Dear all,
I am currently facing problems during galvanostatic charge-discharge measurement of half cell of lithium batteries.
Please kindly note that the charge-discharge process was started with electrical impedance spectroscopy (EIS) measurement.
The sequence of measurements was as follows:
1. EIS
2. Charging
3. EIS
4. Discharging
5. Repeat the measurement five times
On the first trial, I found that the charging measurement of the first cycle showed a very low signal-to-noise ratio while other cycles (2 to 5) were fine. The normal curves were observed during the EIS measurement.
To know the problem source, I measured with the same sequence but only one cycle. It turned out that during charging, the measured voltage went like this:
1. increased slowly
2. decreased slowly
3. increased beyond the electrochemical window (around 10 V).
From these problems, what are the possible sources of error? Is it due to the hardware or the half-cell?
Thank you very much in advance!
Best regards,
Efi
Can you show the program/script/commands written to your cycler? This sounds like it might be caused by differences between the commands you intended to give and what the cycler interpreted from your parameters in the first few lines.
Dear Anne Sawhney thank you very much for your answer. I am afraid that I did not write the script; hence I think I am not supposed to share it publicly. For your information, the same script was used in the first number of experiments, and there was no problem found.
Dear Vadim S. Gorshkov
thank you very much for your comment. Yes, you were right to say that 10 V is a very high voltage for any electrolyte. That was why I wrote the title so. As your request, I think I could share the electrolyte type, which is halide-type solid-state electrolyte, and the cathode is a commercially available electrode powder with a similar electrochemical window to the electrolyte.
Dear Giang Nguyen thank you very much for reply. The second experiment had been done for 1 cell.
I have changed the channel since then but the discharge process didn't take place (instead of the charging process in the first cycle of the first experiment).
Dear all, thank you very much for following and answering my question.
So far the cause of the error is not yet known. But I changed the channel, prepared some other samples, and by checking the voltage or resistance of each preparation step using a multimeter, finally a typical charge-discharge curve was obtained.
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