Comparison of Lithium Salt Effect on Negative Electrodes and Lithium–Air Cell Performance. Issue 1 (13th January 2021)

• Record Type: Journal Article
• Authors: Saito, Morihiro; Fujinami, Taichi; Sohmiya, Minoru; Hayashi, Yoshiya; Koyama, Kazuki; Otsuka, Hiromi; Ito, Kimihiko; Kubo, Yoshimi; Horiba, Tatsuo
• Is Part Of: Journal of the Electrochemical Society. Volume 168:Issue 1(2021)
• Publication Date: 2021-01-13
• Subjects: Energy Storage -- Batteries - Lithium -- Power Sources; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/1945-7111/abd60d
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : The cycle stability of lithium negative electrodes for Li–air secondary batteries was studied under oxygen atmosphere using Li∣Li symmetric cells with three organic electrolyte solutions: 1.0 M LiCF3 SO3 /tetraglyme (G4), 1.0 M LiN(SO2 CF3 )2 /G4, and 1.0 M LiNO3 /G4. Of these, 1.0 M LiNO3 /G4 showed excellent stability without dendrite deposition, even for increased dissolution/deposition capacity from 0.50 to 2.0 mAh cm −2 . These results are considered to be due to the stable Li2 O passivation layer that was formed, not only by the direct reaction with oxygen, but also by the action of NO3 − as an oxidant, which released NO2 − as a redox mediator. Li–O2 cells with 1.0 M LiNO3 /G4 showed a clear charging voltage plateau at 3.7 V, which evidenced the redox mediator effect of NO2 −, and cell cycleability was enhanced to 25 cycles.