I am reading papers on batteries and although mostly people have reported ionic conductivity in Scm-1 but some have reported DC conductivity as well I and am confused as to what that is. Any help would be appreciated. Thank you.
The electrolysis (or any other redox process at the measurement electrodes) is avoided in an AC conductivity measurement. This is not the case for a DC measurement. Both are measurements of the ionic conductivity.
The type of conductivity (ionic or electronic) stems from the material considered. In a polymer membrane for instance you can measure ionic but not electronic. If electronic is present, you probably can just measure that as it is typically much higher than ionic.
AC vs DC can be important to make sure that the material is not altered by the measurement. Even if there is no electrolysis (a Faradaic process) taking place, there can be polarization or flux of ions in the system in case of DC measurements. Therefore, AC always should be preferred for ionic systems.
That depends also on frequency, thats why impedance measurements are so usefull for such systems.
Thank you Andreas Heyn can you briefly explain what also depends on frequency? And are impedance measurement part of measuring AC or DC ionic conductivity?
maybe the answers on a same question from 2016 are helpful ;-)
https://www.researchgate.net/post/What-is-the-difference-between-ac-ionic-conductivity-and-dc-ionic-conductivity
Thank you Tarmo Tamm As battery electrolytes are ionic conductors why is DC conductivity stated in papers as well. Polymers are used as electrolytes/membranes for batteries as well. But I disagree with you on the point that if electronic conductivity is present, one can measure it as it is generally higher than ionic conductivity. It depends on the material and conditions. I hope to hear from you.
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