Mechanism

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The composition of zinc-bromine batteries is very similar to any flow battery, being formed by electrolytic solutions in the aqueous phase, where the reactive elements flow from the storage tanks to the cell. It is in the cell, formed by two electrodes, where reversible electrochemical reactions occur.

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Capacities and lifecycle

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Their energy performance can be around 75% and they can be used up to 12,000 cycles equivalent to 90% maximum discharge, This battery has enjoyed great acceptance within the flow batteries due to its relatively high voltage, its good energy density, the abundance and low cost of its reactants and its high degree of reversibility.  Its cost is around $ 225 per kWh. 

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Applications

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They are optimal for applications where energy storage is necessary to complement and support installations with intermittent power production. They can have applications such as microgrids or they can be integrated to the electricity grid with clean energies

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Advantages

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They can operate at temperatures up to 50°C without the need of refrigeration, they present greater integration and commercial availability and these batteries can be completely discharged without deterioration and without promoting degradation processes.

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Disadvantages

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The corrosion of materials and the formation of dendrites during the deposition of zinc in the charging cycle. Lower voltages than a lithium battery and complex hydraulic systems.

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Project: Development of the commercial prototype of the Zn-Br flow battery