Characteristics of Li2S8-tetraglyme catholyte in a semi-liquid lithium-sulfur battery

Title
Characteristics of Li2S8-tetraglyme catholyte in a semi-liquid lithium-sulfur battery
Author
선양국
Keywords
TEGDME; Polysulfide-catholyte; LiNO3; Semi-liquid; Lithium-sulfur; Battery
Issue Date
2014-11
Publisher
ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Citation
JOURNAL OF POWER SOURCES, 권: 265, 페이지: 14-19
Abstract
In this paper we exploit the use of a Li2S8-containing electrolyte based on a non-flammable TEGDME in a semi-liquid lithium cell, characterized by a configuration usually employed in conventional lithium ion batteries. The cell, using a sulfur-free, Super P carbon electrode shows a capacity varying from 430 mAh g(-1) s to 700 mAh g(-1)s. The cycling tests show that the stability of the cell is strongly affected by the voltage cutoff directly controlling the electrochemical process, in particular the polysulfide shuttle reaction. In this respect, XPS measurement shows the deposition of Li2S2 salt at the lithium electrode surface as the cell voltage cutoff is enlarged, thus suggesting that the use of the reduced voltage and capacity regimes may lead to higher stability. Under the best control regime, the 2 V cell delivers a capacity of 530 mAh g(-1)s, with extremely low polarization and cycling stability extended up to 100 charge-discharge cycles. Furthermore, we demonstrate that enhanced performances may be effectively reached by adding LiNO3 salt to the electrolyte solution to form a stable, protective SEI film on the lithium surface, thus avoiding the shuttle process and increasing the cell efficiency, even under a full voltage cutoff range, i.e. extending from 1 V to 3 V. (C) 2014 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0378775314005667?via%3Dihubhttp://hdl.handle.net/20.500.11754/51410
ISSN
0378-7753; 1873-2755
DOI
10.1016/j.jpowsour.2014.04.074
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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