Superior Rechargeability and Efficiency of Lithium–Oxygen Batteries: Hierarchical Air Electrode Architecture Combined with a Soluble Catalyst |
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| Authors: | Hee‐Dae Lim Hyelynn Song Jinsoo Kim Hyeokjo Gwon Youngjoon Bae Kyu‐Young Park Jihyun Hong Haegyeom Kim Taewoo Kim Prof Yong Hyup Kim Xavier Lepró Raquel Ovalle‐Robles Prof Ray H Baughman Prof Kisuk Kang |
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| Institution: | 1. 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);2. School of Mechanical and Aerospace Engineering, Institute of Advanced Aerospace Technology, Seoul National University, Seoul 151‐742 (Republic of Korea);3. Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, TX 75083‐0688 (USA) |
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| 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). |
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| Keywords: | catalysts carbon nanotubes lithium– oxygen battery redox mediators |
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