Nano letters, 2011-11, Vol.11 (11), p.5071-5078
2011
Volltextzugriff (PDF)
Details
- Autor(en) / Beteiligte
- Titel
- Hierarchically Porous Graphene as a Lithium–Air Battery Electrode
- Ist Teil von
- Nano letters, 2011-11, Vol.11 (11), p.5071-5078
- Ort / Verlag
- Washington, DC: American Chemical Society
- Erscheinungsjahr
- 2011
- Quelle
- MEDLINE
- Beschreibungen/Notizen
- The lithium–air battery is one of the most promising technologies among various electrochemical energy storage systems. We demonstrate that a novel air electrode consisting of an unusual hierarchical arrangement of functionalized graphene sheets (with no catalyst) delivers an exceptionally high capacity of 15000 mAh/g in lithium–O2 batteries which is the highest value ever reported in this field. This excellent performance is attributed to the unique bimodal porous structure of the electrode which consists of microporous channels facilitating rapid O2 diffusion while the highly connected nanoscale pores provide a high density of reactive sites for Li–O2 reactions. Further, we show that the defects and functional groups on graphene favor the formation of isolated nanosized Li2O2 particles and help prevent air blocking in the air electrode. The hierarchically ordered porous structure in bulk graphene enables its practical applications by promoting accessibility to most graphene sheets in this structure.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 1530-6984eISSN: 1530-6992DOI: 10.1021/nl203332eTitel-ID: cdi_proquest_miscellaneous_903149285
- Format
- –
- Schlagworte
- Accessibility, Air, Applied sciences, Blocking, Catalytic methods, Channels, Condensed matter: structure, mechanical and thermal properties, Cross-disciplinary physics: materials science, rheology, Diffusion, Diffusion in nanoscale solids, Diffusion in solids, Direct energy conversion and energy accumulation, Electric Power Supplies, Electrical engineering. Electrical power engineering, Electrical power engineering, Electrochemical conversion: primary and secondary batteries, fuel cells, Electrodes, Equipment Design, Equipment Failure Analysis, Exact sciences and technology, Fullerenes and related materials, diamonds, graphite, Graphene, Graphite - chemistry, Lithium - chemistry, Lithium batteries, Materials science, Methods of nanofabrication, Nanostructure, Nanotechnology - instrumentation, Physics, Porosity, Specific materials, Transport properties of condensed matter (nonelectronic)