I have done Impedance analysis of a pellet with silver pasted electrodes in Hioki3536 LCR meter, but my data is so messy and Zig zag, in nyquist plot. I have make the Pellet again an the data is showing the semicircular trend. Please explain to me the possible reason that can be for this, is my silver pasting is wrong, is there any reason from the Pellet formation, or any other possible reasons.
Hi Naveen
It seems you might have had one of the following issues with your electrode,
1- electrical connection of your paste to the surface of current collector. In another word, you do not have good connection in you system.
2- some times this issue happened because of week adhesion of paste both to the current collector and itself as an structure. It means, particles will separate from the electrode surface and it will affect all equilibrium on the electrode surface which means you may see fluctuation in data.
3- sometimes it happen because of external connection to the cell, like clips, wires, and etc. you should check all connections before start any EIS measurement. all connection should be neat without and oxide or sulfide on the wires and clips. as you might know, you are going to measure variation of current in the range of nA, Micro A, Or at most mA and it is very important to have perfect connections all over the cell.
cheers
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