Electrochemical characteristics of phase-separated polymer electrolyte based on poly(vinylidene and ethylene fluoride-co-hexafluoropropane) carbonate

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A polymer electrolyte based on microporous poly(vinylidene fluoride-co-hexafluoropropane) (PVdF-HFP) film was studied for use in lithium ion batteries. The microporous PVdF-HFP (Kynar 2801) matrix was prepared from a cast of homogeneous mixture of PVdF-HFP and solvents such as ethylene carbonate (EC), dimethyl carbonate (DMC), and ethyl methyl carbonate (EMC). After evaporation of DMC and EMC, a sold film of the PVdF-HFP and the EC mixture was obtained. EC-rich phase started its formation in the PVdF-HFP/EC film at EC content of about 60 wt.% based on the total weight of PVdF-HFP and EC. The formation of the new phase resulted in the abrupt increase of the porosity of the PVdF-HFP matrix from 32 to 62%. The ionic conductivity of the film soaked in I M LiPF6-EC/DMC = 1/1 was significantly increased from order of 10(-4) S/cm to order of 10(-3) S/cm. at the EC content of 60 wt.%. Thermal and spectroscopic investigations showed that most of the EC interact with PVdF-HFP with the EC content being below 60 wt.%. MCMB/polymer electrolyte/LiCoO2 cells employing the microporous PVdF-HFP polymer film showed stable charging/discharging characteristics at I C rate and good rate capability. (C) 2003 Elsevier Science Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2003-04
Language
English
Article Type
Article
Keywords

LITHIUM-ION BATTERIES; CONDUCTIVITY; PVDF; TRANSPORT; BLEND; MORPHOLOGY; FILMS; PMMA

Citation

ELECTROCHIMICA ACTA, v.48, no.10, pp.1339 - 1346

ISSN
0013-4686
DOI
10.1016/S0013-4686(02)00846-0
URI
http://hdl.handle.net/10203/175531
Appears in Collection
CBE-Journal Papers(저널논문)
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