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- Title
Thermal, Mechanical, and Ion‐Conductive Properties of Crosslinked Poly[(ethylene carbonate)‐co‐(ethylene oxide)]‐Lithium Bis(fluorosulfonyl)imide Electrolytes.
- Authors
Nishimura, Naomi; Hashinokuchi, Junpei; Tominaga, Yoichi
- Abstract
A random copolymer consisting of ethylene carbonate (EC) and ethylene oxide (EO) units with allyl side groups is synthesized as a matrix for solid polymer electrolytes (SPE). By introducing crosslinking structure to the copolymer, creating a polymer matrix with superior mechanical strength while maintaining good ionic conductivity is being attempted. A tensile test indicates that introduction of the crosslinking structure improves the elastic modulus and maximum stress. When a lithium bis(fluorosulfonyl)imide is added to these polymers at 80 mol%, the conductivity of the crosslinked polymer‐based electrolyte increases slightly. Vogel–Tammann–Fulcher (VTF) analysis reveals that values of the activation energy for crosslinked polymer‐based electrolytes are clearly lower than those of the starting copolymer. The changes in the constant A with increasing salt concentration are very different, but the A values at 80 mol% are almost the same. This VTF behavior suggests that the crosslinking structure has a larger effect on the increase in the carrier ions and also on the decrease in the energy for ionic conduction with increasing salt concentration.
- Subjects
ETHYLENE carbonates; SOLID electrolytes; ELECTROLYTES; POLYELECTROLYTES; FLUOROPOLYMERS; IONIC conductivity; CROSSLINKED polymers; IONOPHORES
- Publication
Macromolecular Chemistry & Physics, 2022, Vol 223, Issue 8, p1
- ISSN
1022-1352
- Publication type
Article
- DOI
10.1002/macp.202100327