title: Superior rechargeability and efficiency of lithium-oxygen batteries: hierarchical air electrode architecture combined with a soluble catalyst.
abstract: The lithium-oxygen battery has the potential to deliver extremely high energy densities; however, the practical use of Li-O2 batteries has been restricted because of their poor cyclability and low energy efficiency. In this work, we report a novel Li-O2 battery with high reversibility and good energy efficiency using a soluble catalyst combined with a hierarchical nanoporous air electrode. Through the porous three-dimensional network of the air electrode, not only lithium ions and oxygen but also soluble catalysts can be rapidly transported, enabling ultra-efficient electrode reactions and significantly enhanced catalytic activity. The novel Li-O2 battery, combining an ideal air electrode and a soluble catalyst, can deliver a high reversible capacity (1000 mAh g(-1) ) up to 900 cycles with reduced polarization (about 0.25 V).
authors.affiliation: Center for Nanoparticle Research Institute for Basic Science (IBS), Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul 151-742 (Republic of Korea).
authors.forename: Hee-Dae
authors.initials: HD
authors.lastname: Lim
authors.forename: Hyelynn
authors.initials: H
authors.lastname: Song
authors.forename: Jinsoo
authors.initials: J
authors.lastname: Kim
authors.forename: Hyeokjo
authors.initials: H
authors.lastname: Gwon
authors.forename: Youngjoon
authors.initials: Y
authors.lastname: Bae
authors.forename: Kyu-Young
authors.initials: KY
authors.lastname: Park
authors.forename: Jihyun
authors.initials: J
authors.lastname: Hong
authors.forename: Haegyeom
authors.initials: H
authors.lastname: Kim
authors.forename: Taewoo
authors.initials: T
authors.lastname: Kim
authors.forename: Yong Hyup
authors.initials: YH
authors.lastname: Kim
authors.forename: Xavier
authors.initials: X
authors.lastname: Lepró
authors.forename: Raquel
authors.initials: R
authors.lastname: Ovalle-Robles
authors.forename: Ray H
authors.initials: RH
authors.lastname: Baughman
authors.forename: Kisuk
authors.initials: K
authors.lastname: Kang
keywords: carbon nanotubes; catalysts; lithium-oxygen battery; redox mediators