.png){kind=icon}
.png){kind=icon}
Return
A Bilayer Cathode Design Procedure for Li Ion Batteries Using the Multilayer Doyle-Fuller-Newman Model (M-DFN)
.png){kind=icon}
PRE
AI
E
A
R
D
DOI：10.1149/1945-7111/ae6823.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
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.
Keywords:
lithium-ion
battery
multilayer Doyle-Fuller-Newman Model
M-DFN
optimisation
bilayer
fast charging
Journal
IF:
3.3
Papers:
3.3W
Citations:
9.4W
Organization
Cited Papers