Microstructure Effects on Conductive Pathways in Polymer and Hybrid All-Solid-State Electrodes
All-Solid-State Electrodes as part of the next generation of batteries promise increased energy densities, fast charging properties and higher safety compared to traditional liquid-based systems. In order to promote ionic and electric conductivity 3D-structured and graded composite cathodes from composite particles are intended. These particles consist of active material, electrolyte and conductive additive and have […]
Investigation and Application of Sensor Integration in Lithium-Ion Battery Cells
Lithium-ion batteries are indispensable in the automotive sector as energy storage devices due to their energy and power density. With increasing energy contents of automotive battery systems, enabling greater ranges for the vehicles, safety requirements become an even more important aspect. However, present condition monitoring of lithium-ion batteries is limited to current, voltage and temperature […]
Electrode Laserbased Structuring
In order to meet the increasing requirements for lithium ion batteries to electrify the individual mobility, a high specific discharge capacity and a sufficient C-rate capability at the same time is mandatory. A promising strategy to reach these requirements is the use of high energy electrodes based on high mass loading, which results in a […]
Estimation of apparent diffusion coefficients in positive lithium-ion battery electrodes by optical in situ observation
Lithium-ion batteries face increasing demands from different applications. Therefore, further improvement of current lithium-ion battery technology is still desirable. Immediate metrological methods that work in a complementary way to previous methods are advantageous for the research and development process. Within this context, we present facile and quick optical in-situ video microscopy investigations of lithium iron […]
External and Local Short-Circuit Scenarios Applied to Silicon-Graphite/Nickel-Rich Pouch-Type Lithium-Ion Batteries
Higher capacitive active materials, thicker electrode coatings, and/or overall larger sized cells are current trends to increase the energy density in lithium-ion cells. Thereby, safe operation over a long battery lifetime needs to be maintained or even improved. Regarding safety incidents, short-circuits are often the cause for critical states leading to irreversible cell damage or […]
Modelling ageing of NCA-type Li-ion batteries: From half cells to complete batteries
With the increasing applications of Li-ion batteries (LIB) in electrical vehicles, the state-of-health (SoH) awareness nowadays is of great significance and plays an important role in avoiding safety issues. Mathematical models are considerably used in this aspect due to their real-time response, high accuracy and low cost. In the present poster, a pseudo-two-dimensional (P2D) model […]
Correlative inspection technologies from the macroscopic to nanoscopic scale for the understanding of performance loss in Li-Ion batteries
The following investigations were performed on commercial available graphite/NMC (Li [Co1/3Ni1/3Mn1/3] O2) pouch cells[1]. Non-destructive Computer Tomography (CT) yields a thickness increment of the treated cells. Fig. 1 shows SEM images of cathode, separator foils in top-view and anode foil in top and cross-sectional view (SEM/FIB). The cathode foils consist of NMC active material particles […]
Correlative inspection technologies from the macroscopic to nanoscopic scale for the understanding of performance loss in Li-Ion batteries
The following investigations were performed on commercial available graphite/NMC (Li [Co1/3Ni1/3Mn1/3] O2) pouch cells[1]. Non-destructive Computer Tomography (CT) yields a thickness increment of the treated cells. Fig. 1 shows SEM images of cathode, separator foils in top-view and anode foil in top and cross-sectional view (SEM/FIB). The cathode foils consist of NMC active material particles […]
Ni-rich cathode nanomaterials with enhanced exposed Li-ion diffusion pathways for Li-ion batteries
As one of the Li-ion batteries‘ most promising cathode materials, Ni-rich layered transition-metal-mixed oxide LiNixCoyMn1-x-yO2 (NCM, x>0.5) has drawn intense attention in the search for high energy density, low cost, and reduced Co content materials. However, Ni-rich NCM cathodes are still suffering from several drawbacks. Cation disorder and volume expansion during Li-ion (de)intercalation are mainly […]
Influence of conductivity additives and their distribution on the performance properties of lithium-ion batteries
A lithium ion battery (LIB) cathode comprises three major components: an active material, an electrical conductivity additive and a binder. The composite combination of binder and electrical conductivity additive, the carbon binder domain (CBD) is electrochemically inert. Preparation of a LIB cathode strongly influences the dispersion of the above-mentioned constituents leading to the formation of […]