title: Formation of interfacial layer and long-term cyclability of Li-O₂ batteries.
abstract: The long-term operation of Li-O2 batteries under full discharge/charge conditions is investigated in a glyme-based electrolyte. The formation of stable interfacial layer on the electrode surface during the initial cycling stabilizes reaction products at subsequent cycling stages as demonstrated by quantitative analyses of the discharge products and the gases released during charging. There is a quick switch from the predominant formation of Li2O2 to the predominant formation of side products during the first few cycles. However, after the formation of the stable interfacial layer, the yield of Li2O2 in the reaction products is stabilized at about 33-40%. Extended cycling under full discharge/charge conditions is achievable upon selection of appropriate electrode materials (carbon source and catalyst) and cycling protocol. Further investigation on the interfacial layer, which in situ forms on air electrode, may increase the long-term yield of Li2O2 during the cycling and enable highly reversible Li-O2 batteries required for practical applications.
authors: Energy and Environment Directorate, ‡Fundamental and Computational Sciences Directorate, §William R. Wiley Environmental and Molecular Sciences Laboratory, Pacific Northwest National Laboratory , Richland, Washington 99354, United States.
authors: Eduard N
authors: EN
authors: Nasybulin
authors: Wu
authors: W
authors: Xu
authors: B Layla
authors: BL
authors: Mehdi
authors: Edwin
authors: E
authors: Thomsen
authors: Mark H
authors: MH
authors: Engelhard
authors: Robert C
authors: RC
authors: Massé
authors: Priyanka
authors: P
authors: Bhattacharya
authors: Meng
authors: M
authors: Gu
authors: Wendy
authors: W
authors: Bennett
authors: Zimin
authors: Z
authors: Nie
authors: Chongmin
authors: C
authors: Wang
authors: Nigel D
authors: ND
authors: Browning
authors: Ji-Guang
authors: JG
authors: Zhang