In recent years, zinc-based flow batteries have developed rapidly and become one of the most promising options for large-scale energy storage technology [26, 27, , , , ]. The advantages of zinc-based flow batteries are as follows.
The history of zinc-based flow batteries is longer than that of the vanadium flow battery but has only a handful of demonstration systems. The currently available demo and application for zinc-based flow batteries are zinc-bromine flow batteries, alkaline zinc-iron flow batteries, and alkaline zinc-nickel flow batteries.
Indeed, not all zinc-based flow batteries have high energy density because of the limited solubility of redox couples in catholyte. In addition to the energy density, the low cost of zinc-based flow batteries and electrolyte cost in particular provides them a very competitive capital cost.
In addition to the energy density, the low cost of zinc-based flow batteries and electrolyte cost in particular provides them a very competitive capital cost. Taking the zinc-iron flow battery as an example, a capital cost of $95 per kWh can be achieved based on a 0.1 MW/0.8 MWh system that works at the current density of 100 mA cm-2 .
The decoupling nature of energy and power of redox flow batteries makes them an efficient energy storage solution for sustainable off-grid applications. Recently, aqueous zinc–iron
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Most importantly, the feasibility and practicality of a zinc-based flow battery system should be taken into consideration. Overall, benefiting from the above features, the zinc-based flow batteries
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storage battery Critically different from all-liquid flow batteries, the energy of a zinc-based flow battery is limited real capacity of zinc anode, which makes it become the limiting factor of
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Zinc-iron liquid flow batteries have high open-circuit voltage under alkaline conditions and can be cyclically charged and discharged for a long time under high current density, it has good
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