Revealing instability and irreversibility in nonaqueous sodium-O2 battery chemistry.

Sayed Youssef Sayed Koffi P C Yao David G Kwabi Thomas P Batcho Chibueze V Amanchukwu Shuting Feng Carl V Thompson Yang Shao-Horn

Chem Commun (Camb)

The Research Laboratory of Electronics and the Electrochemical Energy Laboratory, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA. and Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA and Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.

Published: July 2016

Charging kinetics and reversibility of Na-O2 batteries can be influenced greatly by the particle size of NaO2 formed upon discharge, and exposure time (reactivity) of NaO2 to the electrolyte. Micrometer-sized NaO2 cubes formed at high discharge rates were charged at smaller overpotentials compared to nanometer-sized counterparts formed at low rates.

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http://dx.doi.org/10.1039/c6cc02291j	DOI Listing

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