Insights into Battery Thermal Runaway Reactions Via in Situ gas Analysis during Heating

In order to prevent and mitigate lithium-ion battery thermal runaway, a better understanding of the chemical reactions responsible is needed. Here, we present an in situ method to quantitatively analyze gaseous products generated within lithium-ion battery cells during controlled heating. This laboratory-scale testing allows for cost- and time- effective evaluation of cell chemistries at early stages in the material development process. The findings combined with other techniques such as differential scanning calorimetry and temperature programmed decomposition provide insights into the reactions occurring in the lead-up to thermal runaway and provide a new method to assess thermal runaway propensity of lithium-ion battery cells as a function of chemistry (i.e., cathode, electrolyte) and state of charge.