Regensburg 2010 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 58: Topical Session Battery Materials IV

MM 58.2: Vortrag

Donnerstag, 25. März 2010, 16:15–16:30, H6

Microscaopic investigation of Li-Ion Batteries and Quantitative Characterization of the Microstructure — •Carmen Hafner, Timo Bernthaler, Alwin Nagel, and Gerhard Schneider — Aalen University, Department Materials Science and Surface Engineering, Aalen, Germany

Lithium ion batteries are the most attractive candidates for mobile applications. The function of Li ion batteries is based on the change of active materials due to diffusion processes. Electrochemical and physical characterization techniques are well advanced and published. Unlike these techniques the microscopic visualization and quantification of the microstructure of the electrode materials are not state of the art. Cell performance and aging mechanisms depend strongly on the appearance and changes in the microstructure. Hence, the investigation and quantification of microstructures is of increasing importance for the understanding of battery materials. We present the potential of the combined microscopic techniques nano 3D-computed tomography, optical microscopy, scanning electron microscopy and image analysis to characterize cell designs and the microstructure of active materials. The process how to prepare and investigate Li ion batteries by these techniques will be described. For the measurement of specific microstructural features of the active materials methods of the quantitative microstructure analysis will be explained. Parameters like volume fraction of phases, homogeneity, pores, cracks, grain size and shape distribution and specific surfaces and interfaces will be discussed.