Authors: Embla Tharaldsen Bø
Title: Ageing and safety aspects of commercial marine Li-ion batteries at low temperatures
Affiliation: Institute for Energy Technology, IFE
Degradation and ageing of Li-ion batteries will contribute to reduced thermal stability which potentially affects safety performance of the batteries. The fact that aging of lithium-ion cells leads to a reduced capacity and cell life, is extensively covered in the literature by several research groups. The safety effects of ageing are far less studied, with only a handful of empirical studies published.
This poster presents ageing data and safety aspects of large commercial Li-ion cells aged and cycled at 5, 25 and 45°C. Several diagnostic tools have been applied to characterise the ageing mechanisms.
Ageing mechanisms are different at low and high temperatures affecting the thermal stability of the aged cells. The thermal stability of cells which have been aged with different ageing mechanisms was characterized with an ARC. It was observed that a cell cycled at 5°C for 3000 cycles reaching 70% SoH showed a reduced thermal runaway limit from 240 to 150°C compared to uncycled cells.