My question is that does the energy efficiency for Li-Ion battery varies for different C rates ? For e.g if a battery is charged and discharged at a lower C rate, would it's energy efficiency would be higher than the one being charged with a higher C rate ? If yes, why ?
I have searched about it, and i know the fact that the battery's capacity depends on the current amplitude extracted from it. At higher discharge rates the capacity is lower, and so will be the output energy. Same is the case with charging, with higher charging current amplitude, the battery wont be charged to its full capacity and the maximum cut-off voltage is reached. But what about the energy efficiency ? Would it also differ for low and high charging and discharging case scenarios ? Or does it remain the same ? Because in high C rate case, we are extracting less energy (capacity x voltage), but we also provided it with less energy while charging it. So doesn't the energy efficiency need to be same for high and low C rates charging/discharging case ?
I hope i am able to make my question clear. Your helpful suggestions and comments would be appreciated. Thankyou