Nanoporous hybrid electrolytes
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Oligomer-suspended SiO(2)-polyethylene glycol nanoparticles are studied as porous media electrolytes. At SiO(2) volume fractions, phi, bracketing a critical value phi(y) approximate to 0.29, the suspensions jam and their mechanical modulus increase by more than seven orders. For phi > phi(y), the mean pore diameter is close to the anion size, yet the ionic conductivity remains surprisingly high and can be understood, at all phi, using a simple effective medium model proposed by Maxwell. SiO(2)-polyethylene glycol hybrid electrolytes are also reported to manifest attractive electrochemical stability windows (0.3-6.3 V) and to reach a steady-state interfacial impedance when in contact with metallic lithium.
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This work was supported by Award No. KUS-C1-018-02, made
by King Abdullah University of Science and Technology
(KAUST), and by the National Science Foundation, Award No.
DMR-1006323. JLN also acknowledges support from the
Materials for a Sustainable Future IGERT program, NSF grant
# DGE-0903653.
Date Issued
2011-02-15
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Royal Society of Chemistry
Keywords
ROYAL SOC CHEMISTRY; THOMAS GRAHAM HOUSE; EFFECTIVE CONDUCTIVITY; ELECTRICAL-PROPERTIES; IONIC-LIQUID; PERFORMANCE; COPOLYMER; CATHODE; CELL
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http://pubs.rsc.org/en/content/articlepdf/2011/jm/c0jm04171h
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J. Mater. Chem., 2011,21, 10094-10101
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0959-9428
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