Open AccessCycling Performances of Lithium-Air Cells Assembled with Mixed Electrolytes of Ionic Liquid and Diethylene Glycol Diethyl Ether
Author(s) -
Sang Yong Han,
Jae Hong Kim,
Dong Won Kim
Publication year - 2015
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/2.0161502jes
Subject(s) - electrolyte , ionic liquid , chemistry , ionic conductivity , diethylene glycol , sulfonyl , ethylene glycol , inorganic chemistry , lithium (medication) , chemical engineering , organic chemistry , electrode , alkyl , medicine , engineering , endocrinology , catalysis
Ionic liquid-based electrolytes composed of diethylene glycol diethyl ether (DEGDEE) and 1-butyl-1-methyl pyrrolidinium bis(trifluoromethane) sulfonyl imide (BMP-TFSI) were prepared and evaluated for non-aqueous lithium-air cell applications. Adding an appropriate amount of BMP-TFSI to the electrolyte solution improved ionic conductivity, oxidative stability and interfacial stability, and reduced flammability and volatility. When BMP-TFSI was mixed with DEGDEE under optimal condition, the cycle performance was remarkably improved as compared with either the organic electrolyte or ionic liquid electrolyte alone. The Li-air cell assembled with an optimized ionic liquid-based mixed electrolyte initially delivered a high discharge capacity of 10,620 mAh g(-1) and exhibited good cycling stability exceeding 150 cycles at a current density of 0.1 mA cm(-2) by limiting depth of discharge to 500 mAh g(-1). (C) The Author(s) 2015. Published by ECS.Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korea government Ministry of Trade, Industry and Energ