Voltage loss and capacity fade reduction in vanadium redox battery by electrolyte flow control

Khaki, Bahman; Das, Pritam

doi:10.1016/j.electacta.2022.139842

Cited by 31 publications

(19 citation statements)

References 37 publications

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“…Electrolyte circulation flow rate is a key factor for determining the battery's achievable capacity. Recent studies demonstrated an increased capacity by increasing electrolyte flow rate [5,27–30] . However, a higher flow rate requires an increased pumping power which necessitates a decrease in system efficiency.…”

Section: Resultsmentioning

confidence: 99%

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Evaluation of Asymmetric Flow Rates for Better Performance Vanadium Redox Flow Battery

Fetyan,

Bamgbopa,

Andisetiawan

et al. 2023

Batteries & Supercaps

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Electrolyte imbalance caused by water and ion crossover is one of the main factors affecting the capacity of vanadium redox flow battery system over cycling. Ion crossover and the associated water transfer towards the positive half‐cell is mainly caused by the transfer of the vanadium ions, its bounded water and the water driven by osmosis. The different viscosity of the vanadium (III) ions in the negative half‐cell builds inconsistent pressure profiles at both half‐cells during charge‐discharge cycling and therefore magnifies ions and water transfer tendency. To mitigate the effect of electrolyte imbalance, herein we report an experimental study on the effect of using asymmetric flow rates in the negative and positive half‐cells. Over different current densities of 50mAcm‑2 100mAcm‑2 and 150 mAcm‑2, the use of one magnitude flow factor lower in the negative half‐cell and one magnitude flow factor higher in the positive half‐cell is superior to the symmetric flow rates on reducing electrolyte imbalance and subsequently, improving the capacity retention. At 100 mAcm‑2, a gain of 5% in discharge capacity coupled with energy efficiency improvement of around 3% is achieved using a cell with asymmetric flow rates compared to a cell with the symmetric flow rates after 50 cycles.

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Section: Resultsmentioning

confidence: 99%

“…Recent studies demonstrated an increased capacity by increasing electrolyte flow rate. [5,[27][28][29][30] However, a higher flow rate requires an increased pumping power which necessitates a decrease in system efficiency. The theoretical flow rate is usually calculated using Equation (1).…”

Section: Determination Of Optimum Electrolyte Flow Ratementioning

confidence: 99%

Evaluation of Asymmetric Flow Rates for Better Performance Vanadium Redox Flow Battery

Fetyan,

Bamgbopa,

Andisetiawan

et al. 2023

Batteries & Supercaps

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“…Capacity is a fundamental attribute of VRFBs, which determines how VRFBs can be utilized to work efficiently and keep the system running safely for optimal system cost. Therefore, it is necessary to grasp the mechanism and discipline of capacity attenuation and look for scientific and reasonable methods of capacity preservation and regeneration . In recent years, how to improve capacity attenuation to reduce capacity attenuation has become a non-negligible direction.…”

Section: Operational Optimizationmentioning

confidence: 99%

“…Therefore, it is necessary to grasp the mechanism and discipline of capacity attenuation and look for scientific and reasonable methods of capacity preservation and regeneration. 157 In recent years, how to improve capacity attenuation to reduce capacity attenuation has become a non-negligible direction. For example, Liu et al 158 achieved higher electrolyte utilization by reducing the vanadium/proton ratio during long battery operation, thus increasing battery capacity.…”

Section: ■ Operational Optimizationmentioning

confidence: 99%

Comprehensive Analysis of Critical Issues in All-Vanadium Redox Flow Battery

Huang

et al. 2022

ACS Sustainable Chem. Eng.

105

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Vanadium redox flow batteries (VRFBs) can effectively solve the intermittent renewable energy issues and gradually become the most attractive candidate for large-scale stationary energy storage. However, their low energy density and high cost still bring challenges to the widespread use of VRFBs. For this reason, performance improvement and cost reduction of VRFBs are the keys to their commercialization and large-scale energy storage applications. On the basis of this, this perspective briefly describes the development status of renewable energy and energy storage technology and summarizes the existing bottlenecks that affect the development of VRFBs. Meanwhile, the critical technologies of VRFBs are reviewed, and the research progress in recent years and the challenges that need to be overcome are introduced. This perspective focuses on four aspects, including core component material, system modeling, optimization operations, and future business challenges. Then, a comprehensive analysis of critical issues and solutions for VRFB development are discussed, which can effectively guide battery performance optimization and innovation. The views in this perspective are expected to provide effective and extensive understanding of the current research and future development of vanadium redox flow batteries.

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“…[7,8] The all-vanadium system is so far the most studied and developed flow battery system, which convinces by the absence of material degradation and capacity fade. [9,10] However, it suffers from the comparatively high prices and enormous price fluctuations regarding the electrolyte, [11] and from the fact that vanadium is a critical raw material. [12] Recently, organic redox-active materials have emerged as a promising alternative to metal-based systems due to their low cost, structural designability, and the independence on metal mining.…”

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confidence: 99%

A Multiscale Flow Battery Modeling Approach Using Mass Transfer Coefficients

2023

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Driven by the transformation of the energy system and the need to store fluctuating power generation from renewable energy sources, stationary storage systems become more and more important. [1] Flow batteries are promising candidates for balancing the demand and supply in the electrical grid and thus providing continuous and reliable power supply. The unique concept of flow batteries is based on the spatial separation of electrolyte and electrode which results in the independent scalability of power and capacity. [2,3] This makes them applicable in a wide energy range of the grid infrastructure. Moreover, long operating life cycles, environmental friendliness, and nonflammability are further advantages toward predominant storage systems. [4,5] However, high capital costs and low energy density predominantly have been preventing a deep market penetration up to the present. [6] A typical flow battery consists of two independent reservoirs holding separated electrolyte solutions and two porous electrodes separated by an ion transport membrane. During operation, the electrolytes are pumped through the electrochemical cell, where the redox reaction takes place at the surface of the porous electrodes. Subsequently, the charged or discharged electrolyte flows back into the reservoir. [7,8] The all-vanadium system is so far the most studied and developed flow battery system, which convinces by the absence of material degradation and capacity fade. [9,10] However, it suffers from the comparatively high prices and enormous price fluctuations regarding the electrolyte, [11] and from the fact that vanadium is a critical raw material. [12] Recently, organic redox-active materials have emerged as a promising alternative to metal-based systems due to their low cost, structural designability, and the independence on metal mining. [13,14] For this reason, this contribution focuses on an electrolyte for aqueous organic redox flow batteries, namely 4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl (4-OH-TEMPO). [11,15] Simulation methods are powerful tools for gaining insight into the multiphysical processes inside the battery and for predicting its performance for various operating conditions. They provide a substantial alternative to experimental investigations as these can be very challenging and costly in terms of raw materials, physical resources, and time. Modeling approaches for flow battery components and performance apply to a wide range of length scales. This contribution focuses on a detailed microscale model (MSM) and an upscale connection to a homogenized cell-scale model (HCSM).Three-dimensional MSMs resolve the actual electrode geometry to gain insights of the micro-structural processes within the battery. The structure of the electrode is obtained by image processing and reconstructing, mostly using X-ray-computed

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Voltage loss and capacity fade reduction in vanadium redox battery by electrolyte flow control

Cited by 31 publications

References 37 publications

Evaluation of Asymmetric Flow Rates for Better Performance Vanadium Redox Flow Battery

Evaluation of Asymmetric Flow Rates for Better Performance Vanadium Redox Flow Battery

Comprehensive Analysis of Critical Issues in All-Vanadium Redox Flow Battery

A Multiscale Flow Battery Modeling Approach Using Mass Transfer Coefficients

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