Coupling of nitroxyl radical as an electrochemical charging catalyst and ionic liquid for calcium plating/stripping toward a rechargeable calcium–oxygen battery. Issue 25 (14th June 2017)

• Record Type: Journal Article
• Authors: Shiga, Tohru; Kato, Yuichi; Hase, Yoko
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 25(2017)
• Page Start: 13212
• Page End: 13219
• Publication Date: 2017-06-14
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7ta03422a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Nitroxyl radical (TEMPO) and ionic liquid with a bis(trifluoromethanesulfonyl) amide anion lead to novel rechargeable non-aqueous Ca–O2 batteries. Abstract : There are two problems to overcome to realize a non-aqueous rechargeable calcium–oxygen battery: lack of a catalyst for decomposing calcium oxide (CaO) as the main discharge product, and irreversible deposition/dissolution of Ca 2+ at the anode. First, the catalytic capability of 2, 2, 6, 6-tetramethylpiperidine 1-oxyl (TEMPO)–anion complex to decompose CaO at the O2 electrode was examined. Charge transfer from the TEMPO–anion complex to CaO occurred, leading to effective decomposition of CaO. Second, the deposition/dissolution behavior of Ca 2+ was investigated in N, N -diethyl- N -methyl- N -(2-methoxyethyl) ammonium bis(trifluoromethanesulfonyl) amide at 60 °C. We observed partially reversible Ca plating/stripping under a high sweep rate in the ionic liquid. Finally we fabricated a rechargeable Ca–O2 battery using the TEMPO catalyst for the cathode, Ca chips for the anode, and an ionic liquid, and demonstrated that the battery showed repeated discharge/charge performance.