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ENTFÄLLT: Kolloquium "Designing All-Solid-State-Batteries: a Model Approach"

Prof. Dr. Ellen Ivers-Tiffée / Karlsruhe Institute of Technology, Institute for Applied Materials

15.02.2018 14:00 Uhr
15.02.2018 15:30 Uhr
Forschungszentrum Jülich, Großer Hörsaal der Zentralbibliothek (Geb. 04.7.)

---Dieser Vortrag entfällt leider.---

Im Rahmen der Kolloquiumsreihe "Energie und Klima" referiert Prof. Dr. Ellen Ivers-Tiffée (KIT) zu Festkörperbatterien. Der Vortrag ist in englischer Sprache, der Eintritt ist frei.

All-solid-state lithium-ion batteries (SLiBs) are considered as promising next generation energy storage systems. A model might be very useful, which enables to assess (i) whether a SLiB can be competitive to state-of-the-art Li-ion batteries, (ii) helps to identify the dominant loss mechanisms in a SLiB and (iii) enables to systematically optimize a SLiB design for special user applications.

Solid-state batteries operate with solid electrolytes based on oxides, sulfides or phosphates. Likewise, attention needs to be directed towards improved solid electrolytes, both with respect to ion conductivity and stability. Interface reactions with electrodes during processing and their impact on electrochemical performance are critical. In this context, the assessment of solid electrolytes, electrode materials, solid electrolyte/electrode interfaces and three-dimensional composite electrodes becomes key.

A newly developed one-dimensional model for SLiBs is presented, based on a design concept with composite electrodes. The expected performance is simulated by linking two phase transmission line models for composite electrodes with an ohmic resistance representing the solid electrolyte (separator). Variations of (i) electrical parameters, i.e. ionic and electronic conductivity, (ii) electrochemical parameters, i.e. charge transfer resistance and solid state diffusion of lithium, and, (iii) microstructure parameters, i.e. phase tortuosity and composite electrode thickness, indicate the most important material and design parameters for high-performance batteries. Finally SLiB architectures based on sulfide and oxide electrolytes will be discussed, which potentially raise the energy density above 400Wh/kg. However, many more reliable studies on SLiB materials, interfaces and cell performance are necessary to increase the accuracy of the simulation results.