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Cycling performance of lithium metal polymer cells assembled with ionic liquid and poly(3-methyl thiophene)/carbon nanotube composite cathode

journal contribution
posted on 15.05.2008, 00:00 authored by D W Kim, S Sivakkumar, D MacFarlane, Maria ForsythMaria Forsyth, Y K Sun
A poly(3-methylthiophene) (PMT)/multi-walled carbon nanotube (CNT) composite is synthesized by in situ chemical polymerization. The PMT/CNT composite is used as an active cathode material in lithium metal polymer cells assembled with ionic liquid (IL) electrolytes. The IL electrolyte consists of 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF4) and LiBF4. A small amount of vinylene carbonate is added to the IL electrolyte to prevent the reductive decomposition of the imidazolium cation in EMIBF4. A porous poly(vinylidene fluoride-co-hexafluoropropylene) (P(VdF-co-HFP)) film is used as a polymer membrane for assembling the cells. Electrochemical properties of the PMT/CNT composite electrode in the IL electrolyte are evaluated and the effect of vinylene carbonate on the cycling performance of the lithium metal polymer cells is investigated. The cells assembled with a non-flammable IL electrolyte and a PMT/CNT composite cathode are promising candidates for high-voltage–power sources with enhanced safety.

History

Journal

Journal of power sources

Volume

180

Issue

1

Pagination

591 - 596

Publisher

Elsevier SA

Location

Switzerland

ISSN

0378-7753

eISSN

1873-2755

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2008, Published by Elsevier B.V.