Selenium-Anchored Chlorine Redox Chemistry in Aqueous Zinc Dual-Ion Batteries

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Article number2309330
Journal / PublicationAdvanced Materials
Publication statusOnline published - 27 Nov 2023

Abstract

Chlorine-based batteries with Cl0 to Cl redox reaction (ClRR) are promising for high-performance energy storage due to their high redox potential and large theoretical capacity. However, the inherent gas–liquid conversion feature of ClRR together with poor Cl fixation can cause Cl2 leakage, reducing battery reversibility. Herein, we utilize a Se-based organic molecule, diphenyl diselenide (di-Ph-Se), as the Cl anchoring agent and realize an atomic level-Cl fixation through chalcogen-halogen coordinating chemistry. The promoted Cl fixation, with two oxidized Cl0 anchoring on a single Ph-Se, and the multivalence conversion of Se contribute to a six-electron conversion process with up to 507 mAh g−1 and an average voltage of 1.51 V, as well as a high energy density of 665 Wh Kg−1. Based on the superior reversibility of the developed di-Ph-Se electrode with ClRR, a remarkable rate performance (205 mAh g−1 at 5 A g−1) and cycling performance (capacity retention of 77.3 % after 500 cycles) are achieved. Significantly, the pouch cell delivers a record arealcapacity of up to 6.87 mAh cm−2 and extraordinary self-discharge performance. This chalcogen-halogen coordination chemistry between the Se electrode and Cl provides a new insight for developing reversible and efficient batteries with halogen redox reactions. © 2023 Wiley-VCH GmbH.

Research Area(s)

  • aqueous batteries, organic electrodes, zinc batteries, zinc-ion batteries