PEIS measurements were conducted at SoCs between 10% and 100% for temperatures 15 °C, 25 °C, 35 °C, and 45 °C in a Swagelok half-cell. The sinusoidal current applied had an amplitude of 10 mV and a 10 mHz -100 kHz frequency range. The data was analysed by fitting to an equivalent circuit model in Zview (Ametek).