scholarly journals Fast computing flow battery modeling to optimize the choice of electrolytes and operating conditions – Application to aqueous organic electrolytes

2021 ◽  
pp. 138961
Author(s):  
Quentin Cacciuttolo ◽  
Martin Petit ◽  
David Pasquier
Keyword(s):  
Operating Conditions ◽  
Flow Battery ◽  
Organic Electrolytes ◽  
Battery Modeling

scholarly journals Electrochemical Studies on Alizarin Red S as Negolyte for Redox Flow Battery: a Preliminary Study

2018 ◽  
Vol 7 (4.35) ◽  
pp. 375
Author(s):  
C. Khor ◽  
M. R. Mohamed ◽  
C. K. Feng ◽  
P. K. Leung
Keyword(s):  
Diffusion Coefficient ◽  
Negative Electrode ◽  
Operating Conditions ◽  
Alizarin Red S ◽  
Fast Diffusion ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Alizarin Red ◽  
Redox Flow Batteries ◽  
Flow Batteries

Redox flow battery (RFB) has received tremendous attention as energy storage system coupled with renewable energy sources. In this paper, a low-cost alizarin red S (ARS) organic dye is proposed to serve as the active material for the negative electrode reaction for organic redox flow batteries. Cyclic voltammetry has been conducted under a number of operating conditions to reveal the electrochemical performance of this molecule. The results suggest that ARS is highly reversible at low electrode potential (c.a. 0.082 V vs. standard hydrogen electrode), indicating that ARS is a promising negative electrode material for organic redox flow batteries. The diffusion coefficient of ARS is calculated in the range of 6.424 x 10-4 cm2 s-1, This has indicated fast diffusion rate and electrochemical kinetics for oxidation and reduction in higher concentration of ARS. It has been found out that the higher concentration of ARS in base electrolyte cause lowest diffusion coefficient due to solubility issue of ARS.

Development and perspective in vanadium flow battery modeling

2014 ◽  
Vol 132 ◽  
pp. 254-266 ◽  
Author(s):  
Qiong Zheng ◽  
Xianfeng Li ◽  
Yuanhui Cheng ◽  
Guiling Ning ◽  
Feng Xing ◽  
...  
Keyword(s):  
Flow Battery ◽  
Battery Modeling

scholarly journals Modeling the Performance of a Zinc/Bromine Flow Battery

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1159 ◽  
Author(s):  
Boram Koo ◽  
Dongcheul Lee ◽  
Jaeshin Yi ◽  
Chee Shin ◽  
Dong Kim ◽  
...  
Keyword(s):  
Low Cost ◽  
Single Cells ◽  
Equivalent Circuit Model ◽  
Operating Conditions ◽  
Flow Battery ◽  
Production Scale ◽  
Modeling Methodology ◽  
Good Energy ◽  
Polarization Characteristics ◽  
High Degree

The zinc/bromine (Zn/Br2) flow battery is an attractive rechargeable system for grid-scale energy storage because of its inherent chemical simplicity, high degree of electrochemical reversibility at the electrodes, good energy density, and abundant low-cost materials. It is important to develop a mathematical model to calculate the current distributions in a Zn/Br2 flow cell in order to predict such quantities as current, voltage, and energy efficiencies under various charge and discharge conditions. This information can be used to design both of bench and production scale cells and to select the operating conditions for optimum performance. This paper reports a modeling methodology to predict the performance of a Zn/Br2 flow battery. The charge and discharge behaviors of a single cell is calculated based on a simple modeling approach by considering Ohm’s law and charge conservation on the electrodes based on the simplified polarization characteristics of the electrodes. An 8-cell stack performance is predicted based on an equivalent circuit model composed of the single cells and the resistances of the inlet and outlet streams of the positive and negative electrolytes. The model is validated by comparing the modeling results with the experimental measurements.

Dynamic Model of a Vanadium Redox Flow Battery for System Performance Control

2013 ◽  
Vol 136 (2) ◽  
Author(s):  
Victor Yu ◽  
Dongmei Chen
Keyword(s):  
Mass Transfer ◽  
System Performance ◽  
Operating Cost ◽  
Operating Conditions ◽  
Vanadium Redox Flow Battery ◽  
Electrochemical Kinetics ◽  
Voltage Response ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Vanadium Redox

The vanadium redox flow battery (VRFB) is an attractive grid scale energy storage option, but high operating cost prevents widespread commercialization. One way of mitigating cost is to optimize system performance, which requires an accurate model capable of predicting cell voltage under different operating conditions such as current, temperature, flow rate, and state of charge. This paper presents a lumped isothermal VRFB model based on principles of mass transfer and electrochemical kinetics that can predict transient performance with respect to the aforementioned operating conditions. The model captures two important physical phenomena: (1) mass transfer at the electrode surface and (2) vanadium crossover through the membrane. Mass transfer effects increase the overpotential and thus reduce the battery output voltage during discharge. Vanadium crossover causes a concentration imbalance between the two half-cells that negatively affects the voltage response particularly after long term cycling. Further analysis on the system linearity is conducted to assess the feasibility of using a linear control design methodology.

scholarly journals Mass Transport Optimization for Redox Flow Battery Design

2020 ◽  
Vol 10 (8) ◽  
pp. 2801 ◽  
Author(s):  
Nicholas Gurieff ◽  
Declan Finn Keogh ◽  
Mark Baldry ◽  
Victoria Timchenko ◽  
Donna Green ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Pump Energy ◽  
Energy Transition ◽  
Active Species ◽  
Operating Conditions ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Charge Voltage ◽  
Available Energy

The world is moving to the next phase of the energy transition with high penetrations of renewable energy. Flexible and scalable redox flow battery (RFB) technology is expected to play an important role in ensuring electricity network security and reliability. Innovations continue to enhance their value by reducing parasitic losses and maximizing available energy over broader operating conditions. Simulations of vanadium redox flow battery (VRB/VRFB) cells were conducted using a validated COMSOL Multiphysics model. Cell designs are developed to reduce losses from pump energy while improving the delivery of active species where required. The combination of wedge-shaped cells with static mixers is found to improve performance by reducing differential pressure and concentration overpotential. Higher electrode compression at the outlet optimises material properties through the cell, while the mixer mitigates concentration gradients across the cell. Simulations show a 12% lower pressure drop across the cell and a 2% lower charge voltage for improved energy efficiency. Wedge-shaped cells are shown to offer extended capacity during cycling. The prototype mixers are fabricated using additive manufacturing for further studies. Toroidal battery designs incorporating these innovations at the kW scale are developed through inter-disciplinary collaboration and rendered using computer aided design (CAD).

scholarly journals Mass Transport Optimization for Redox Flow Battery Design

2020 ◽  
Author(s):  
Nicholas Gurieff ◽  
Declan Finn Keogh ◽  
Mark Bladry ◽  
Victoria Timchenko ◽  
Donna Green ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
Pump Energy ◽  
Energy Transition ◽  
Active Species ◽  
Operating Conditions ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Performance Modelling ◽  
Improve Energy Efficiency

The world is moving to the next phase of the energy transition with high penetrations of renewable energy. Flexible and scalable redox flow battery (RFB) technology is expected to play an important role in ensuring electricity network security and reliability. Continuous performance improvements will further enhance their value by reducing parasitic losses and maximizing available energy conversion over broader operating conditions. Concentration overpotentials from poor internal reactant distribution at high and low states of charge (SOC) limit power densities and are thus an important area of investigation. However, efforts to address these coupled electrochemical phenomena can compromise mechanical performance. Modelling and simulation of cell design innovations have shown it is possible to reduce losses from pump energy while increasing the availability of active species where required. The combination of wedge-shaped cells with static mixers investigated in this paper can reduce pressure drop and improve energy efficiency. Toroidal vanadium redox flow battery (VRB/VRFB) designs incorporating this innovation are presented for further development to improve community engagement with the technology.

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