Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MM: Fachverband Metall- und Materialphysik

MM 2: Battery Materials

MM 2.3: Vortrag

Montag, 12. März 2018, 10:45–11:00, H 0106

Pressure-dependence of the contact resistance in transport measurements of single secondary particles of Li(Ni_xCo_yMn_1−x−y)O₂ — •Markus S. Friedrich¹, Janis K. Eckhardt¹, Simon Burkhardt^1,2, Limei Chen^1,2, Matthias T. Elm^1,2,3, and Peter J. Klar^1,2 — ¹Institute of Experimental Physics I, Heinrich-Buff-Ring 16, 35392 Gießen, Germany — ²Center for Materials Research (LaMa), Heinrich-Buff-Ring 16, 35392 Gießen, Germany — ³Institute of Physical Chemistry, Heinrich-Buff-Ring 17, 35392 Gießen, Germany

Lithium ion intercalating and deintercalating layered structured transition metal oxides, such as Li(Ni_xCo_yMn_1−x−y)O₂ (NCM), are of interest for applications in lithium-ion batteries due to the predicted high capacity and the high cycling stability. Most studies on these materials were carried out using composite electrodes which not only contained the active electrode material, but also additives that significantly influence the electrochemical properties of the electrode. A deeper understanding of the intrinsic properties of the active particles is needed, to examine the influence of the electrode-materials structure on energy storage and conversion of the cell system the material is used in. We developed a technique which allowed us to contact single particles of pure NCM with a controlled pressure and to perform electrochemical impedance spectroscopy to gain information about the electronic transport properties of the material. To contact the particles, they were arranged in trap holes, formed by photolithographical structuring of a photoresist, on top of a noble metal coated substrate.