Hi,

There is always Li traces, in SEI or trapped in the material, that will immediately be oxidized. If the aim is to do surface analysis, then its a problem and you must open your coin-cell in Ar filled glove-box then use a transfer chamber. If you just want to see the morphology of the electrode after cycling, in most case it will be ok. Most of the time, under air, the problem is the metallic lithium : separate it rapidly from the rest of the coin-cell or it will burn with your cathode and damaging it. Also, care with the F based electrolyte that will release HF under air.

Try to include a floating potential to C/50 or C/100 in your discharge process, to ensure full delithiation.

Regards

Thanks