Covalent organic frameworks (COFs) with their porous structures that are accommodative of Li salts are considered to be potential candidates for solid-state fast Li+ conductors. However, Li salts simply infiltrated in the pores of solid-state COFs tend to be present in closely associate ion pairs, resulting in slow ionic diffusion dynamics. Here we incorporate cationic skeleton into the COF structure to split the Li salt ion pair through stronger dielectric screening. It is observed that the concentration of free Li+ ions in the resulting material is drastically increased, leading to a significantly improved Li+ conductivity in the absence of any solvent (up to 2.09 × 10-4 S cm-1 at 70 °C).

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用于快速锂离子传导的阳离子共价有机骨架纳米片

具有可容纳锂盐的多孔结构的共价有机骨架 (COF) 被认为是固态快速锂离子导体的潜在候选者。然而，简单地渗入固态 COF 孔中的锂盐往往以紧密结合的离子对存在，导致离子扩散动力学缓慢。在这里，我们将阳离子骨架结合到 COF 结构中，通过更强的介电屏蔽来分裂锂盐离子对。据观察，所得材料中游离 Li+ 离子的浓度急剧增加，导致在没有任何溶剂的情况下显着提高 Li+ 电导率（在 70 °C 时高达 2.09 × 10-4 S cm-1）。