Title:
Helical covalent polymers with unidirectional ion channels as single lithium-ion conducting electrolytes
Year of Publication:
2021
Authors:
Yiming Hu, Nathan Dunlap, Hai Long, Hongxuan Chen, Lacey J Wayment, Michael Ortiz, Yinghua Jin, Abdulrahiman Nijamudheen, Jose L Mendoza-Cortes, Se-hee Lee, Wei Zhang
Journal:
CCS Chemistry
Abstract:
Single-ion conducting polymer electrolytes have attracted great attention as safe alternatives to liquid electrolytes in high energy density lithium-ion batteries. Herein, we report the first example of a crystalline anionic helical polymer as a single lithium-ion conducting solid polymer electrolyte (SPE). Single-crystal X-ray analysis shows that the polymer folds into densely packed double helices, with bundles of unidirectional negatively charged channels formed that can facilitate lithium-ion transportation. Such a helical covalent polymer (HCP) exhibits excellent room temperature lithium-ion conductivity (1.2 × 10−3 S·cm−1) in the absence of external lithium salts, a high transference number (0.84), low activation energy (0.14 eV), and a wide electrochemical stability window (0.2–5 V). We found that nonflammable, nonvolatile ionic liquid can serve as a solvating medium and excellent conductivity enhancer (>1000 times …
URL:
https://www.chinesechemsoc.org/doi/abs/10.31635/ccschem.021.202101257