Inductive drying of lithium-ion graphite anodes
Aiming an efficient lithium-ion battery production all process steps have to be enhanced in terms of quality and performance. In this regard, the drying process of electrodes holds great potential for improvement. The main disadvantage of state-of-the-art convective drying methods is their negative impact electrode properties on the cyclic stability due to binder and carbon […]
A robust approach to battery SOH estimation combining equivalent circuits with machine learning
Li-ion battery state-of-health (SOH) diagnosis in real-world operating environments remains a challenge. Equivalent circuit models (ECMs) commonly employed by battery management systems suffer from the loss of accuracy over the full range of operating conditions faced in real-life operation. This is because some circuit parameters are functions of the internal states, such as SoC, as […]
Dendritic Nickel Structures in Air Electrodes
Climate change and the limited availability of fossil fuels do not just increase the demand for renewable energy sources, but also for new battery technologies. Metal-air batteries are a promising system for stationary applications. Compared to other battery technologies, they provide a very high theoretical energy density that is just limited by the size of […]
Development of silicon polymer electrodes for all-solid-state lithium-ion batteries
In this work, the development of silicon polymer electrodes is presented. The goal is to obtain silicon polymer electrodes that have a high capacity, capacity retention and coulombic efficiency (CE) as well as a sufficient rate capability (or current density acceptance). The silicon electrodes are produced in atmospheric conditions. Subsequently, they are impregnated with a […]
Comparison of active and passive fillers for the enhancement of the ionic conductivity of polymer-based electrolytes for all-solid-state batteries
All-solid-state batteries (ASSBs) based on solid polymer electrolytes are among the most promising candidates for next-generation batteries because of their improved safety and energy storage performance. However, the low ionic conductivity of polymer electrolytes at ambient temperature is their main limitation. Hybrid solid electrolytes (HSE) constituted of an organic polymer matrix and an inorganic filler […]
Advanced Design of Ni-Rich NCM Cathode Materials synthesized by a Continuously Couette‐Taylor Flow Reactor (CTFR)
In this work, the synthesis of Ni-rich layered cathode materials with advanced particle design (e.g., core-shell or concentration-gradient (CG) particles) by a Couette-Taylor Flow Reactor was evaluated. In order to achieve high energy densities as well as stable long-term cycling performance Ni0.9Mn0.04Co0.05Mg0.01(OH)2 and Ni0.8Mn0.1Co0.1(OH)2 were chosen as core and shell composition, respectively. By using the […]
Generating synthetic customer driving data for databased state prediction of 48V Li-Ion Batteries
In automotive industry a battery management system’s state prediction algorithms can change during the development cycle of a car. Moreover, even serial production cars happen to have different software versions depending on their date of production. Monitored aggregated customer data thus includes state of health (SOH) values generated by different algorithms. To ensure comparability over […]
Balancing group deviation & balancing energy costs due to the provision of frequency containment reserve with a battery storage system in Germany
The energy transition in the electrical energy supply sector is leading to a steadily increasing share of fluctuating renewable energy sources in the power grid. Thus, control reserves such as frequency containment reserve are gaining in importance and need further investigation. In Germany, the power grid is divided into balancing groups, in which supply and […]
Statistical approaches to powder preparation for Si/C anodes in Li-ion Batteries
INTRODUCTION Ball milling is an effective and low-cost production technique to obtain composite materials. However, adjusting the various milling parameters is quite important to prevent contamination formation due to jar-balls reactions and agglomeration of particles. Design of experiment (DOE) technique is the best way to find the effect of inputs and optimize the parameters. In […]
Statistical approaches to powder preparation for Si/C anodes in Li-ion Batteries
INTRODUCTION Ball milling is an effective and low-cost production technique to obtain composite materials. However, adjusting the various milling parameters is quite important to prevent contamination formation due to jar-balls reactions and agglomeration of particles. Design of experiment (DOE) technique is the best way to find the effect of inputs and optimize the parameters. In […]