Erlangen 2018 – wissenschaftliches Programm

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AKE: Arbeitskreis Energie

AKE 8: Energy for Mobility - High Performance Batteries for Vehicles and Clean(er) Marine Transport

AKE 8.1: Hauptvortrag

Dienstag, 6. März 2018, 16:15–16:45, RW HS

Performance analysis of Lithium-ion-batteries: status and prospects — •Ellen Ivers-Tiffée, Philipp Braun, and Michael Weiss — Institute for Applied Materials (IAM-WET), Karlsruhe Institute of Technology (KIT), D 76131 Karlsruhe, Germany

The electrode microstructure, i.e., the distribution of active material, carbon black, and pore phase, as well as surface area and tortuosity strongly affects the overall performance of Lithium-ion-batteries. Contributions by ohmic resistance R₀, contact resistance R_CC, charge transfer resistance R_CT and solid-state diffusion resistance R_Diff, which all occur with different time constants, have been quantified for various state-of-the-art Lithium-ion-batteries by a combination of (i) electrochemical impedance spectroscopy measurements (EIS) with (ii) time-domain measurements (TDM).

A newly developed one-dimensional model for Lithium-ion batteries is presented, which simulates battery performance by linking two phase transmission line models for both electrodes with an ohmic resistance for the liquid electrolyte. Variations of (i) electrical parameters, i.e. ionic and electronic conductivity, (ii) electrochemical parameters, i.e. charge transfer resistance and solid-state diffusion, and, (iii) microstructure parameters, i.e. phase tortuosity and electrode thickness, indicate the most important material and design parameters for high-performance batteries.