Dear Donghoon Lee

Even though we use the same cell chemistry and similar C-rate it won't guarantee the analogous capacity retention behavior. There are many factors that should be considered for optimization such as N/P ratio, porosity, tortuosity, electrode thickness, and temperature distribution (TD) of batteries.

I assume that you are using the same materials for electrode fabrication, so the porosity, tortuosity, and thickness of the electrode will be the same.

As you are using electrodes with different designated capacities for testing, it is possible to have a different N/P ratio.

To achieve better capacity retention behavior it is advised to keep your N/P ratio between 1.1 to 1.2 (based on my previous experience). If you have a lower ratio( 1.2) it will degrade the cathode.

I would recommend getting an optimum N/P ratio by using matching areal capacities of anode and cathode.

T. Subburaj ,

Thank you for your experience based answer. As you said, I didn't concern about NP ratio. I'll conduct the experiment with care of NP ratio !

Thicker electrodes which gives you higher capacity will have less capacity retention due to diffusion limitations, charge transfer limitations, more parasitic reactions with the electrolyte in thicker electrodes, electrode delamination with cycling. You also need to consider to keep the same ratio of electrolyte (according to the loading) in addition to maintaining the same N/P ratios in your cells for comparison. But I would still expect less capacity retention for thicker electrodes ( above 3 mAh/cm2 or 25 mg/cm2 )