I am using a glove box with N2 supply for Na ion battery coin cell assembly. But the oxygen level is more than 20 ppm. Can anyone one suggest whether 20ppm oxygen level is okay for battery assembly or not?
Ask the glove box maintenance person to regenerate the glove box to minimize moisture and oxygen content (bringing it down to less than 1 ppm). Higher levels might affect your electrolyte, sodium metal surface chemistry and adsorption of moisture on electrode surface is not good. Even poor electronic conductivity, reaction mechanisms...etc could lead to capacity fading. You have to identify the problem and solve it.
No, it is not OK, Na metal is very reactive even if it is stored in an Ar-filled glove box with O2 level < 1ppm it can form a surface oxide layer that can be easily removed before the cell assembly by scarping the surface gently.
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