Journal
ELECTROCHIMICA ACTA
Volume 52, Issue 5, Pages 2075-2082Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2006.08.016
Keywords
Li/S battery; liquid electrolytes; polymer electrolytes; TEGDME; lithium batteries
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The suitability of some single/binary liquid electrolytes and polymer electrolytes with a 1 M solution of LiCF3SO3 was evaluated for discharge capacity and cycle performance of LUS cells at room temperature. The liquid electrolyte content in the cell was found to have a profound influence on the first discharge capacity and cycle property. The optimum, stable cycle performance at about 450 mAh g(-1\) was obtained with a medium content (12 mu l) of electrolyte. Comparison of cycle performance of cells with tetra(ethylene glycol)dimethyl ether (TEGDME), TEGDME/1,3-dioxolane (DIOX) (1:1, v/v) and 1,2-dimethoxyethane (DME)/di(ethylene glycol)dimethyl ether (DEGDME) (1:1, v/v) showed better results with the mixed electrolytes based on TEGDME. The addition of 5 vol.% of toluene in TEGDME had a remarkable effect of increasing the initial discharge capacity from 386 to 736 mAh g(-1) (by > 90%) and stabilizing the cycle properties, attributed to the reduced lithium metal interfacial resistance obtained for the system. Polymer electrolyte based on microporous poly(vinylidene fluoride) (PVdF) membrane and TEGDME/DIOX was evaluated for ionic conductivity at room temperature, lithium metal interfacial resistance and cycle performance in room-temperature Li/S cells. A comparison of the liquid electrolyte and polymer electrolyte showed a better performance of the former. (c) 2006 Elsevier Ltd. All rights reserved.
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