Glass Transition and Relaxation Processes of Nanocomposite Polymer Electrolytes
Artikel i vetenskaplig tidskrift, 2012

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.

fluoride glasses

lithium-ion batteries

modulus spectroscopy

poly(ethylene oxide)

solid electrolytes

ceramic fillers

transport-properties

segmental dynamics

conductivity

structural relaxation

Författare

Benson Koch Money

Chalmers, Teknisk fysik, Kondenserade materiens fysik

K. Hariharan

Indian Institute of Technology, Madras

Jan Swenson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Journal of Physical Chemistry B

1520-6106 (ISSN) 1520-5207 (eISSN)

Vol. 116 7762-7770

Ämneskategorier

Fysik

Kemi

DOI

10.1021/jp3036499