Regensburg 2022 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Charged Soft Matter, Polyelectrolytes and Ionic Liquid

CPP 13.1: Hauptvortrag

Dienstag, 6. September 2022, 09:30–10:00, H38

Insights into degradation mechanisms in Li-based batteries and advantages of polymer coatings — •Neelima Paul — Heinz Maier-Leibnitz Zentrum (MLZ), TU München, Lichtenbergstr. 1, 85748 Garching, Germany

Lithium-ion batteries are present in portable electronics, electric vehicles and grid-scale energy storage and are an inherent part of our daily life. They offer high energy density, high power density, stable temperature performance, and are safe. However, they eventually suffer from capacity fade due to some intrinsic degradation mechanisms, and thus have a limited cycle life. To increase their lifetime, knowledge of the responsible degradation/aging mechanism is crucial and most beneficial if determined without destructive disassembly of the battery. I will demonstrate how parameters responsible for aging such loss of mobile Li inventory, active material degradation, metallic Li plating, can be monitored and quantified using both operando and post-mortem neutron techniques. Thereafter, I will describe the main degradation mechanism in Li-metal batteries and show how this can be overcome by applying viscoelastic polymer coatings with a specific mechanical strength to the anode surface.