GITT was conducted at temperatures of 5 °C, 15 °C, 25 °C, 35 °C, and 45 °C in a three-electrode cell between 2.5 V and 4.2 V. Transients were C/10 CC for 150 seconds and the relaxation period was limited to a duration of 2 hours or when the voltage decay with time was dE/dt < 0.1 mV h -1 .