1D Electrochemical Model for Lithium Ion Capacitors in Comsol

Madabattula, Ganesh; Wu, Billy; Marinescu, Monica; Offer, Gregory J.

doi:10.5281/zenodo.3569607

Cited by 2 publications

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“…Li diffusion/kinetics in LTO as a function of SOC would also help establish the reasons. The model file (.mph) available under an open-source license 26 would be useful in this direction. However, the qualitative conclusions drawn using the model in this work do not change.…”

Section: Resultsmentioning

confidence: 99%

“…The model framework developed here can be used for optimizing the power and energy performance of different designs of LICs. The model file (.mph) built in COMSOL is available under an open-source license agreement 26 for further development of LICs. 26 3.2 13.87 Projected area, cm 2 (A cell ) 6 1.13 1.13 1 C rate, mA/g 6 175 -Specific surface area, m 2 /g…”

Section: Discussionmentioning

confidence: 99%

“…The model file (.mph) built in COMSOL is available under an open-source license agreement 26 for further development of LICs. 26 3.2 13.87 Projected area, cm 2 (A cell ) 6 1.13 1.13 1 C rate, mA/g 6 175 -Specific surface area, m 2 /g…”

Section: Discussionmentioning

confidence: 99%

“…The ionic conductivity of the electrolyte as a function of the electrolyte concentration is given by κ = 1.147c 3 l − 22.38c 1.5 l + 29.15c l [26] The transference number as a function of the electrolyte concentration is given by…”

Section: Model Parameters-tablementioning

confidence: 99%

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How to Design Lithium Ion Capacitors: Modelling, Mass Ratio of Electrodes and Pre-lithiation

Madabattula

Marinescu

et al. 2019

J. Electrochem. Soc.

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Lithium ion capacitors (LICs) store energy using double layer capacitance at the positive electrode and intercalation at the negative electrode. LICs offer the optimum power and energy density with longer cycle life for applications requiring short pulses of high power. However, the effect of electrode balancing and pre-lithiation on usable energy is rarely studied. In this work, a set of guidelines for optimum design of LICs with activated carbon (AC) as positive electrode and lithium titanium oxide (LTO) as negative electrode was proposed. A physics-based model has been developed and used to study the relationship between usable energy at different effective C rates and the mass ratio of the electrodes. The model was validated against experimental data from literature. The model was then extended to analyze the need for pre-lithiation of LTO. The limits for pre-lithiation in LTO and use of negative polarization of the AC electrode to improve the cell capacity have been analyzed using the model. Furthermore, the model was used to relate the electrolyte depletion effects to poorer power performance in a cell with higher mass ratio. The open-source model can be re-parameterised for other LIC electrode combinations, and should be of interest to cell designers.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Model Parameters-tablementioning

confidence: 99%

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How to Design Lithium Ion Capacitors: Modelling, Mass Ratio of Electrodes and Pre-lithiation

Madabattula

Marinescu

et al. 2019

J. Electrochem. Soc.

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“…The 1D electrochemical model for a LIC based on Newman's porous electrode theory 6,[24][25][26][27] was taken from our previous work. 15,28 The model solves for potentials of the electrodes (f s ) and the electrolyte (f l ), the concentration of electrolyte (c l ) and the concentration of Li-ion in LTO particle (c s ), four variables in total. The 1D model geometry is represented in the schematic in Fig.…”

Section: Modelling and Simulation Detailsmentioning

confidence: 99%

Degradation Diagnostics for Li₄Ti₅O₁₂-Based Lithium Ion Capacitors: Insights from a Physics-Based Model

Madabattula

Marinescu

et al. 2020

J. Electrochem. Soc.

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Lithium ion capacitors are an important energy storage technology, providing the optimum combination of power, energy and cycle life for high power applications. However, there has been minimal work on understanding how they degrade and how this should influence their design. In this work, a 1D electrochemical model of a lithium ion capacitor with activated carbon (AC) as the positive electrode and lithium titanium oxide (LTO) as the negative electrode is used to simulate the consequences of different degradation mechanisms in order to explore how the capacity ratio of the two electrodes affects degradation. The model is used to identify and differentiate capacity loss due to loss of active material (LAM) in the lithiated and de-lithiated state and loss of lithium inventory (LLI). The model shows that, with lower capacity ratios (AC/LTO), LAM in the de-lithiated state cannot be identified as the excess LTO in the cell balances the capacity loss. Cells with balanced electrode capacity ratios are therefore necessary to differentiate LAM in lithiated and de-lithiated states and LLI from each other. We also propose in situ diagnostic techniques which will be useful to optimize a LIC’s design. The model, built in COMSOL, is available online.

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1D Electrochemical Model for Lithium Ion Capacitors in Comsol

Cited by 2 publications

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How to Design Lithium Ion Capacitors: Modelling, Mass Ratio of Electrodes and Pre-lithiation

How to Design Lithium Ion Capacitors: Modelling, Mass Ratio of Electrodes and Pre-lithiation

Degradation Diagnostics for Li₄Ti₅O₁₂-Based Lithium Ion Capacitors: Insights from a Physics-Based Model

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1D Electrochemical Model for Lithium Ion Capacitors in Comsol

Cited by 2 publications

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How to Design Lithium Ion Capacitors: Modelling, Mass Ratio of Electrodes and Pre-lithiation

How to Design Lithium Ion Capacitors: Modelling, Mass Ratio of Electrodes and Pre-lithiation

Degradation Diagnostics for Li4Ti5O12-Based Lithium Ion Capacitors: Insights from a Physics-Based Model

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Degradation Diagnostics for Li₄Ti₅O₁₂-Based Lithium Ion Capacitors: Insights from a Physics-Based Model