Aluminum/Bromate and Aluminum/Iodate Mechanically Rechargeable Batteries

Batteries. 2022. Vol. 8. No. 12. Article 270.

Alexander Modestov, Andreev V., Antipov A.

The ever-increasing characteristics of microcomputers, sensors, actuators, and communication
systems require more powerful and more compact autonomous power sources. Al/bromate
and Al/iodate flow batteries are proposed as new power supply units for use in oxygen-deficient
environments. The batteries employ a mechanically rechargeable aluminum anode flooded with
aqueous salt electrolytes or seawater, a cation-exchange membrane, and a carbonaceous porous
cathode, where acidified alkali metal bromate, or iodate, is reduced in a six-electron process. The
theoretical energy density of an Al/bromate flow cell per reactants is 0.65 kWh kg􀀀1. Seawater is
assumed as an electrolyte for the anode compartment. Using a H2/iodate flow cell, it is shown that
iodate–iodine–iodide electrochemical transformations can be realized in both directions in acidic media
at carbonaceous electrodes. At 30 C, the area-specific power of the single cells of the Al/bromate
and Al/iodate flow batteries reaches 0.26W cm􀀀2 and 0.075 W cm􀀀2, respectively.

Ключевые слова: battery, Redox chemistry