Corrosion investigation in polymer lithium sulphur batteries
Current battery technology is searching different alternatives for Li-Ion batteries. One of the promising type are lithium sulfur batteries where cathode is reaching extremely high theoretical capacity by replacement of lithium transition metal oxides by elemental sulphur. Considering challenges related with polysulfides diffusion polymer electrolytes are attractive candidates in the final cells preventing unwanted diffusion […]
Influence of aging on the failing behavior of automotive lithium-ion batteries
Lithium-ion batteries (LIBs) are a dominant state-of-the-art energy storage system and have importance in the automotive sector. Still, LIBs suffer from aging effects and serious hazards from failing batteries are possible. These failures can lead to exothermic chemical reactions inside the cell, ending up in thermal runaway (TR). TR has caused most electric vehicle (EV) […]
Efficient battery function development by application of battery-as-a-service concepts
In the proposed conference contribution, we introduce a novel test approach for battery systems, that is driven by a unified, standardized interface between hardware- and software components. It allows to seamlessly exchange real hardware components with software components, and vice versa. The Distributed Co-Simulation Protocol (DCP) is used to encapsulate and virtualize these components, as […]
Comparison of a discontinuous and continuous slurry manufacturing process for silicon-containing anodes in lithium-ion batteries
Intensive efforts have been made to improve the energy density of lithium-ion batteries. Particularly, it has been proven to be advantageous to use active materials containing silicon due to their high capacity. For this reason, the processing of active materials containing silicon is becoming increasingly popular. Additionally, the production of battery slurries in a continuous […]
Comparison of a discontinuous and continuous slurry manufacturing process for silicon-containing anodes in lithium-ion batteries
Intensive efforts have been made to improve the energy density of lithium-ion batteries. Particularly, it has been proven to be advantageous to use active materials containing silicon due to their high capacity. For this reason, the processing of active materials containing silicon is becoming increasingly popular. Additionally, the production of battery slurries in a continuous […]
Thermal oxidation enables stable microsized mesoporous silicon anode for lithium-ion batteries
Silicon (Si) has been considered the most promising next-generation anode material for lithium-ion batteries (LIBs) due to its high theoretical capacity (3579 mAh/g) and safe potential (0.45 V vs Li/Li+). However, it suffers from a quick capacity fading caused by the large volume changes (300%) during the lithiation/delithiation process. Silicon oxides (SiOx) show less volume […]
Simulation of the electrode rolling process for cylindrical 18650 lithium-ion cells using the finite-element method
Li-ion cells are the main technology for powering electric vehicles and power electronics nowadays. The number of produced cells is steadily increasing, and optimisation of current cell production is necessary to make the processes more effective. To fulfil this task, a detailed understanding of these production processes is vital. Digital twins and simulations can be […]
Optimizing the Aqueous Processing of Li4Ti5O12 Lithium-Ion Anodes
The aqueous processing of LTO into electrodes suffers of lithium leaching upon contact with water, leading to a rapid rise in slurry pH and the final corrosion of the aluminum current collector. The addition of acids can suppress the corrosion issue. Herein, we demonstrate that the amount of phosphoric acid (PA) and the ball-milling speed […]
Contacting of metallized polymer foils as current collectors with ultrasonic welding for Li-Ion batteries
Aluminum-polymer current collectors have the potential to increase the safety of Li-ion batteries by suppressing the extension of internal short circuits. Hence, the cell heats up only locally and for a limited time, which prevents a thermal runaway. However, in pouch cells the polymer layer electrically isolates the different plies from each other. This makes […]
Experimental characterization of 20 Ah lithium-ion pouch cells with blend cathode and parameterization of an equivalent circuit model
The electrochemical and transport processes within a lithium-ion battery lead to a non-linear and highly dynamic current/voltage behavior [1]. Understanding this behavior is a requirement for system design, operation control and state diagnosis. The combination of experiments and modeling allows a combined empirical and knowledge-based insight. We present the experimental characterization as well as the […]