What factors contribute to the capacity decay of all-vanadium redox flow batteries?

Learn more. A systematic and comprehensive analysis is conducted on the various factors that contribute to the capacity decay of all-vanadium redox flow batteries, including vanadium ions cross-over, self-discharge reactions, water molecules migration, gas evolution reactions, and vanadium precipitation.

Does constant capacity decay affect long-term stability of vanadium flow batteries?

Nevertheless, constant capacity decay severely jeopardizes their long-term stability. The capacity-decay mechanism of vanadium flow batteries using a Nafion membrane is investigated and elucidated. Capacity-restoration methods are proposed and experimentally validated.

Why are vanadium redox flow battery systems important?

Battery storage systems become increasingly more important to fulfil large demands in peaks of energy consumption due to the increasing supply of intermittent renewable energy. The vanadium redox flow battery systems are attracting attention because of scalability and robustness of these systems make them highly promising.

Are all-vanadium redox flow batteries a viable energy storage technology?

Abstract: As a promising large-scale energy storage technology, all-vanadium redox flow battery has garnered considerable attention. However, the issue of capacity decay significantly hinders its further development, and thus the problem remains to be systematically sorted out and further explored.

Are Nafion series membranes suitable for vanadium redox flow batteries?

Nafion series membranes are widely used in vanadium redox flow batteries (VRFBs). However, the poor ion selectivity of the membranes to vanadium ions, especially for V 2+, results in a rapid capacity decay during cycling.

Why does a vanadium electrolyte deteriorate a battery membrane?

Exposure of the polymeric membrane to the highly oxidative and acidic environment of the vanadium electrolyte can result in membrane deterioration. Furthermore, poor membrane selectivity towards vanadium permeability can lead to faster discharge times of the battery. These areas seek room for improvement to increase battery lifetime.