Lithium-Ion Battery Secondary Pore Network Design Optimization Analytical Diffusion Model

Use the Lithium-Ion Battery Secondary Pore Network (SPN) Design Optimization Analytical Diffusion Model to improve battery performance and enable fast charging.

The model quantifies the impact of SPN, also called dual-pore network, on electrolyte ionic diffusion considering various pore channel geometries. It compares reference (i.e., without SPN) and structured (i.e., with SPN) electrodes at identical gravimetric and volumetric specific theoretical capacity. It also provides optimal design parameters according to different optimization objectives, all aimed to balance the improved structured electrode through-plane diffusion with the degraded porous matrix in-plane diffusion.

The model requires MATLAB (tested with 2019b version) with no additional toolbox. The MATLAB live editor hides code, leaving visible only text, equations, figures, and results. View a screenshot of the model interface.

$Two-dimensional representation of a structured electrode with a so-called secondary pore network. The electrode has a rectangular shape, divided into different regions. The primary region contains pore in grey, active material in blue, and additive noted carbon binder domain in green. Secondary region contains only pore in light pink. Separator used to avoid contact between anode and cathode is represented in magenta at the top. Current collector is represented in orange. Lithium ion diffusion path is represented in red arrows, with larger arrows within the secondary region. The different parameters noted in the figure are w, for the region width, L for the electrode thickness, and epsilon for the different volume fractions of pore, active material and carbon binder domain. Below the reference electrode on the right side, the system of axis is indicated, with a vertical line for the through-plane direction, and an horizontal line for the in-plane direction.$

$A reference electrode without secondary pore network. The electrode has a rectangular shape, divided into different regions. The primary region contains pore in grey, active material in blue, and additive noted carbon binder domain in green. Secondary region contains only pore in light pink. Separator used to avoid contact between anode and cathode is represented in magenta at the top. Current collector is represented in orange. Lithium ion diffusion path is represented in red arrows, with larger arrows within the secondary region. The different parameters noted in the figure are w, for the region width, L for the electrode thickness, and epsilon for the different volume fractions of pore, active material and carbon binder domain. Below the reference electrode on the right side, the system of axis is indicated, with a vertical line for the through-plane direction, and an horizontal line for the in-plane direction.$

(Left) Schematic representation of a structured electrode with secondary pore network, and (right) a reference (or baseline) electrode.

Model Download Instructions

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How To Use the Model

Watch this tutorial video to learn how to use the model.

Text version

Publications

Enabling Fast Charging of Lithium-Ion Batteries through Secondary-/Dual-Pore Network: Part I - Analytical Diffusion Model, Electrochimica Acta (2020)

Enabling Fast Charging of Lithium-Ion Batteries through Secondary-/Dual-Pore Network: Part II - Numerical Model, Electrochimica Acta (2020)

Battery Scientist

Francois.UsseglioViretta@nrel.gov
303-275-4437