In this section
@article{Daubner:2026:10.1149/ma2026-016649mtgabs,
author = {Daubner, S and Lagnoni, M and Kench, S and Rao, M and Bertei, A and Cooper, SJ},
doi = {10.1149/ma2026-016649mtgabs},
journal = {ECS Meeting Abstracts},
pages = {649--649},
title = {The Tortuosity of Graded Electrodes: Electrochemical Impedance and Microstructure-Aware Cell Models},
url = {http://dx.doi.org/10.1149/ma2026-016649mtgabs},
volume = {MA2026-01},
year = {2026}
}
TY - JOUR
AB - <jats:p>Microstructure design of battery electrodes is key to enable fast charge and higher capacity in next-generation lithium and sodium ion batteries. While porous-electrode (Doyle–Fuller–Newman-type) models capture the coupled transport–reaction physics governing cell performance, they typically treat the electrode as a homogenized medium and encode microstructure only through fitted, scalar “effective” parameters (e.g., Bruggeman-type tortuosity). This assumption is often adequate for uniform electrodes, but it breaks down for modern architectures with graded porosity, binder migration, bimodal particle distributions, or bilayer designs, where transport resistance is heterogeneous and reaction rates localize, leading to non-uniform utilization and premature rate limitations.</jats:p> <jats:p> Here we introduce an approach that efficiently bridges 3D image-based electrode simulations and microstructure-aware cell-scale modelling using volume-averaged microstructure descriptors. We compute spatially resolved, directional tortuosity factors <jats:italic>τ(x)</jats:italic> along with spatial porosity <jats:italic>ε(x)</jats:italic> and specific surface area <jats:italic>a(x)</jats:italic> and embed these closures directly into DFN-type cell models. This replaces ad hoc, globally fitted transport factors with architecture-dependent descriptors that can represent graded and bilayer electrodes in a physically interpretable way. We further show that common characterization and parameter-identification workflows implicitly assume electrode homogeneity, and can therefore misattribute microstructure-driven limitations to “material” kinetics when applied to structured electrodes. </jats:p>
AU - Daubner,S
AU - Lagnoni,M
AU - Kench,S
AU - Rao,M
AU - Bertei,A
AU - Cooper,SJ
DO - 10.1149/ma2026-016649mtgabs
EP - 649
PY - 2026///
SP - 649
TI - The Tortuosity of Graded Electrodes: Electrochemical Impedance and Microstructure-Aware Cell Models
T2 - ECS Meeting Abstracts
UR - http://dx.doi.org/10.1149/ma2026-016649mtgabs
UR - https://doi.org/10.1149/ma2026-016649mtgabs
VL - MA2026-01
ER -