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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 17: Focus Session: Battery Materials – Experimental Characterisation and Safety Testing (joint session KFM/MM)

KFM 17.1: Invited Talk

Wednesday, March 20, 2024, 15:00–15:30, EMH 225

Reversible and irreversible heat effects in batteries and battery materials — •Andreas Jossen — Technical University of Munich, School of Engineering and Design, Department of Energy and Process Engineering, Chair for Electrical Energy Storage Technology, Arcisstrasse 21, 80333 Munich, Germany

Heat generation within batteries is caused by different effects, as entropy, over-potentials and voltage hysteresis. These effects depend on the state of charge and the state of health of the battery and the resulting temperature strongly influences the performance of the system. Therefore measuring of these heat effects is of high interest to support the material and cell design development. Especially of large format cells, as used in electric vehicles, the heat balance strongly influences the fast charge capability on system level. The presentation introduces the different effects and describes measurement methods (calorimetric and electrical based) and discusses the challenges for the different methods. Improved measurement methods are presented and measurement examples for some high-energy materials are discussed. An example where upscaling from a material level to large format cell is shown

Keywords: Entropy; Heat effect; Calorimetry; Voltage hysteresis; Heat balance