Journal
SOLID STATE IONICS
Volume 234, Issue -, Pages 40-45Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2013.01.002
Keywords
Gel polymer electrolyte; Lithium/sulfur polymer battery; Nanostructured sulfur cathode; Sulfur/carbon composite
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Funding
- Positec Co
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canadian Foundation for Innovation (CFI)
- Canada Research Chairs (CRC)
- China Scholarship Council for Study Abroad Scholarship
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A gel polymer electrolyte was formed by trapping lithium bistrifluoromethane-sulfonamide in tetraethylene glycol dimethyl ether electrolyte in a poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)/poly(methylmethacrylate) (PMMA) polymer matrix. The electrochemical properties of the resulting gel were investigated. This electrolyte was used in a lithium polymer cell with a nanostructured sulfur/ketjen black binary composite cathode prepared by wet ball-milling and heat-treatment. The gel polymer battery exhibited a high specific capacity of 753.8 mA h g(-1) at the initial cycle, stable reversible cycling and a capacity retention about 80% over 40 cycles along with a high coulombic efficiency, while the liquid electrolyte cell, in comparison, had low capacity retention and coulombic efficiency. The performance enhancement was attributed to the suppression of shuttle effect by the gel polymer electrolyte leading to higher sulfur utilization in the cell. (C) 2013 Elsevier BM. All rights reserved.
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