Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MM: Fachverband Metall- und Materialphysik
MM 27: Poster Session I
MM 27.18: Poster
Dienstag, 13. März 2018, 18:30–19:45, Poster E
Examination of the partial electronic conductivity of mixed ionic and electronic conducting secondary particles — •Janis K. Eckhardt1, Markus S. Friedrich1, Simon Burkhardt1,2, Limei Chen1,2, Matthias T. Elm1,2,3, and Peter J. Klar1,2 — 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 batteries are widely used as power source in portable electrical applications. In particular with regard to optimization of existing applications or development of new technologies, it is necessary to understand the fundamentals of ionic and electronic transport inside the active cathode material. Most scientists are examining cathode materials by using composite electrodes which also contain additives influencing their electrochemical properties. To avoid such influences it is desirable to investigate the electrochemical properties of the pure active material. By using a specially designed electrochemical cell we performed electrochemical impedance spectroscopy and cyclic voltammetry measurements on single Li(Ni1/3Co1/3Mn1/3)O2 (NCM-111) secondary particles to gather information about their partial electronic conductivity. A cell arrangement that was suppressing the ionic current as a response to an external voltage signal was realized by making use of ion blocking metal electrodes. The results imply a correlation between the total resistance and diameter of the secondary particle, which was used to estimate the electronic partial conductivity.