Characterization of carbon felt electrodes for vanadium redox flow batteries – A pore network modeling approach

Banerjee, Rupak; Bevilacqua, Nico; Eifert, László; Zeis, Roswitha

doi:10.1016/j.est.2018.11.014

Cited by 62 publications

(40 citation statements)

References 52 publications

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“…The electrode thickness also plays a significant role in the electrochemical performance [23] and the pressure drop in the cell [24], which can be modulated by abutting multiple single electrode layers. Finally, studies in the electrode porosity and permeability reveal connections to the peak power [25], accessible energy density [26], energy efficiency [26][27][28][29], and fluid dynamics [30]. In whole, electrode modifications continue to be a targeted research area to improve the overall VRFB electrochemical performance [22,27,[31][32][33][34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Data-driven electrode parameter identification for vanadium redox flow batteries through experimental and numerical methods

et al. 2020

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The vanadium redox flow battery (VRFB) is a promising energy storage technology for stationary applications (e.g., renewables integration) that offers a pathway to cost-effectiveness through independent scaling of power and energy as well as longevity. Many current research efforts are focused on improving battery performance through electrode modifications, but high-throughput, laboratory-scale testing can be time-and material-intensive. Advances in multiphysics-based numerical modeling and data-driven parameter identification afford a computational platform to expand the design space by rapidly screening a diverse array of electrode configurations. Herein, a 3D VRFB model is first developed and validated against experimental results. Subsequently, a new 2D model is composed, yielding a computationally-light simulation framework, which is used to span bounded values of the electrode thickness, porosity, volumetric area, fiber diameter, and kinetic rate constant across six cell polarization voltages. This generates a dataset of 7350 electrode property combinations for each cell voltage, which is used to evaluate the effect of these structural properties on the pressure drop and current density. These structure-performance relationships are further quantified using Kendall τ rank correlation coefficients to highlight the dependence of cell performance on bulk electrode morphology and to identify improved property sets. This statistical framework may serve as a general guideline for parameter identification for more advanced electrode designs and redox flow battery (RFB) stacks.

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Section: Introductionmentioning

confidence: 99%

Data-driven electrode parameter identification for vanadium redox flow batteries through experimental and numerical methods

et al. 2020

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“…The electrode thickness also plays a significant role in the electrochemical performance [22] and the pressure drop in the cell [23], which can be modulated by abutting multiple single electrode layers. Finally, studies in the electrode porosity and permeability reveal connections to the peak power [24], accessible energy density [25], energy efficiency [25][26][27][28], and fluid dynamics [29]. Indeed, the electrode structure-performance relationship can be elucidated with systematic experimental analyses; however, these campaigns can be time-, labor-, and resource-intensive.…”

Section: Introductionmentioning

confidence: 99%

Integrated Numerical and Experimental Data-Driven Parameter Identification of Electrode Properties in All-Vanadium Redox Flow Batteries

Cheng¹,

Tenny²,

Pizzolato³

et al. 2020

Preprint

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The vanadium redox flow battery (VRFB) is a promising energy storage technology for stationary applications (e.g., renewables integration) that offers a pathway to cost-effectiveness through independent scaling of power and energy as well as longevity. Many current research efforts are focused on improving battery performance through electrode modifications, but high-throughput, laboratory-scale testing can be time- and material-intensive. Advances in multiphysics-based numerical modeling and data-driven parameter identification afford a computational platform to expand the design space by rapidly screening a diverse array of electrode configurations. Herein, a 3D VRFB model is first developed and validated against experimental results. Subsequently, a new 2D model is composed, yielding a computationally light simulation framework, which is used to generate a dataset of 16800 electrode property combinations under four different cell voltages to track the impact of different structural parameters on the cell current density. These structure-performance relationships are quantified using Kendall $\tau$ rank correlation coefficients to highlight the dependence of cell performance on bulk electrode morphology and to identify improved property sets. This statistical framework may serve as a general guideline for parameter identification for more advanced electrode designs.

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“…Then, the bigger pores are filled with electrolyte. Also, Banerjee et al . used this technique to compare different carbon electrode materials concerning their internal pore structures and transport properties.…”

Section: Introductionmentioning

confidence: 99%

“…Then, the bigger pores are filled with electrolyte. Also, Banerjee et al [12] used this technique to compare different carbon electrode materials concerning their internal pore structures and transport properties. They found out that an increased wettability has a strong impact on the imbibition curve, lowering the pressure which is necessary for the electrolyte to invade into the carbon material.…”

Section: Introductionmentioning

confidence: 99%

X‐Ray‐Computed Radiography and Tomography Study of Electrolyte Invasion and Distribution inside Pristine and Heat‐Treated Carbon Felts for Redox Flow Batteries

et al. 2019

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Porous carbon felts (CFs) are widely used electrode materials for vanadium redox flow batteries (VRFBs). These materials differ in their precursor material, thickness, or graphitization degree and demonstrate broad differences in electrochemical performance. Prior to operation, an activation step, such as acid or heat treatment (HT), is commonly performed to improve their performance. A thermal treatment in air functionalizes the surface of the electrode and improves reaction kinetics as well as the wettability of the electrode. Herein, pristine and heat‐treated CFs are compared regarding their electrolyte wetting behavior for the use in VRFB. Contact angle (CA) measurements are conducted ex situ to investigate the effect of the HT. Furthermore, the porous CFs are examined in situ with an in‐house‐built flow cell regarding their invasion behavior with different types of electrolytes by X‐ray radiography. Additionally, the distribution of the electrolyte inside the felts is investigated by X‐ray tomography. The results demonstrate the effect of the HT and choice of electrolyte on the wetting behavior and electrolyte distribution.

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Characterization of carbon felt electrodes for vanadium redox flow batteries – A pore network modeling approach

Cited by 62 publications

References 52 publications

Data-driven electrode parameter identification for vanadium redox flow batteries through experimental and numerical methods

Data-driven electrode parameter identification for vanadium redox flow batteries through experimental and numerical methods

Integrated Numerical and Experimental Data-Driven Parameter Identification of Electrode Properties in All-Vanadium Redox Flow Batteries

X‐Ray‐Computed Radiography and Tomography Study of Electrolyte Invasion and Distribution inside Pristine and Heat‐Treated Carbon Felts for Redox Flow Batteries

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