Cover Feature: Insights Into Thermal Runaway of Li–Ion Cells by Accelerating Rate Calorimetry Coupled with External Sensors and Online Gas Analysis (Batteries & Supercaps 7/2021)

The Cover Feature illustrates the operando analysis of gas evolving from an 18650-type Li-ion cell after provoked venting. This measurement became possible by coupling of accelerated rate calorimetry (ARC) to cause venting and thermal runaway of Li-ion cells intentionally and gas analysis by mass spectrometry (MS). The molecules in the evolved gas are ionized and separated by their mass in a quadrupole analyzer and finally detected as a function of measurement time. This new method (ARC-MS) allowed insights into the thermal runaway behavior of overcharged, aged, and un-aged commercial 18650-type cells. More information can be found in the Article by T. Waldmann and co-workers.