scholarly journals Asymptotic Reduction of a Porous Electrode Model for Lithium-Ion Batteries

2019 ◽  
Vol 79 (4) ◽  
pp. 1528-1549 ◽  
Author(s):  
Iain R. Moyles ◽  
Matthew G. Hennessy ◽  
Timothy G. Myers ◽  
Brian R. Wetton
Keyword(s):  
Lithium Ion Batteries ◽  
Porous Electrode ◽  
Lithium Ion ◽  
Asymptotic Reduction ◽  
Porous Electrode Model

scholarly journals Multiscale modeling of lithium ion batteries: thermal aspects

2015 ◽  
Vol 6 ◽  
pp. 987-1007 ◽  
Author(s):  
Arnulf Latz ◽  
Jochen Zausch
Keyword(s):  
Thermal Behavior ◽  
Lithium Ion Batteries ◽  
Porous Electrode ◽  
Lithium Ion ◽  
Building Blocks ◽  
Heat Sources ◽  
Special Cases ◽  
Continuum Scale ◽  
Porous Electrode Model ◽  
The Continuum

The thermal behavior of lithium ion batteries has a huge impact on their lifetime and the initiation of degradation processes. The development of hot spots or large local overpotentials leading, e.g., to lithium metal deposition depends on material properties as well as on the nano- und microstructure of the electrodes. In recent years a theoretical structure emerges, which opens the possibility to establish a systematic modeling strategy from atomistic to continuum scale to capture and couple the relevant phenomena on each scale. We outline the building blocks for such a systematic approach and discuss in detail a rigorous approach for the continuum scale based on rational thermodynamics and homogenization theories. Our focus is on the development of a systematic thermodynamically consistent theory for thermal phenomena in batteries at the microstructure scale and at the cell scale. We discuss the importance of carefully defining the continuum fields for being able to compare seemingly different phenomenological theories and for obtaining rules to determine unknown parameters of the theory by experiments or lower-scale theories. The resulting continuum models for the microscopic and the cell scale are numerically solved in full 3D resolution. The complex very localized distributions of heat sources in a microstructure of a battery and the problems of mapping these localized sources on an averaged porous electrode model are discussed by comparing the detailed 3D microstructure-resolved simulations of the heat distribution with the result of the upscaled porous electrode model. It is shown, that not all heat sources that exist on the microstructure scale are represented in the averaged theory due to subtle cancellation effects of interface and bulk heat sources. Nevertheless, we find that in special cases the averaged thermal behavior can be captured very well by porous electrode theory.

scholarly journals Electrochemical Model-Based Investigation of Thick LiFePO4 Electrode Design Parameters

Modelling ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 259-287
Author(s):  
Robert Franke-Lang ◽  
Julia Kowal
Keyword(s):  
Lithium Ion Batteries ◽  
Porous Electrode ◽  
Lithium Ion ◽  
Size Composition ◽  
Design Parameters ◽  
Model Parameters ◽  
Electrode Structure ◽  
Transport Channel ◽  
Scale Particle ◽  
Electrochemical Model

The electrification of the powertrain requires enhanced performance of lithium-ion batteries, mainly in terms of energy and power density. They can be improved by optimising the positive electrode, i.e., by changing their size, composition or morphology. Thick electrodes increase the gravimetric energy density but generally have an inefficient performance. This work presents a 2D modelling approach for better understanding the design parameters of a thick LiFePO4 electrode based on the P2D model and discusses it with common literature values. With a superior macrostructure providing a vertical transport channel for lithium ions, a simple approach could be developed to find the best electrode structure in terms of macro- and microstructure for currents up to 4C. The thicker the electrode, the more important are the direct and valid transport paths within the entire porous electrode structure. On a smaller scale, particle size, binder content, porosity and tortuosity were identified as very impactful parameters, and they can all be attributed to the microstructure. Both in modelling and electrode optimisation of lithium-ion batteries, knowledge of the real microstructure is essential as the cross-validation of a cellular and lamellar freeze-casted electrode has shown. A procedure was presented that uses the parametric study when few model parameters are known.

scholarly journals Simulation for All-Solid State Batteries with Multi-Element Network Model

2021 ◽  
Vol 333 ◽  
pp. 17002
Author(s):  
Ryusei Hirate ◽  
Hiroki Mashioka ◽  
Shinichiro Yano ◽  
Yoshifumi Tsuge ◽  
Gen Inoue
Keyword(s):  
Lithium Ion Batteries ◽  
Performance Improvement ◽  
Layer Structure ◽  
Porous Electrode ◽  
Phase Interface ◽  
Lithium Ion ◽  
Interface Model ◽  
Electrode Structure ◽  
Electrode Layer ◽  
Solid State Batteries

In order to increase energy density and enhance safety, all-solid-sate lithium-ion batteries have been developed as a storage battery for electric vehicle (EV). Further performance improvement of all-solid-sate lithium-ion batteries requires optimization of the electrode structure. In this paper, we constructed a phase interface model focusing on the microstructure of the porous electrode, and examined the reaction of the electrode layer structure.

Sign in / Sign up

Export Citation Format

Share Document