I had prepare a supercapacitor electrode based metal oxide deposition, I got a high capacitance with good scan rate around 10 A/g but the cyclic stability after 2000 cycle was very low around 30% retention. can anyone suggest me to increase the stability without compromise with capacitance value
Hello Yusuf Khan ,
Yes, long-term stability is something that every research group is working towards. When you say 2000 cycles, what does this equate to in time? Are all the devices demonstrating the low (30%) retention?
Do you have any indication on what is causing the instability? For example, are there any visual physical changes (e.g., swelling of the electrode, change in colour of the electrode or electrolyte, delamination of the electrode from the current collector, etc.)?
What is the configuration of your electrochemical cell? Could it be the stability of something else within your setup.
Have you checked to see if the instability still occurs without cycling? By that I mean construct the electrochemical cell, and leave it in a state of quiescence for the period of time that 2000 cycles equates to. Then check the performance.
You may need to add a filler to your electrode to provide more stuctural integrity, reducing the mechanical stresses during the charge-discharge phases. For instance, this could be some form of polymer that you crosslink.
Hi,
Thank you for your time.
I didn't get any sign of instability like swelling of electrode and changing the colour of electrolyte, And I prepare a single electrode and test it in 3-electrode electrochemical workstation. You mention about the filler can you elucidate this term.
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