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Annealing To Induce Formation of Defects in Polyether/Li⁺ Complex Crystals – A Way To Significantly Enhance the Crystalline Segmental Mobility

Author:
Wang, Wei, Wu, Jin-Ze, Wang, Jiachen, Chen, Qun, Yao, Ye-Feng
Source:
Macromolecules 2019 v.52 no.15 pp. 5971-5976
ISSN:
1520-5835
Subject:
annealing, carbon, crystals, electrolytes, ethers, lithium, nuclear magnetic resonance spectroscopy, polymers, stable isotopes
Abstract:
In this work, we demonstrate that a deliberately designed annealing process can induce formation of defects in polyether/Li⁺ complex crystals. The Li⁺ concentration diffusion in the complex crystals and the amorphous structures is considered to play a critical role in the formation of crystal defects. The ¹³C 2D exchange NMR shows that the annealing-induced crystal defects can greatly enhance the segmental mobility in the polyether/Li⁺ complex crystals. The rate of helical jump motions in the deliberately annealed polyether/Li⁺ complex crystals is ∼100 times higher than those reported in the literature. This work deepens our understanding of the defect formation in polyether/Li⁺ complex crystals and has important implications on the ionic conduction enhancement of polyether-based crystalline polymer electrolytes.
Agid:
6564218