Journal
JOURNAL OF POWER SOURCES
Volume 135, Issue 1-2, Pages 1-8Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2004.03.078
Keywords
composite polymer electrolyte; poly(ethylene oxide); SBA-15; ion conductivity; Li-7 NMR spectroscopy
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A composite of mesoporous silica (SBA-15) with a polyethylene oxide (PEO) polymer electrolyte is examined for use in various electrochemical devices. Incorporation of SBA-15 in a PEO:LiClO4 polymer electrolyte facilitates salt dissociation, enhances ion conductivity, and improves miscibility between organic and inorganic moieties. Optimized conductivity is found at 10 wt.% SBA-15 composition, above this concentration the conductivity is reduced due to aggregation of a SBA-15:Li rich phase. Heating above melt temperature of PEO allows more of the polymer segments to interact with SBA-15. This results in a greater degree of disorder upon cooling, and the ion conductivity is enhanced. A Li-7 MAS NMR study reveals three types of lithium-ion coordination. Two major types of conduction mechanism can be identified: one through conventional amorphous PEO; a second via hopping in a sequential manner by replacing the nearby vacancies ('holes') on the surface (both interior and exterior) of the SBA-15 channels. (C) 2004 Elsevier B.V. All rights reserved.
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