Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 8, Issue 4, Pages 610-614Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2006.02.007
Keywords
Li-S cells; lithium battery; ionic liquid electrolyte; composite sulfur cathode; rechargeability
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A novel room temperature ionic liquid (N-methyl-N-butyl-piperidinium bis(trifluoromethanesulfonyl) imide (PP14-RTIL)) was synthesized and tested as electrolyte for Li/S cells. The CV results revealed that this new RTIL electrolyte has a wide potential window of 5.2 V similar to -0.15 (vs. Li/Li+), and is electrochemically stable and workable for lithium and sulfur electrodes. The charge-discharge experiments of Li/S cells using the PP14- RTIL electrolyte demonstrated that the sulfur cathode can achieve a high initial capacity of 1055 mAh/g and maintains a reversible capacity of ca. 750 mAh/g after a few of cycles, showing a greatly improved dischargeability and cycleability as compared with the sulfur cathodes cycled in organic liquid or polymer electrolytes. (c) 2006 Elsevier B.V. All rights reserved.
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