A gel polymer electrolyte based on initiator-free photopolymerization for lithium secondary batteries

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Highly ion-conductive gel polymer electrolyte (GPE) with mechanical flexibility is developed by incorporating liquid electrolyte into polymer films that are fabricated by initiator-free photopolymerization of poly(ethylene glycol) dimethacrylate (acrylate monomer) and pentaerythritol tetrakis (3-mercaptopropionate) (thiol monomer) blend. When UV is irradiated on the blend, the thiol monomers themselves produce radicals to initiate the polymerization. GPEs with 40-50 wt.% of thiol monomer content show mechanically free standing characteristics with sufficient flexibility. The ionic conductivity of the GPE reaches 1.1 x 10(-3) S cm(-1) at 25 degrees C and is thus high enough to be applied for lithium secondary batteries. The GPE is electrochemically stable up to 4.4V versus Li/Li+ and the unit cells consisting of LiCoO2/GPE/lithium metal show good cycling performance. This GPE is thus considered a good electrolyte candidate for future flexible and wearable lithium secondary batteries. (C) 2011 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2012-01
Language
English
Article Type
Article
Keywords

CROSS-LINKING; ION BATTERY; INTERFACIAL ENHANCEMENT; MECHANICAL-PROPERTIES; NONWOVEN MATRIX; NETWORK POLYMER; PVDF; MEMBRANES; SYSTEM; CELLS

Citation

ELECTROCHIMICA ACTA, v.60, pp.23 - 30

ISSN
0013-4686
DOI
10.1016/j.electacta.2011.10.072
URI
http://hdl.handle.net/10203/95751
Appears in Collection
EEW-Journal Papers(저널논문)CBE-Journal Papers(저널논문)
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