Effect of Monomer Polarity on Polymer Dynamics, Glass Transition, and Ionic Conductivity of Polyether Electrolytes
Soma Ahmadi, Danielle DeJonge, Niloofar Safaie, Shaylynn Crum-Dacon, Robert C. Ferrier, Shiwang Cheng
TL;DR
This paper studies how the polarity of monomers affects polymer dynamics, glass transition, and ionic conductivity in polyether electrolytes.
Contribution
The study reveals two distinct salt-induced structures that influence polymer dynamics and ionic conductivity in polyether electrolytes.
Findings
Salt concentration elevates glass transition temperature linearly, unrelated to static dielectric constants.
Salt-induced intrachain and interchain polymer-ion complexes affect chain packing and dynamics.
Polymer electrolytes show disentanglement and unchanged relaxation time separation with salt addition.
Abstract
Combining X-ray scattering, Fourier transform infrared spectroscopy (FT-IR), broadband dielectric spectroscopy (BDS), rheology, and differential scanning calorimetry (DSC), we investigate the ion solvation structures, the polymer dynamics, glass transition, and ionic conductivity of poly(butylene oxide) (PBO, static dielectric constant εsPBO≈4 )/Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), poly(propylene oxide) (PPO, εsPPO≈7 )/LiTFSI, and poly(epichlorohydrin) (PECH, εsPECH≈15 )/LiTFSI. While their molar conductivity follows the Walden rule, these polyether electrolytes exhibit intriguing features in glass transition and viscoelastic properties. In particular, BDS and rheology show clear slowing down of the structural relaxation time, τα , along with a large elevation in glass transition temperature, T g, with salt concentration. DSC results, meanwhile, demonstrate a…
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Taxonomy
TopicsAdvanced Battery Materials and Technologies · Material Dynamics and Properties · Polymer crystallization and properties