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Glass Transition and Relaxation Processes of Nanocomposite Polymer Electrolytes

Benson Koch Money (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; K. Hariharan ; Jan Swenson (Institutionen för teknisk fysik, Kondenserade materiens fysik)
Journal of Physical Chemistry B (1520-6106). Vol. 116 (2012), 26, p. 7762-7770.
[Artikel, refereegranskad vetenskaplig]

This study focus on the effect of delta-Al2O3 nanofillers on the dc-conductivity, glass transition, and dielectric relaxations in the polymer electrolyte (PEO)(4):LiClO4. The results show that there are three dielectric relaxation processes, alpha, beta, and gamma, in the systems, although the structural alpha-relaxation is hidden in the strong conductivity contribution and could therefore not be directly observed. However, by comparing an enhanced dc-conductivity, by approximately 2 orders of magnitude with 4 wt % delta-Al2O3 added, with a decrease in calorimetric glass transition temperature, we are able to conclude that the dc-conductivity is directly coupled to the hidden alpha-relaxation, even in the presence of nanofillers (at least in the case of delta-Al2O3 nanofillers at concentrations up to 4 wt %). This filler induced speeding up of the segmental polymer dynamics, i.e., the alpha-relaxation, can be explained by the nonattractive nature of the polymer-filler interactions, which enhance the "free volume" and mobility of polymer segments in the vicinity of filler surfaces.

Nyckelord: lithium-ion batteries, poly(ethylene oxide), solid electrolytes, fluoride glasses, structural relaxation, modulus spectroscopy, transport-properties, segmental dynamics, ceramic fillers, conductivity

Denna post skapades 2012-09-04. Senast ändrad 2017-10-03.
CPL Pubid: 162849


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Institutionen för teknisk fysik, Kondenserade materiens fysik (1900-2015)



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