Stefan Käbitz

TL;DR: In this paper, a 40 Ah lithium-ion cell with nickel manganese cobalt oxide (NMC) cathode material was used to investigate the battery impedance and its dependence on the battery state-of-charge (SoC), temperature, current and previous history.

TL;DR: In this paper, an extensive set of accelerated aging tests has been carried out employing a Li-ion high energy 18650 system (2.05-Ah), negative electrode: carbon, positive electrode: Li(NiMnCo)O2).

TL;DR: In this paper, a holistic aging model from accelerated aging tests is presented to analyze the impact of different impact factors on lithium-ion battery aging and lifetime estimation, which is a fundamental aspect for successful market introduction in high-priced goods like electric mobility.

TL;DR: In this article, a multivariable analysis of a detailed series of accelerated lifetime experiments representing typical operating conditions in a hybrid electric vehicle is presented, where the impact of temperature and state of charge on impedance rise and capacity loss is quantified.

TL;DR: In this article, a model based on a system made of a spherical graphite particle surrounded by the solid electrolyte interphase layer was proposed to reproduce capacity fade during battery lifetime, and the model results were compared against cycle life aging experimental data, reproducing accurately the influence of the depth of discharge as well as the average state of charge on the capacity fade.