Effects of Carbon Fiber Compression Ratio and Electrolyte Flow Rate on the Electrochemical Performance of Vanadium Redox Batteries

Tai, Zhongxu; Hanawa, Kenzo; Ju, Dongying; Luo, Wenping; Lyu, Rui; Ishikawa, Kousuke; Sato, Susumu

doi:10.1155/2021/6646256

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…Это приносит ряд преимуществ по сравнению с обычными аккумуляторами. Прежде всего, такие устройства способны сохранять энергию в течение длительного времени практически без потерь, в то время как обычные аккумуляторы сталкиваются с потерями из-за внутренних процессов, приводящих к саморазряду [8][9][10][11].…”

Section: Introductionunclassified

Research and simulation of electrochemical processes in vanadium batteries

Mereke,

Chekiyeva,

Umirzakov

et al. 2023

jour

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Formulation of the problem: In the modern world, the development of efficient energy sources is becoming an increasingly important issue. One of the promising areas in the field of electrochemical energy sources is vanadium batteries. These batteries are based on electrochemical processes involving vanadium in various oxidative states. Research and modeling of electrochemical processes in vanadium batteries are important to optimize their performance and improve energy efficiency. Research and modeling of electrochemical processes in vanadium batteries play a key role in the development of efficient energy sources. Understanding the basic principles of operation of vanadium batteries, as well as the development of accurate mathematical models and their numerical simulation, allows optimizing the processes associated with storing and releasing energy. Further research and development in this area could lead to the creation of more efficient and sustainable energy sources that can meet the sustainable energy needs of modern society. Objective of the project: modeling the processes of vanadium redox flow batteries (VRFB) by varying the electrolyte flow to optimize electrochemical processes occurring under membrane-electrode boundary conditions. Results: this study simulates in the COMSOL Multiphysics software package the electrochemical characteristics of HFSC as a function of electrolyte flow. Tests were carried out in which the flow velocity parameters were examined to evaluate their effect on the potential distribution and current density. Practical significance: the energy in an HFSC is stored in a liquid electrolyte that is pumped through the cell. The electrolyte is stored in external reservoirs rather than in porous electrodes as in conventional batteries. The results contribute to improved efficient energy storage, load balancing, and peak power smoothing of the GRPB. The construction of models allows us to predict the effect on the efficiency of mixing electrolytes, taking into account the hydrodynamic conditions inside the battery to determine how they affect the transport of vanadium ions, taking into account the electrolyte flow rate.

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Section: Introductionunclassified

Research and simulation of electrochemical processes in vanadium batteries

Mereke,

Chekiyeva,

Umirzakov

et al. 2023

jour

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Computational Modeling of a 2D Vanadium Redox Flow Battery Cell

Martinez Lopez,

Aramendia,

Fernandez-Gamiz

et al. 2023

JOM

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These days, the implementation of sustainable power generation has led to a difference in propensity in the energy creation and capacity frameworks, compelling them to conquer the hardships that it addresses. Considering the entirety among the suggested technologies, vanadium redox flow batteries (VRFB) stand out as a wonderful choice regarding cyclability and versatility. The point of this study is to break down electrochemical performance of a vanadium redox flow battery cell in two dimensions. To accomplish this, a two-dimensional model comprising an ion exchange membrane, electrode and flow channel was created. A set of electrode compression and flow rates was tested to envision the impact on the velocity field, species concentration and potential and current distributions. As a result of compression, velocity profiles and reaction rates are both increased, by 12.7% and 9.2%, respectively, when applying 50% compression. Higher reaction rates and more stable concentration gradients were induced by higher electrolyte rates. Additionally, overpotential was reduced by 1.5% with the lowest flow rate.

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Effect of Hydrogen Pressure on The Mass Transfer Characteristics of Hydrogen-Bromine Flow Battery Electrodes

Ochoa Fajardo,

Mul,

Lammertink

2024

J. Electrochem. Soc.

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The mass transfer characteristics of porous carbon electrodes in the liquid side of a hydrogen bromine redox flow battery (H2-Br2 RFB) were investigated under compressive deformation caused by operation at high hydrogen pressure. Here, flow cell measurements of permeability and micro-particle image velocimetry (μPIV), alongside electrochemical measurements of capacitance and battery discharge were used to characterize changes in the liquid side electrode compression, in-plane liquid flow, accessible surface area, polarization, and mass transfer scaling brought by hydrogen pressure. We studied two electrode types with different structures, carbon paper and carbon cloth, in untreated well as heat-treated forms in the pressure range 0-8 bar H2. It was found that pressure-induced compression of the liquid side electrode increases the accessible area of untreated electrodes, with little effect on heat-treated electrodes, but decreases the electrochemical performance of the battery in all cases by increasing the ohmic resistance of the cell and decreasing the mass transfer coefficient of the porous electrode. Overall, heat treatment is shown to affect the rigidity, saturation behavior, and generalized mass transfer of paper electrodes but not of cloth electrodes. We hope our findings will guide the selection of electrode materials and operation parameters for the H2-Br2 RFB.

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Effects of Carbon Fiber Compression Ratio and Electrolyte Flow Rate on the Electrochemical Performance of Vanadium Redox Batteries

Cited by 3 publications

References 15 publications

Research and simulation of electrochemical processes in vanadium batteries

Research and simulation of electrochemical processes in vanadium batteries

Computational Modeling of a 2D Vanadium Redox Flow Battery Cell

Effect of Hydrogen Pressure on The Mass Transfer Characteristics of Hydrogen-Bromine Flow Battery Electrodes

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