Electrochem Seminar- Inhomogeneous Aging in Lithium-Ion Batteries Caused by Temperature Gradients
Electrochem Seminar- Inhomogeneous Aging in Lithium-Ion Batteries Caused by Temperature Gradients
Abstract
Looking at the aging behavior of lithium-ion batteries, the internal cell temperature is one main influencing factor. In general, an optimum temperature of about 25 °C is assumed with increasing degradation both at rising and declining temperatures. However, the impact of temperature gradients on cell behavior and aging is not completely understood. This work focuses on how external thermal boundary conditions during cycling affect the overall degradation (capacity, impedance) as well as the local degradation effects and their distribution on electrode level via its thickness, SEM, XRD and ICP-OES. These measurements reveal a strong temperature-dependent inhomogeneity in aging mechanisms, while the overall aging behavior is not significantly altered by temperature gradients but corresponds to the average temperature. Temporal temperature changes, on the other hand, induce significantly different degradation effects that cannot be correlated with the average temperature
Speaker
Sabine PaarmannDr Sabine Paarmann is at the Karlsruhe Institute of Technology (KIT), where she works as a Research Associate in the Institute of Thermal Process Engineering (TVT). Last year, she finished her PhD focusing on the influence of thermal boundary conditions on the performance and ageing behaviour of lithium-ion cells. She has previously worked as a visiting scientist at the University of Warwick, MAHLE Industrial Thermal Systems America and BASF. This summer, she will start as a senior postdoc with a Marie Curie Fellowship at Imperial College London.