Evidence for lithium superoxide-like species in the discharge product of a Li-O-2 battery
- Authors
- Yang, Junbing; Zhai, Dengyun; Wang, Hsien-Hau; Lau, Kah Chun; Schlueter, John A.; Du, Peng; Myers, Deborah J.; Sun, Yang Kook; Curtiss, Larry A.; Amine, Khalil
- Issue Date
- Jan-2013
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.15, no.11, pp.3764 - 3771
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL CHEMISTRY CHEMICAL PHYSICS
- Volume
- 15
- Number
- 11
- Start Page
- 3764
- End Page
- 3771
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/26795
- DOI
- 10.1039/c3cp00069a
- ISSN
- 1463-9076
- Abstract
- We report on the use of a petroleum coke-based activated carbon (AC) with very high surface area for a Li-O-2 battery cathode without the use of any additional metal catalysts. Electrochemical measurement in a tetra(ethylene) glycol dimethyl ether-lithium triflate (TEGDME-LiCF3SO3) electrolyte results in two voltage plateaus during charging at 3.2-3.5 and 4.2-4.3 V versus Li+/Li. Herein we present evidence from Raman and magnetic measurements that the lower plateau corresponds to a form of lithium peroxide with superoxide-like properties characterized by a low temperature magnetic phase transition and a high O-O stretching frequency (1125 cm(-1)). The magnetic phase transition and the high O-O stretching frequency disappear when charged to above 3.7 V. Theoretical calculations indicate that a surface superoxide structure on lithium peroxide clusters and some lithium peroxide surfaces have an unpaired electron and a high O-O stretching frequency that help explain the observations. These results provide evidence that the form of the lithium peroxide discharge product is important to obtaining a low charge overpotential, and thus improving the round-trip efficiency between discharge and charge.
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