Statistical Method to Reduce Relevant Operating Behaviors of BEVs for Testing
The service lifetime of traction batteries of Battery Electric Vehicles (BEVs) is significant for the adoption of BEVs in the market. Many customers are afraid of the longevity of the battery and hesitate to buy a new vehicle. Therefore, in the near future new regulations will come into force to establish a common standard across […]
Global Aging Behavior and Local Aging in Lithium-Ion Batteries due to Inhomogeneous Temperature Distribution
This talk discusses the effect of thermal gradients and thermal transients on the cyclic aging behavior of lithium-ion batteries. The discussion is based on experimental studies on differently sized cells (3.4 Ah cells with NMC / graphite, 20 Ah cell with NMC-LMO / graphite). Fast temperature changes as well as in-plane and through-plane thermal gradients […]
RLPGen: A method to synthetize Representative Battery Load Profiles
Automotive high-voltage batteries react sensitively to the heterogeneity of stress factor combinations. For their development, representative load profiles are derived, wherefore various methods exist. Besides velocity-based cycles, literature also proposes the generation of electrical power trajectories. However, research studies lack a universal framework to create and optimize multivariate battery time series profiles directly from measured […]
Multi-scale battery degradation – Exploring coupled electrochemical and mechanical effects
Understanding battery degradation across scales is essential for long lifetime batteries. In this talk, we explore these multi-scale effects, with a particular focus on coupled electrochemical and mechanical effects. Starting at the particle-level, we highlight how phase field fatigue models can be used to understand electrochemically driven fatigue-fracture behaviour of cathode particles. Here, thresholds between […]
Investigation of localized high-concentration electrolyte-induced interphases in lithium metal batteries
The electrification of the transportation sector and the rising deployment of portable devices have accelerated the development of high-energy-dense batteries and revived interest in lithium metal as a high-capacity anode material alternative to the commonly used graphite. In the presence of well-known organic carbonate-based electrolyte formulations in lithium metal batteries (LMBs), high surface area Li […]
Achieving Stable Cycling Performance of Silicon Anode for Lithium-Ion Batteries by Optimized Electrochemical Pre-Lithiation
Silicon (Si) as an anode active material for lithium-ion batteries (LIBs) has considerably high theoretical specific capacity of 3579 mAh/g. However, a major drawback of Si anodes is their substantial volume expansion (∼300%) during lithiation, leading to significant mechanical stress, electrode pulverization, and unstable solid electrolyte interphase (SEI) formation. These challenges result in rapid capacity […]
Achieving Stable Cycling Performance of Silicon Anode for Lithium-Ion Batteries by Optimized Electrochemical Pre-Lithiation
Silicon (Si) as an anode active material for lithium-ion batteries (LIBs) has considerably high theoretical specific capacity of 3579 mAh/g. However, a major drawback of Si anodes is their substantial volume expansion (∼300%) during lithiation, leading to significant mechanical stress, electrode pulverization, and unstable solid electrolyte interphase (SEI) formation. These challenges result in rapid capacity […]