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- Title
Cover Picture: Toward Better Sodium-Oxygen batteries: A Study on the Performance of Engineered Oxygen Electrodes based on Carbon Nanotubes (Energy Technol. 3/2015).
- Authors
Bender, Conrad L.; Bartuli, Waldemar; Schwab, Matthias Georg; Adelhelm, Philipp; Janek, Jürgen
- Abstract
Sodium–air batteries: Rechargeable metal–air (or more precisely metal–oxygen) batteries with aprotic electrolytes are very attractive energy stores as they potentially combine low‐cost components and very high energy densities. The reality of this type of battery, however, is complex and fundamental issues still need to be overcome in order to make any application feasible. The lithium–oxygen battery clearly is the front‐runner in recent worldwide research efforts, but recently it was found that replacing lithium by sodium can enable a much more controlled cell reaction by forming sodium superoxide during discharging. In a joint study from the Justus‐Liebig‐University Giessen and BASF SE (Full Paper on page 242), Conrad L. Bender et al. show that the capacity and cycle life of the sodium–oxygen battery can be improved by using technically processed, free‐standing electrodes based on commercial carbon nanotubes. Deep discharging delivers a capacity of 1530 mAh g−1 (at 4.2 mAh cm−2) for a few cycles, but a lifetime of more than 140 cycles is observed for shallow cycling at 0.64 mAh cm−2, and the results are superior in comparison to earlier studies on conventional carbon electrodes. The cover image shows the cell design and images of the carbon nanotube electrode before and after discharge. The discharge product (NaO2) crystallizes in the form of large cubic particles.
- Subjects
CARBON electrodes; CARBON nanotubes; ELECTRIC batteries; CHARTS, diagrams, etc.
- Publication
Energy Technology, 2015, Vol 3, Issue 3, p189
- ISSN
2194-4288
- Publication type
Article
- DOI
10.1002/ente.201590004