Evaluating the determination of solid-phase diffusion and reaction-rate constant for Li-ion batteries

Journal of Energy Storage, vol. 132, pp. 117628

Abstract

Physics-based models are important tools for improving Li-ion battery performance, with their accuracy heavily dependent on key parameters such as the solid-phase diffusion coefficient ( D s ) and reaction-rate constant ( k 0 ). In this work, galvanostatic intermittent titration technique (GITT) and potentiostatic intermittent titration technique (PITT) measurements were conducted on half-cells with a LiNi 0.4 Co 0.6 O 2 (NC46) electrode from a commercial battery. D s and k 0 were determined using Weppner and Huggins' 1977 analytical method and physics-based optimization with the DFN model. These parameters were then implemented into the DFN model and validated under constant current with varying current densities and dynamic cycles. The combination of GITT measurements with the DFN model achieved the highest accuracy (average RMSE of 12.6 mV), while the analytical approach showed lower accuracy, especially with GITT measurements (average RMSE of 53.7 mV). Findings indicate that the widely used analytical approach in combination with GITT measurements may be unsuitable for accurately estimating D s and k 0 due to inherent limitations and assumptions, as demonstrated here for the NC46 material. The proposed DFN model approach in combination with GITT measurements demonstrated high accuracy and versatility in determining D s and k 0 across all lithiation levels. A sensitivity analysis further revealed that using the initial relaxation region of the GITT pulse is optimal for estimating D s with the analytical approach.

Authors 7

1. Haider Adel Ali Ali Aachen Institute of Physical Chemistry

   Forschungszentrum Jülich · RWTH Aachen University

   Affiliation as printed

   Forschungszentrum Jülich GmbH, Institute of Energy Technologies (IET-1), Wilhelm-Johnen-Straße, 52428 Jülich, Germany

   RWTH Aachen University, Institute of Physical Chemistry, Landoltweg 2, 52074 Aachen, Germany

2. Luc H.J. Raijmakers corresponding

   Forschungszentrum Jülich

   Affiliation as printed

   Forschungszentrum Jülich GmbH, Institute of Energy Technologies (IET-1), Wilhelm-Johnen-Straße, 52428 Jülich, Germany

3. Anna Windmüller

   Forschungszentrum Jülich

   Affiliation as printed

   Forschungszentrum Jülich GmbH, Institute of Energy Technologies (IET-1), Wilhelm-Johnen-Straße, 52428 Jülich, Germany

4. Hermann Tempel

   Forschungszentrum Jülich

   Affiliation as printed

   Forschungszentrum Jülich GmbH, Institute of Energy Technologies (IET-1), Wilhelm-Johnen-Straße, 52428 Jülich, Germany

5. Bor Yann Liaw

   Forschungszentrum Jülich

   Affiliation as printed

   Forschungszentrum Jülich GmbH, Institute of Energy Technologies (IET-1), Wilhelm-Johnen-Straße, 52428 Jülich, Germany

   High Power Research Laboratory, LLC, Idaho Falls, ID 83404, USA

6. Peter H. L. Notten

   University of Technology Sydney · Forschungszentrum Jülich · Eindhoven University of Technology

   Affiliation as printed

   Centre for Clean Energy Technology, University of Technology Sydney, Broadway, Sydney, NSW 2007, Australia

   Eindhoven University of Technology, P.O. Box 513, Eindhoven 5600 MB, the Netherlands

   Forschungszentrum Jülich GmbH, Institute of Energy Technologies (IET-1), Wilhelm-Johnen-Straße, 52428 Jülich, Germany

7. Rüdiger‐A. Eichel Aachen Institute of Physical Chemistry

   Forschungszentrum Jülich · RWTH Aachen University

   Affiliation as printed

   Forschungszentrum Jülich GmbH, Institute of Energy Technologies (IET-1), Wilhelm-Johnen-Straße, 52428 Jülich, Germany

   RWTH Aachen University, Institute of Physical Chemistry, Landoltweg 2, 52074 Aachen, Germany