A novel single lithium‐ion conducting (SLIC) polymer electrolyte containing a weakly coordinating fluorine‐free polysalt is presented. The polysalt, lithium poly(4‐styrenesulfonyl)(dicyano)methide (LiPSDM), is conceived on the basis of a fluorine‐free green chemistry, and motivated by the highly performing non‐fluorinated lithium tricyanomethanide (LiTCM) salt. The electrolyte comprising LiPSDM and poly(ethylene oxide) (PEO) shows good thermal stability, decent ionic conductivity, and high lithium transference number. In stark contrast to other fluorine‐free polysalts, such as, poly(4‐styrenesulfonate) (LiPSS), the replacement of −SO₃⁻ moiety by −SO₂C⁽⁻⁾(CN)₂ improves the flexibility of the anion and the charge delocalization, leading to an improved amorphization of PEO and an overall better performance. Moreover, solid‐state nuclear magnetic resonance (NMR) measurements are performed to unravel the role of anion chemistry on the fundamental transport properties of SLICs. The present work is believed to facilitate the design of high‐performance fluorine‐free polymer electrolytes which are important building blocks for safe, green, and sustainable battery technologies.

中文翻译：

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锂离子导电固体聚合物电解质的弱配位无氟多元盐

提出了一种新型的单锂离子导电（SLIC）聚合物电解质，其中含有弱配位的无氟多元盐。聚盐聚（4-苯乙烯磺酰基）（二氰基）甲基锂（LiPSDM）基于无氟绿色化学原理设计，并受到高性能非氟化三氰胺锂（LiTCM）盐的激发。包含LiPSDM和聚环氧乙烷（PEO）的电解质显示出良好的热稳定性，良好的离子电导率和较高的锂转移数。形成鲜明对比的其它无氟聚合盐，例如，聚（4-苯乙烯磺酸盐）（LIPSS），更换-SO ₃ ^-由-SO部分₂ Ç ^{（ - ）}（CN）₂改善了阴离子的柔韧性和电荷的离域化，从而改善了PEO的非晶化并提高了整体性能。此外，进行了固态核磁共振（NMR）测量以揭示阴离子化学对SLIC的基本转运性质的作用。据信，目前的工作有助于设计高性能的无氟聚合物电解质，这是安​​全，绿色和可持续电池技术的重要组成部分。