Data supporting this article includes electrochemical tests, X-ray diffraction, and SEM images.

This project was studying the effects of different cycling procedures on the lifetime of Li-O2 batteries. In particular, the differences between purely constant current cycling and constant current discharge followed by constant current + potential hold (until current drops to 10% of original current) was investigated.

The Li-O2 cells studied were all cycled 10 times with a capacity limitation of 1 mAh/cm2. They had 1 M LiTFSI in DME electrolyte. The cycling conditions were:

• Constant current discharge and charge, upper cutoff voltage (UCV) 3.5 V, 3.8 V and 4 V
• Constant current discharge and constant current + potential hold charge, UCV 3.5 V, 3.8 V and 4 V
• Constant current discharge and constant current + potential hold charge, LiI redox mediator in electrolyte (5 mM), UCV 3.4 V, 3.5 V, 3.8 V

Electrochemical data are .xlsx files generated by Arbin cycler,

XRD data with Cu source of air electrodes from cells mentioned above

SEM images of the air electrodes mentioned above