By ESS news
Researchers from the Dalian Institute of Chemical Physics (DICP), Chinese Academy of Sciences, have developed a new bromine-based flow battery chemistry that addresses one of the technology’s longest-standing barriers: severe corrosion caused by free bromine during charging. The team reports that the approach simultaneously extends cycle life and increases energy density, potentially improving the commercial prospects for zinc-bromine (Zn/Br) flow batteries for long-term energy storage.
Bromine flow batteries are attractive for grid applications because bromine is abundant, highly soluble and offers a high redox potential. However, in conventional systems the charge reaction converts bromide (Br⁻) to elemental bromine (Br₂). The buildup of Br₂ leads to aggressive corrosion of electrodes, current collectors and membranes, typically limiting cycle life to a few hundred cycles and forcing the use of expensive, corrosion-resistant materials such as fluorinated membranes and titanium components.
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