In , the effect of current rate on the aging is analyzed cycling the battery at different current rates. Anyway, even if the tests are performed in a climatic chamber at 25 °C, the temperature of the battery cell is not controlled and will change with the current rate due to its internal losses.
Current dependency of cycle aging of lithium ion battery. Thermal and current effects decoupled on cycle aging. Constant battery temperature during cycle aging at different cycle currents using Peltier cells.
In the literature, only a few papers have considered battery aging as a function of the charge/discharge current rate, but they agree that a higher current rate leads to faster battery aging. In any case, all of the tests have been conducted in a climactic chamber with a constant room temperature.
Particularly, fast charging at low temperatures can cause lithium to deposit on the anode of the battery, intensifying heat production and even evolving into thermal runaway of the battery. Based on the simplified battery Alternating current (AC) impedance model, the optimal frequency of pulse current is analyzed.
In this short review, the mechanisms of pulse current improving the performance of lithium-ion batteries are summarized from four aspects: activation, warming up, fast charging and inhibition of lithium dendrites.
The effect of periodic pulse profiles was found to be detrimental to Li-ion battery performance when compared to constant current profiles on a basis of an identical mean current. These effects were hence not attributed to specific electrochemical behaviour but mainly to the well-known effect of Ohm’s law on non-linear impedance.