Li-ion batteries. Characterization of the thermal runaway reactions using a DSC

Lithium-ion batteries are widely used in many applications due to their formidable performance and characteristics. Numerous accidents involving lithium-ion batteries have occurred in recent years and this has led to focus on safety issues related to their extensive use. In this work the Panasonic’s NCR18650 lithium-ion cylindrical cells were investigated by Differential Scanning Calorimetry. The aim is to identify and characterize the main reactions that occur at the anode under thermal abuse conditions and which can lead to thermal runaway. The kinetics of these reactions are assessed using the Kissinger and Ozawa methods. Furthermore, the results show the relationship between the initial state of charge of the cell and the progress of reactions.