The following determination of the iR Rinternal and later calculated Area specific impedance (ASI) value was performed using the Hybrid Pulse Power Characterization (HPPC) method including a 3C discharge pulse of 30s after discharging the cell to 4 V which is assumed to be equal to 75% state of charge (SOC). The SOC was defined based on the used voltage window (2.9 -4.2 V).