Newsletter Edition 07/2021

The Newsletter gives updates about the recent activities around the computational approaches to RFBs. The first version takes a quick tour through the lowest scales, starting from first principles calculations, proceeding via kinetic Monte Carlo simulations and finally culminating in continuum computations of a simplified cell.

Read the full version here

Work on system modelling and cost analysis started in SONAR

September 2021

Current distribution of the 2D single cell of VRFB under different constant flow rates, left) flowrate = 30 mL/min right) flow rate = 5 mL/min

The University of New South Wales and Fraunhofer ICT started their work on stack and system modeling and cost analysis for organic flow batteries, with one new PhD student at each of the two institutions. The system modeling will be carried out using a multiphysics approach, where first the hydraulic, electrochemical and thermal properties of a single cell, then a stack and finally a whole flow battery system are modeled and simulated. The results will lead to a better understanding of systems and thus to cheaper and more reliable systems, and also form the basis for the cost analysis.

In the cost analysis of flow battery systems, Fraunhofer ICT is concerned with linking technical parameters with costs using mathematical functions. The objective is to map a cost structure for the investment costs of flow batteries in order to determine cost proportions and for sensitivity analyses. Based on the calculated costs, batteries can be compared on the basis of investment costs (CAPEX). A much more substantiated comparison is possible based on levelized cost of storage (LCOS), where lifetime costs are calculated in relation to energy throughput. In the future, it will be possible to calculate the LCOS of a large number of new organic flow battery chemistries automatically, in order to be able to develop low-cost candidates for new, safe and environmentally friendly organic flow batteries for the storage of renewable energy.

New Paper about predicting pH-dependent Redox Potentials

June 29, 2021

In the Special Issue Computational Design and Modelling of Organic Materials for Energy Applications of Molecules Rocco Fornari and Piotr de Silva present a computational protocol combining DFT and Cheminformatics for pH-Dependent Redox Potentials:

Animation of RFB discharge simulation with constant inlet concentration

June, 2021

© Amadeus Wolf, KIT, Germany

The image shows a pore scale 2D slice that is coloured according to the [4-OH-TEMPO]+ concentration in mol/m³.  Wholes represent cylindrical electrode fibres and arrows represent the steady-state velocity profile in m/s with Reynolds-Number of 0.0005. Note the depletion of [4-OH-TEMPO]+  at the electrode-electrolyte interface over time: The concentration profile evolves according to the velocity field and reaches a steady state after several milliseconds.

New paper on a graph convolutional network for rapid prescreening of organic compounds

May 31, 2021

A paper on machine learning for predicting formal potentials appears in a Special Collection on Artificial Intelligence in Electrochemical Energy Storage in Batteries & Supercaps by Laura Berg et al:

Interview of Maria Skyllas-Kazacos by QEM’s managing director Gavin Loyden

May 27, 2021

Find the full interview here.

Flow Batteries Europe: Long-Term Strategy for Flow Battery Technology

April 28, 2021

In order to create more awareness for RFB technology, and to combine the interests of industry and research in the field, the association “Flow Batteries Europe” was founded on 28.04.2021. Flow Batteries Europe will try to increase knowledge about redox flow batteries through dissemination and policy briefing.

The German/Australian Alliance for Electrochemical Technologies for Renewable Energy Storage (CENELEST) is a founding member of Flow Batteries Europe. CENELEST member and FlowCamp coordinator Dr. Peter Fischer (Fraunhofer ICT) was elected to the Executive Board and will represent Fraunhofer ICT (Germany) and the University of New South Wales (Australia) in Flow Batteries Europe.

For more information about the association, please contact Peter Fischer or visit the website.