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- Title
Toward Better Sodium-Oxygen batteries: A Study on the Performance of Engineered Oxygen Electrodes based on Carbon Nanotubes.
- Authors
Bender, Conrad L.; Bartuli, Waldemar; Schwab, Matthias Georg; Adelhelm, Philipp; Janek, Jürgen
- Abstract
Sodium-oxygen cells with NaO2 as discharge product show very low overvoltages during discharge and charge, and their energy efficiency can be higher than 90 %. In this study the electrochemical behavior of three different free-standing gas diffusion layers (GDL) is discussed, with each prepared by using a straightforward process from commercial starting materials: A pure carbon nanotube (CNT) electrode, a CNT electrode mixed with carbon fibers (CF) and a CNT electrode mixed with carbon black (CB). A solvent-free method was applied to the fabrication of these electrodes, which may help to overcome limitations of common slurry-based processes. NaO2 formed as the sole discharge product for all electrodes tested. The pure CNT electrode performs best in terms of capacity (1530 mAh g−1, 4.2 mAh cm−2) and cycle life (more than 140 cycles), and the results are superior in comparison to previous studies.
- Subjects
OXYGEN electrodes; CARBON nanotubes; ELECTRIC batteries research; CARBON electrodes; CARBON fibers
- Publication
Energy Technology, 2015, Vol 3, Issue 3, p242
- ISSN
2194-4288
- Publication type
Article
- DOI
10.1002/ente.201402208