Li ion transport in an intercalated polymer electrolyte

Arun, N. ; Vasudevan, S. ; Ramanathan, K. V. (2003) Li ion transport in an intercalated polymer electrolyte Journal of Chemical Physics, 119 (5). pp. 2840-2848. ISSN 0021-9606

[img]
Preview
PDF - Author Version
195kB

Official URL: http://jcp.aip.org/resource/1/jcpsa6/v119/i5/p2840...

Related URL: http://dx.doi.org/10.1063/1.1587694

Abstract

Lithium ions solvated by polyethylene-oxide (PEO) have been confined by intercalation within the galleries of an insulating, inorganic layered solid CdPS3. The dc conductivity of this confined polymer electrolyte Cd0.75PS3Li0.5(PEO) displays a distinct change in the mechanism of conduction with temperature, exhibiting a crossover from an Arrhenius temperature dependence at low temperatures to an non-Arrhenius, Vogel-Tamman-Fulcher behavior at higher temperatures. We use 2H, 7Li, and 13C nuclear magnetic resonance (NMR) in combination with infrared spectroscopy to probe Li ion mobility as well as segmental motion of the intercalated PEO. Within the galleries of Cd0.75PS3Li0.5(PEO) both rigid and mobile fractions of the intercalated polymer are present with the equilibrium fraction of the mobile species increasing with temperature. The 7Li (I = 3/2) NMR of the confined polymer electrolyte exhibits an unusual behavior-the appearance of quadrupolar satellites at high temperatures where the conductivity values are appreciable. The results signify the solvation of Li ions by mobile segments of the intercalated PEO. Further proof of this association is seen in the 13C NMR as well as infrared spectra, both of which show evidence of the complexation of Li ions by ether linkages of the interlamellar PEO at high temperature and the absence of such an association at lower temperature when polymer motion is absent.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
Keywords:Lithium; Positive Ions; Nuclear Magnetic Resonance; Ion Mobility; Solvation; Polymer Electrolytes; Infrared Spectra; Intercalation Compounds
ID Code:58556
Deposited On:31 Aug 2011 12:12
Last Modified:18 May 2016 09:28

Repository Staff Only: item control page