Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 38, Issue 8, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201600652
Keywords
carbon dioxide; ethylene carbonate/ethylene oxide copolymer; ionic conductivity; lithium-ion batteries; polymer electrolytes
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Funding
- JSPS KAKENHI, Japan [25288095, 16H04199]
- Grants-in-Aid for Scientific Research [25288095, 16H04199] Funding Source: KAKEN
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A random copolymer of ethylene oxide with CO2, namely, poly(ethylene carbonate/ethylene oxide) (P(EC/EO)), has been synthesized as a novel candidate for polymer electrolytes. Electrolyte composed of P(EC/EO) and lithium bis(fluorosulfonyl) imide has an ionic conductivity of 0.48 mS cm(-1) and a Li transference number (t(+)) of 0.66 at 60 degrees C. To study ion-conductive behavior of P(EC/EO)-based electrolytes, the Fourier transform infrared (FT-IR) technique is used to analyze the interactions between Li+ and functional groups of the copolymer. The carbonate groups may interact preferentially with Li+ rather than the ether groups in P(EC/EO). This study suggests that copolymerization of carbonate and flexible ether units can realize both high conductivity and t+ for polymer electrolytes. High-performance P(EC/EO) electrolyte is expected to be a candidate material for use in all-solid-state batteries.
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