A Bilayer Cathode Design Procedure for Li Ion Batteries Using the Multilayer Doyle-Fuller-Newman Model (M-DFN)

Journal article

Heterogeneities in lithium ion batteries can be significant factors in electrode under utilisation and degradation while charging. Bilayer electrodes have been proposed as a convenient and scalable way to homogenise the electrode response. In this paper, the design of a bilayer cathode for Li-ion batteries composed of separate layers of lithium nickel manganese cobalt oxide Li[Ni0.6Mn0.2Co0.2]O2 (NMC622) and lithium iron phosphate LiFePO4 (LFP) is optimised using the multilayer Doyle-Fuller-Newman (M-DFN) model. Changes to the carbon binder domain, electrolyte volume fraction, and tortuosity provided the greatest control for improving Li-ion charge mobility. The optimised bilayer design was able to charge at 3C between 0-90% SOC in 18.6 minutes, achieving 4.4 mAh cm−2. Comparing the optimal bilayer to the existing bilayer benchmark, an 8% increase in 3C charging capacity was achieved, along with 41% higher capacity compared to the LFP-only electrode. Through mechanistic physics-based modelling, it was shown that the 3C charging improvement of the optimised bilayer was achieved by enabling a more homogeneous current density distribution through the thickness of the electrode and electrolyte depletion prevention. The findings were confirmed on a high-fidelity X-ray computed tomography (CT) based microstructural model. The results illustrate how modelling can be used to rapidly search novel electrode designs and accelerate the deployment of fast-charging thick electrodes by adapting existing manufacturing processes.

Authors: Tredenick, EC; Boyce, AM; Drummond, R; Duncan, SR

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: IOP Publishing
• Journal: Journal of The Electrochemical Society
• Volume: 173
• Issue: 9
• Pages: 090530
• Article number: 090530
• Publication date: 2026-05-13
• DOI: 10.1149/1945-7111/ae6823
• EISSN: 1945-7111
• ISSN: 0013-4651
• Language: English
• Keywords: battery; bilayer; M-DFN; optimisation; lithium-ion; multilayer Doyle-Fuller-Newman Model; fast charging