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UV-derived double crosslinked PEO-based solid polymer electrolyte for room temperature
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DOI：10.1016/j.jcis.2022.09.089.png)
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Abstract
En 中文
The low ionic conductivity at room temperature and poor dimensional stability at high temperature of polyethylene oxide (PEO)-based solid electrolytes greatly limit the development and utilization of solid polymer electrolytes (SPEs). To reconcile the contradiction between electrochemical performance and mechanical strength of PEO-based SPEs, a cross-linking structure with active -CH2CH2O-soft chains that doped with rigid segments is designed and prepared through a method of green ultraviolet irradiation without solvent. The obtained solid film shows a high ionic conductivity of 0.2 mS & BULL;cm �1 and an ionic transference number of 0.51 at room temperature. The activation energy value of 1.92 kJ & BULL;mol-1 gives evi-dence for a favorable migration mechanism of PTP-SPE. A combination of flexibility and strength can be realized by molecular structure design with a tensile elongation of 40%. The reversible overpotential in galvanostatic cycling over 500 h of a Li||Li symmetrical cell indicates that the compact PTP-SPE can inhibit the formation of lithium dendrites. This work provides a new strategy for designing high-performance composite solid electrolytes at room temperature. & COPY; 2022 Elsevier Inc. All rights reserved.
Keywords:
UV curing
Solid polymer electrolytes
Room temperature
Crosslinking
High ionic conductivity
Journal
IF:
9.7
Papers:
3.7W
Citations:
14.7W