European Commission, Joint Research Centre (JRC) 1 article published in JoVE Chemistry Identification and Quantification of Decomposition Mechanisms in Lithium-Ion Batteries; Input to Heat Flow Simulation for Modeling Thermal Runaway Ibtissam Adanouj1, Ákos Kriston2, Vanesa Ruiz1, Andreas Pfrang1 1European Commission, Joint Research Centre (JRC), The Netherlands, 2European Commission, Joint Research Centre (JRC), Italy This work aims at determining the reaction kinetics of Li-ion battery cathode and anode materials undergoing thermal runaway (TR). Simultaneous Thermal Analysis (STA)/Fourier Transform Infrared (FTIR) spectrometer/Gas Chromatography Mass Spectrometry (GC-MS) were used to reveal thermal events and to detect evolved gases.