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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 45: Emerging Topics in Chemical and Polymer Physics, New Instruments and Methods
CPP 45.8: Vortrag
Donnerstag, 30. März 2023, 11:30–11:45, ZEU 255
Aging-driven compositional changes in Li-ion batteries — •Dominik Petz1,2, Peter Müller-Buschbaum1,2, and Anatoliy Senyshyn1 — 1MLZ, TUM, Garching — 2TUM School of Natural Sciences, Chair of Functional Materials, Garching
Electrochemical cycling of lithium-ion batteries is supplemented by the active transport of lithium ions and electrons, which are exchanged between the cathode and anode material. Besides material properties, such exchange is facilitated by the parameters of electrochemical cell like electrode dimensions and geometry, current density, temperature, etc. Such parameters are neither uniformly distributed nor static in general and, therefore, serve as a factor stabilizing heterogeneous states in Li-ion batteries typically reflected in the lithium concentration profiles in the electrodes. Thus, cell aging directly affects the distribution of the lithium-ions in the graphite anode of 18650-type lithium-ion batteries. Lithium heterogeneities (often reflected in loss of lithium inventory) are directly related to the electrolyte filling level. In order to quantify and correlate them simultaneously, a set of cells at different state-of-health was studied non-destructively using spatially resolved neutron powder diffraction. Experimental results unambiguously revealed changes of the lithium and electrolyte distribution versus cell state-of-health in a series of commercial 18650-type lithium-ion battery.