Regensburg 2019 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 26: Materials for Energy Storage and Conversion

MM 26.5: Vortrag

Mittwoch, 3. April 2019, 16:00–16:15, H43

Investigation of micro batteries containing single secondary particles of Li(Ni_1−x−yCo_xMn_y)O₂ as cathode material — •Markus Sebastian Friedrich^1,2, Simon Burkhardt^1,2, Matthias Thomas Elm^1,2,3, and Peter Jens Klar^1,2 — ¹Institute of Experimental Physics I, Heinrich-Buff-Ring 16, 35392 Giessen — ²Center for Materials Research (LaMa/ZfM), Heinrich-Buff-Ring 16, 35392 Giessen — ³Institute of Physical Chemistry, Heinrich-Buff-Ring 17, 35392 Giessen

Lithium ion batteries (LIBs) are todays state-of-the-art power supplies for portable electronic devices as well as for electrical and hybrid vehicles. To optimize such battery systems, a deeper understanding of the transport in the active material used in the electrodes of LIBs is essential. Typically layered structured transition metal oxides, such as Li(Ni_1−x−yCo_xMn_y)O₂ (NCM), are used as cathode active materials. Conventionally, for investigation, micrometer sized secondary particles of the active material, built from a complex porous network of nanometer sized single crystalline primary particles, are incorporated in to composite electrodes, which contain additives that might influence or superpose the properties of the pure active material.

We developed a technique to assemble micro batteries that contain single secondary particles of NCM and performed electrochemical measurements on such cell systems. In the course of these investigations, we found clear evidence that the transport in the active material particles depends on the secondary particle diameter and, therefore, depends on the porous primary particle network.