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June 16, 2022

Redox Battery Chemistry FAQ

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Redox (Liquid Electrode) Cells

These consist of a semipermeable membrane having different liquids on either side. The membrane permits ion flow but prevents mixing of the liquids. Electrical contact is made through inert conductors in the liquids. As the ions flow across the membrane an electric current is induced in the conductors. These cells and batteries have two ways of recharging. The first is the traditional way of running current backwards. The other is replacing the liquids, which can be recharged in another cell. A small cell can also be used to charge a great quantity of liquid flowing through it, which is stored outside the cells. This is an interesting way to store energy for alternative energy sources that are unreliable, such as solar, wind, and tide. These batteries have low volumetric efficiency, but are reliable and very long lived.

Electrochemical systems that can be used are FeCl3 (cathode) and TiCl3 or CrCl2 (anode).

Vanadium redox cells: A particularly interesting cell uses vanadium oxides of different oxidation states as the anode and cathode. These solutions will not be spoiled if the membrane leaks, since the mixture can be charged as either reducing or oxidizing components.

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