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Preparation and Characterization of Composite Electrodes

Overview of composite battery fabrication and characterization
Figure: Marvin Cronau

Summary:

Lithium ion battery electrodes are composites consisting of active material particles for Li storage, binders, and conductive additives. In conventional lithium ion batteries, the pore space between these solid materials is filled with the liquid electrolyte. In the case of all-solid-state batteries, the pore space is filled with a solid electrolyte. The morphology of this pore space determines the Li+ ion transport properties and thus the ionic resistance of the electrode.

In the Roling research group, we fabricate lab-scale composite electrodes and characterize their ion transport properties by means of electrochemical impedance spectroscopy (EIS) and galvanostatic intermittent titration technique (GITT). In collaboration with the Tallarek research group, we investigate the morphology by means of focused ion beam scanning electron microscopy-based tomography (FIB-SEM tomography). The Tallarek group uses the physical reconstruction of the electrode for ion transport simulations.

Highlighted Publications:

  • M. Kroll, D. Hlushkou, S. Schlabach, A. Hötzel, B. Roling, U. Tallarek, 'Reconstruction-simulation approach verifies the impedance-derived ion transport tortuosity of a graphite battery electrode', J. Electrochem. Soc. 165 (2018) A3156-A3163. doi: 10.1149/2.0711813jes
  • N. Kaiser, S. Spannenberger, M. Schmitt, M. Cronau, Y. Kato, B. Roling, 'Ion transport limitations in all-solid-state lithium battery electrodes containing a sulfide-based electrolyte', J. Power Sources 396 (2018) 175-181. doi: 10.1016.j.jpowsour.2018.05.095
  • D. Hlushkou, A. E. Reising, N. Kaiser, S. Spannenberger, S. Schlabach, Y. Kato, B. Roling, U. Tallarek, 'The influence of void space on ion transport in a composite cathode for all-solid-state batteries', J. Power Sources 396 (2018) 363-370. doi: 10.1016.j.jpowsour.2018.06.041