IR Spectroscopy as a Method for Online Electrolyte State Assessment in RFBs

The transition from fossil to renewable energy sources requires adequate storage technologies due the intermittency of supplied energy. With respect this, organic redox-flow batteries (ORFBs) represent a promising concept for electricity on large scale at economically justifiable costs. However, these can only be operated reliably if parameters representing actual condition medium (i.e., electrolyte) accurately assessed. These so-called electrolyte state variables are represented by two key figures merit: charge (SOC), measure amount that currently holds; and health (SOH), is able store given its current condition. herein presented IR-based approach simultaneously provide reliable, fast, accurate, precise estimates both SOC SOH any point in time independent battery status. method resolution range minutes, temperature applied nearly all organic-based redox-active materials solvents, while potentially being applicable inorganic RFBs, such as vanadium-based systems, well.