Standardized Microstructure Analysis of a Cathode Material
This tutorial illustrates a common workflow to analyze the microstructure geometry of an imported data set. How to import this data set is shown in the first part of this tutorial series. The analysis of the geometry results in a better understanding of the structure and provides measurements to validate the statistical digital twin in the next part of the series.
We will detect binder within the solid phase, then we analyze the transport properties, such as tortuosity, the surface area, and the pore structure. In the end, we identify the individual grains with their statistics, enabling us to generate a statsitical digital twin as shown in the next part of this tutorial series.
This tutorial is the second part of the Digital Battery Design tutorial series:
Digital Battery Charging:Learn how to analyze the charging behavior of a digital battery consisting of bimodal electrodes.
Topics of this tutorial
Background Of The Sample
A real 3D-scan of an NMC cathode is used in this tutorial. Learn about it's origin.
Set-Up Your Tutorial Project
Detailed information about the tutorial contents and how to use this example tutorial is provided.
Visualization
How to display the structure with the colors and the visualization settings shown in this tutorial.
Chord Length Distribution
A Chord Length Distribution (CLD) is the distribution of the length of a typical chord of a structure. By being essentially unique for any given geometry class, it is a highly precise and sensitive measure to compare the geometries of porous media.
Identify Binder
The solid material in reality consists of several materials, which could not be distinguished from each other in the scan: NMC grains and a carbon black and binder domain.
Pore Size Distribution
Analyze the pore throats to get more information about the transport properties.
Surface Area
The surface area of the structure has significant meaning for the transport of Lithium ions between the active material and the electrolyte. The more surface the active material provides, the more possibilities for the ions to travel between the two materials exist.
Tortuosity
Compare transport properties of a structure and its optimization by computing the tortuosity, indicating the length of the necessary detours.
Grain Size Distribution
Analyze the solid volume percentage, shape, and diameter distribution of the grains in the microstructure. This information is needed to build a statistical digital twin.