Cheap colloidal energy storage battery

However, capacity loss and low Coulombic efficiency resulting from polyiodide cross-over hinder the grid-level battery performance. Here, we develop colloidal chemistry for iodine-starch catholytes, endowing enlarged-sized active materials by strong chemisorption-induced colloidal aggregation.

Nature Communications 15, Article number: 3841 (2024) Cite this article Aqueous Zn-I flow batteries utilizing low-cost porous membranes are promising candidates for high-power-density large-scale energy storage. However, capacity loss and low Coulombic efficiency resulting from polyiodide cross-over hinder the grid-level battery performance.

Zhao, D. et al. Enhancing I 0 /I − conversion efficiency by starch confinement in zinc–iodine battery. Energy Environ. Mater. 7, e12522 (2024). Liu, M. et al. Physicochemical confinement effect enables high-performing zinc–iodine batteries. J. Am. Chem. Soc. 144, 21683–21691 (2022).

Under the same working condition, the PP membrane-based flow batteries in blank electrolytes without starch showed inferior CE at around 65% with severe capacity loss, lower discharging capacity as ~25 Ah L −1catholyte, and short cycle lifespan (~50 cycles) due to the severe cross-over and short-circuits (Supplementary Fig. 30).

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For the I x− permeability under high temperature of 50 °C (Supplementary Figs. 42 and 43), the colloidal starch could strongly confine the polyiodides by forming a colloidal aggregation featuring low I x− permeability to impede the cross-over issue even at a severe condition of high temperature.