creation of solid-state zinc-ion batteries confirms the practical applicability of the resultant conductors.

了解固态锌离子传导不仅将在学术上引起人们的兴趣，还将有益于能量密集型设备的开发。然而，常规陶瓷和聚合物主体中的锌离子仅在高温下才可移动，并且关于离子局部环境与电导率性能之间的相关性仍存在有趣的问题。在这里，我们展示了具有高程度的分子柔性的固体中室温下快速的锌离子传导，并阐明了分子尺度相互作用与离子迁移性质之间的微妙权衡。重要的是，实验上已经发现强阳离子-阴离子对在抑制锌离子迁移率中的决定性作用。去除后，离子电导率的上限可以扩展到10 ^{-4的数量级} S / cm，超过了以前的固态（无溶剂）锌离子导体。伴随着锌的可逆镀覆/剥离（超过700小时），固态锌离子电池的成功创建证实了所得导体的实际适用性。