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Symposium EN13—Climate Change Mitigation Technologies

Symposium EN02—Solid-State Batteries—Electrodes, Electrolytes and Interphases

Phonnapha Tangthuam, Chulalongkorn University

Anionic Polyelectrolyte Coating as Artificial Solid Electrolyte Interface for Zinc Anode

Written by Chetna Madan

Zinc battery chemistry research is seeing a spike in recent times due to the promising features of excellent stability, high volumetric capacity, cheaper abundance, and economic viability. The high electrode potential of zinc (-0.76 V vs standard hydrogen electrode) makes it suitable to be used with an aqueous neutral or mildly acidic electrolyte. However, the challenges associated with corrosion, hydrogen evolution, and dendritic growth over long-term cycling inhibit its utilization. To address this problem with zinc anode, the researchers have developed an artificial solid electrolyte interface (ASEI) on the surface of zinc anode which regulates the nucleation and distribution of zinc ions for a uniform plating. As described, a zinc-carbon composite anode utilizing ultra-thin layers of carboxymethyl cellulose, an anionic polyelectrolyte, contributed toward dendrite-free zinc plating even at high current density due to fast ion migration. This ASEI is selectively permeable for Zn ions and highly efficient in preventing corrosion as confirmed from its electrochemical behavior.

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