In a paper I read that the spikes during a charge-discharge measurement is the current interrupts. I got similar thing when I'm doing CV using Arbin 2000. I wonder what is this current interrupts? what does it mean?
I suggest that you should check out your cell, please test your cells more than three times, then, find out if it is a technical problems.Some experience tell me that electrode holder rust can also be a possible reason, you should handle it with a piece of sandpaper. I wish these suggestions can help you.
So, first, current interrupt (CI) is a mechanism to measure and control for uncompensated resistance in a cell (which may be called Ru, ESR, HFR). The system stops (interrupts) the current and measures the fast voltage relaxation. Because the fast change is only due to the stopping of the current it is proportional to Ru. When the current comes back up you can get a current spike as the system returns to the potential it was at. Note that your data shows current spikes, while the other data is showing voltage relaxation.
That said, while CI will always increase the noise somewhat, the large spikes you are seeing are not usual, and would generally indicate either that you are scanning too fast to effectively use CI or that the system measuring the current is isolated from the one supplying it (and controlling the potential).
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