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MM: Fachverband Metall- und Materialphysik

MM 52: Materials for Energy Storage and Conversion - Ion Diffusion

MM 52.4: Vortrag

Donnerstag, 19. März 2020, 11:00–11:15, IFW D

Measurements of lithium-ion conductivity at the grain level — •Peihua Huang, Patrick Uredat, Julian Zahnow, and Matthias T. Elm — Center for Materials Research, Justus-Liebig-University Gießen, Germany, Heinrich-Buff-Ring 16, 35392 Gießen

Although lithium ion batteries (LIBs) have been commercialized since last century, there is still potential to improve the overall cell performance. One possibility for improvement is the optimization of the cathode of a LIB, where secondary particles of the active material are embedded in a conducting agent and binder material. The secondary particles themselves have a complex architecture consisting of primary particles in the nanoscale. As the microstructure has a strong influence on the transport properties, the characterization of the grain boundaries themselves is desirable. To study the transport across a grain boundary, thin layers of lithium cobalt oxide were deposited under various conditions by pulsed laser deposition. The films were subsequently annealed at various temperatures to facilitate grain growth to the micrometer range. Efforts on contacting single grain with microfabrication techniques have been made in order to study the lithium ion transport behavior at the grain level. For comparison, also the lithium ionic conductivity of the thin films has been measured.