Robert Timms
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View article: Physics-Based Battery Model Parametrisation from Impedance Data
Physics-Based Battery Model Parametrisation from Impedance Data Open
Non-invasive parametrisation of physics-based battery models can be performed by fitting the model to electrochemical impedance spectroscopy (EIS) data containing features related to the different physical processes. However, this requires…
View article: Physics-based battery model parametrisation from impedance data
Physics-based battery model parametrisation from impedance data Open
Non-invasive parametrisation of physics-based battery models can be performed by fitting the model to electrochemical impedance spectroscopy (EIS) data containing features related to the different physical processes. However, this requires…
View article: Is silicon worth it? Modelling degradation in composite silicon–graphite lithium-ion battery electrodes
Is silicon worth it? Modelling degradation in composite silicon–graphite lithium-ion battery electrodes Open
The addition of silicon into graphite lithium-ion battery anodes has the potential to increase cell energy density. However, understanding the complex degradation behaviour in these composite systems remains a research challenge. Here, we …
View article: Coupled electrochemical-thermal-mechanical stress modelling in composite silicon/graphite lithium-ion battery electrodes
Coupled electrochemical-thermal-mechanical stress modelling in composite silicon/graphite lithium-ion battery electrodes Open
View article: A mechanical model for reinforced, expanding spirally-wound layered materials
A mechanical model for reinforced, expanding spirally-wound layered materials Open
View article: Coupled Electrochemical-Thermal-Mechanical Stress Modelling in Composite Silicon/Graphite Lithium-Ion Battery Electrodes
Coupled Electrochemical-Thermal-Mechanical Stress Modelling in Composite Silicon/Graphite Lithium-Ion Battery Electrodes Open
View article: A continuum of physics-based lithium-ion battery models reviewed
A continuum of physics-based lithium-ion battery models reviewed Open
Physics-based electrochemical battery models derived from porous electrode theory are a very powerful tool for understanding lithium-ion batteries, as well as for improving their design and management. Different model fidelity, and thus mo…
View article: A Continuum of Physics-Based Lithium-Ion Battery Models Reviewed
A Continuum of Physics-Based Lithium-Ion Battery Models Reviewed Open
Physics-based electrochemical battery models derived from porous electrode theory are a very powerful tool for understanding lithium-ion batteries, as well as for improving their design and management. Different model fidelity, and thus mo…
View article: liionpack: A Python package for simulating packs of batteries with PyBaMM
liionpack: A Python package for simulating packs of batteries with PyBaMM Open
Electrification of transport and other energy intensive activities is of growing importance as it provides an underpinning method to reduce carbon emissions. With an increase in reliance on renewable sources of energy and a reduction in th…
View article: Lithium-ion battery degradation: how to model it
Lithium-ion battery degradation: how to model it Open
In this paper, the first physics-based model including direct links between four degradation mechanisms in the negative electrode is reported.
View article: A Minimal Information Set To Enable Verifiable Theoretical Battery Research
A Minimal Information Set To Enable Verifiable Theoretical Battery Research Open
Batteries are an enabling technology for addressing sustainability through the electrification of various forms of transportation (1) and grid storage. (2) Batteries are truly multi-scale, multi-physics devices, and accordingly various the…
View article: Python Battery Mathematical Modelling (PyBaMM)
Python Battery Mathematical Modelling (PyBaMM) Open
As the UK battery modelling community grows, there is a clear need for software that uses modern software engineering techniques to facilitate cross-institutional collaboration and democratise research progress. The Python package PyBaMM a…
View article: Asymptotic Reduction of a Lithium-Ion Pouch Cell Model
Asymptotic Reduction of a Lithium-Ion Pouch Cell Model Open
A three-dimensional model of a single-layer lithium-ion pouch cell is presented which couples conventional porous electrode theory describing cell electrochemical behaviour with an energy balance describing cell thermal behaviour. Asymptot…
View article: Communication—Prediction of Thermal Issues for Larger Format 4680 Cylindrical Cells and Their Mitigation with Enhanced Current Collection
Communication—Prediction of Thermal Issues for Larger Format 4680 Cylindrical Cells and Their Mitigation with Enhanced Current Collection Open
The paper numerically explores the electrochemical and thermal behaviour of a larger format 4680 cylindrical cell recently proposed by Tesla and explains the need to go “tabless.” An idealized spiral geometry is used for 2D simulations wit…
View article: Homogenisation of spirally-wound high-contrast layered materials
Homogenisation of spirally-wound high-contrast layered materials Open
Asymptotic homogenisation is used to systematically derive reduced-order macroscopic models of conductive behaviour in spirally-wound layered materials in which the layers have very different conductivities. The problem is motivated by the…
View article: A Suite of Reduced-Order Models of a Single-Layer Lithium-Ion Pouch Cell
A Suite of Reduced-Order Models of a Single-Layer Lithium-Ion Pouch Cell Open
For many practical applications, fully coupled three-dimensional models describing the behaviour of lithium-ion pouch cells are too computationally expensive. However, owing to the small aspect ratio of typical pouch cell designs, such mod…
View article: pybamm-team/PyBaMM: v0.2.3
pybamm-team/PyBaMM: v0.2.3 Open
This release enables the use of Google Colab for running example notebooks, and adds some small new features and bug fixes. See CHANGELOG for more details.
View article: Corrigendum to “Generalised single particle models for high-rate operation of graded lithium-ion electrodes: Systematic derivation and validation” [Electrochimica Acta 339 (2020) 135862]
Corrigendum to “Generalised single particle models for high-rate operation of graded lithium-ion electrodes: Systematic derivation and validation” [Electrochimica Acta 339 (2020) 135862] Open
View article: Python Battery Mathematical Modelling (PyBaMM)
Python Battery Mathematical Modelling (PyBaMM) Open
As the UK battery modelling community grows, there is a clear need for software that uses modern software engineering techniques to facilitate cross-institutional collaboration and democratise research progress. The Python package PyBaMM a…
View article: WITHDRAWN
WITHDRAWN Open
As the UK battery modelling community grows, there is a clear need for software that uses modern software engineering techniques to facilitate cross-institutional collaboration and democratise research progress. The Python package PyBaMM a…
View article: Probing Heterogeneity in Li-Ion Batteries with Coupled Multiscale Models of Electrochemistry and Thermal Transport using Tomographic Domains
Probing Heterogeneity in Li-Ion Batteries with Coupled Multiscale Models of Electrochemistry and Thermal Transport using Tomographic Domains Open
This work presents a methodology for coupling two open-source modelling frameworks in a highly parallel fashion across multiple length scales to solve an electrical current and heat transport problem for commercial cylindrical lithium-ion …
View article: A boundary layer analysis for the initiation of reactive shear bands
A boundary layer analysis for the initiation of reactive shear bands Open
A one-dimensional model for the initiation of shear bands in a reactive material is developed, which accounts for thermal softening, strain hardening and strain-rate effects, and models the chemical reaction using an Arrhenius source term.…
View article: An Asymptotic Derivation of a Single Particle Model with Electrolyte
An Asymptotic Derivation of a Single Particle Model with Electrolyte Open
The standard continuum model of a lithium-ion battery, the Doyle-Fuller-Newman (DFN) model, is computationally expensive to solve. Typically simpler models, such as the single particle model (SPM), are used to provide insight for control p…
View article: Mathematical modelling and investigation of explosive pinch, friction and shear problems
Mathematical modelling and investigation of explosive pinch, friction and shear problems Open
The mechanisms which lead to the accidental ignition of explosive materials in response to low energy stimuli are still not well understood. It is widely agreed that localised regions of increased temperature, so-called `hot spots', are re…
View article: Shear localisation during deformation of reactive thermo-visco-elastic-plastic materials
Shear localisation during deformation of reactive thermo-visco-elastic-plastic materials Open
A one-dimensional model for the initiation of shear bands in a reactive material is developed, with an Arrhenius source term to model the chemical reaction occurring in the band. An inhomogeneity in the heat flux is used as the stimulus fo…
View article: A Two-Dimensional Model for Melting and Ignition of a Thin Sheared Viscous Layer
A Two-Dimensional Model for Melting and Ignition of a Thin Sheared Viscous Layer Open
View article: Modelling the effects of temperature-dependent material properties in shear melt layers
Modelling the effects of temperature-dependent material properties in shear melt layers Open
Technical paper presented at the 2016 Defence and Security Doctoral Symposium. This paper won second place in the Technical Paper category.The mechanisms responsible for ignition of explosive materials in response to low energy stimuli, kn…