Communication—Solvate Ionic Liquid Incorporating Lithium Nitrate as a Redox Mediator for Lithium-Oxygen Batteries. Issue 14 (7th October 2019)

• Record Type: Journal Article
• Authors: Togasaki, Norihiro; Naruse, Takuya; Momma, Toshiyuki; Osaka, Tetsuya
• Is Part Of: Journal of the Electrochemical Society. Volume 166:Issue 14(2019)
• Page Start: A3391
• Page End: A3393
• Publication Date: 2019-10-07
• Subjects: Batteries - Lithium -- Lithium-oxygen batteries -- redox-mediator -- solvation ionic liquid; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0731914jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : A solvate ionic liquid (SIL) of highly concentrated 4.0 M lithium nitrate (LiNO3 ) in a dimethylsulfoxide solution is introduced for lithium-oxygen batteries. As a redox mediator (RM), highly concentrated LiNO3 in the SIL works more effectively than the lower concentrated one to decompose lithium peroxide (Li2 O2 ) on the cathode with an extremely low charging voltage of 3.6 V. In addition, X-ray photoelectron spectroscopy analysis confirms that side products during discharging and charging are markedly restricted in the SIL. The low solubility of Li2 O2 intermediate (LiO2 ) in the SIL may be an important reason for the restriction of side products.