Refereed journal article or data article (A1)
Thermodynamics, Charge Transfer and Practical Considerations of Solid Boosters in Redox Flow Batteries
List of Authors: Moghaddam Mahdi, Sepp Silver, Wiberg Cedrik, Bertei Antonio, Rucci Alexis, Peljo Pekka
Publisher: MDPI
Publication year: 2021
Journal: Molecules
Journal name in source: MOLECULES
Journal acronym: MOLECULES
Volume number: 26
Issue number: 8
Number of pages: 19
DOI: http://dx.doi.org/10.3390/molecules26082111
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/58229254
Abstract
Solid boosters are an emerging concept for improving the performance and especially the energy storage density of the redox flow batteries, but thermodynamical and practical considerations of these systems are missing, scarce or scattered in the literature. In this paper we will formulate how these systems work from the point of view of thermodynamics. We describe possible pathways for charge transfer, estimate the overpotentials required for these reactions in realistic conditions, and illustrate the range of energy storage densities achievable considering different redox electrolyte concentrations, solid volume fractions and solid charge storage densities. Approximately 80% of charge storage capacity of the solid can be accessed if redox electrolyte and redox solid have matching redox potentials. 100 times higher active areas are required from the solid boosters in the tank to reach overpotentials of <10 mV.
Solid boosters are an emerging concept for improving the performance and especially the energy storage density of the redox flow batteries, but thermodynamical and practical considerations of these systems are missing, scarce or scattered in the literature. In this paper we will formulate how these systems work from the point of view of thermodynamics. We describe possible pathways for charge transfer, estimate the overpotentials required for these reactions in realistic conditions, and illustrate the range of energy storage densities achievable considering different redox electrolyte concentrations, solid volume fractions and solid charge storage densities. Approximately 80% of charge storage capacity of the solid can be accessed if redox electrolyte and redox solid have matching redox potentials. 100 times higher active areas are required from the solid boosters in the tank to reach overpotentials of <10 mV.
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