Understanding the role of the porous electrode microstructure in redox flow battery performance using an experimentally validated 3D pore-scale lattice Boltzmann model

Zhang, Duo; Forner‐Cuenca, Antoni; Taiwo, Oluwadamilola O.; Yufit, Vladimir; Brushett, Fikile R.; Brandon, Nigel P.; Gu, Sai; Cai, Qiong

doi:10.1016/j.jpowsour.2019.227249

Cited by 87 publications

(69 citation statements)

References 54 publications

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“…The mass transport properties of the electrodes were found to be strongly correlated to the microstructure and an inverse relationship between permeability and mass transport was demonstrated, highlighting the ability of electrospinning to create tuneable microstructures with beneficial properties for RFBs. The combination of LBM with CT experimental data was recently applied to investigate the effect of microstructure on the mass transport, and to predict the electrolyte flow and reactant distributions of three different electrode materials (not electrospun) for non-aqueous RFBs by Zhang et al [134]. Better electrochemical results with homogenous pores subsequently validated the close connection between the electrode microstructure and battery performance.…”

Section: Overview the Historical Development Of Electrospun Materials In Redox Flow Batteriesmentioning

confidence: 99%

Electrospinning as a route to advanced carbon fibre materials for selected low-temperature electrochemical devices: A review

Wen

Kok

Tafoya

et al. 2021

Journal of Energy Chemistry

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Section: Overview the Historical Development Of Electrospun Materials In Redox Flow Batteriesmentioning

confidence: 99%

Electrospinning as a route to advanced carbon fibre materials for selected low-temperature electrochemical devices: A review

Wen

Kok

Tafoya

et al. 2021

Journal of Energy Chemistry

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“…Taiwo et al applied 3D X-ray CT to investigate the cycling graphite/Li half-cell in situ. [195] Operando synchrotron X-ray CT enabled the real time 3D visualization of pit formation at the Li metal surface due to Li dissolution. Time-lapse laboratory X-ray CT imaging was used to track the growth of moss-like lithium deposits at the Li electrode surface over longer periods of cycling.…”

Section: Optical Detection Methodsmentioning

confidence: 99%

Lithium Plating Detection Methods in Lithium-Ion Batteries

2020

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Lithium-ion batteries provide a low-cost, long cycle-life and high energy density solution to the expediting energy requirement of the automotive industry. There is a growing need of fast charging batteries for commercial application. However, large charging currents may cause Lithium plating which describes the deposition of metallic Lithium at the anode surface. It takes place at conditions of high currents and/or low temperatures because of kinetic limitations. The main reason behind plating is the slow solid-state diffusion of Lithium ions inside the active material. If the anode surface potential falls below 0 V versus Li/Li+, the formation of metallic Lithium is thermodynamically feasible. To avoid or reduce the amount Lithium plating, it is essential to detect its onset during a charging event. Determination of accurate Lithium plating curve is crucial in estimating the boundary conditions for battery operation without compromising life and safety. There are various data analysis methods involved in deriving the Lithium plating curve: anode potential using a three-electrode cell, variation of relaxation voltage after charging (dV/dt), variation of accumulated charge with voltage (dQ/dV) and coulombic efficiency of charge/discharge with %SOC (state of charge) are more commonly employed techniques. In addition to these methods, estimation of its occurrence is typically underpinned by electrochemical models where the negative (anode) electrode potential is expressed by a set of partial differential equations based on the electrochemical and physical properties of the battery components such as the electrodes and electrolyte. The present paper reviews the common test methods and analysis that are currently utilized in Lithium plating determination. Knowledge gaps are identified, and recommendations are made for the future development in the determination and verification of Lithium plating curve in terms of modelling and analysis.

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“…This result emphasizes the strong importance of porous media microstructure on the pressure drop and internal flow distribution across the electrode. As a matter of fact, strong channeling effects has been previously reported in RFB operation that can lead to significant distributed ohmic and mass transport losses, as well as reduced durability [50,[68][69][70].…”

Section: Constant Taperedmentioning

confidence: 99%

Modeling the Effect of Channel Tapering on the Pressure Drop and Flow Distribution Characteristics of Interdigitated Flow Fields in Redox Flow Batteries

et al. 2020

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Optimization of flow fields in redox flow batteries can increase performance and efficiency, while reducing cost. Therefore, there is a need to establish a fundamental understanding on the connection between flow fields, electrolyte flow management and electrode properties. In this work, the flow distribution and pressure drop characteristics of interdigitated flow fields with constant and tapered cross-sections are examined numerically and experimentally. Two simplified 2D along-the-channel models are used: (1) a CFD model, which includes the channels and the porous electrode, with Darcy’s viscous resistance as a momentum sink term in the latter; and (2) a semi-analytical model, which uses Darcy’s law to describe the 2D flow in the electrode and lubrication theory to describe the 1D Poiseuille flow in the channels, with the 2D and 1D sub-models coupled at the channel/electrode interfaces. The predictions of the models are compared between them and with experimental data. The results show that the most influential parameter is γ , defined as the ratio between the pressure drop along the channel due to viscous stresses and the pressure drop across the electrode due to Darcy’s viscous resistance. The effect of R e in the channel depends on the order of magnitude of γ , being negligible in conventional cells with slender channels that use electrodes with permeabilities in the order of 10 − 12 m 2 and that are operated with moderate flow rates. Under these conditions, tapered channels can enhance mass transport and facilitate the removal of bubbles (from secondary reactions) because of the higher velocities achieved in the channel, while being pumping losses similar to those of constant cross-section flow fields. This agrees with experimental data measured in a single cell operated with aqueous vanadium-based electrolytes.

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Understanding the role of the porous electrode microstructure in redox flow battery performance using an experimentally validated 3D pore-scale lattice Boltzmann model

Cited by 87 publications

References 54 publications

Electrospinning as a route to advanced carbon fibre materials for selected low-temperature electrochemical devices: A review

Electrospinning as a route to advanced carbon fibre materials for selected low-temperature electrochemical devices: A review

Lithium Plating Detection Methods in Lithium-Ion Batteries

Modeling the Effect of Channel Tapering on the Pressure Drop and Flow Distribution Characteristics of Interdigitated Flow Fields in Redox Flow Batteries

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