Tellurium with Reversible Six-Electron Transfer Chemistry for High-Performance Zinc Batteries

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

20 Scopus Citations
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Detail(s)

Original languageEnglish
Pages (from-to)20521-20529
Journal / PublicationJournal of the American Chemical Society
Volume145
Issue number37
Online published6 Sept 2023
Publication statusPublished - 20 Sept 2023

Abstract

Chalcogens, especially tellurium (Te), as conversion-type cathodes possess promising prospects for zinc batteries (ZBs) with potential rich valence supply and high energy density. However, the conversion reaction of Te is normally restricted to the Te2-/Te0 redox with a low voltage plateau at ∼0.59 V (vs Zn2+/Zn) rather than the expected positive valence conversion of Te0 to Ten+, inhibiting the development of Te-based batteries toward high output voltage and energy density. Herein, the desired reversible Te2-/Te0/Te2+/Te4+ redox behavior with up to six-electron transfer was successfully activated by employing a highly concentrated Cl--containing electrolyte (Cl- as strong nucleophile) for the first time. Three flat discharge plateaus located at 1.24, 0.77, and 0.51 V, respectively, are attained with a total capacity of 802.7 mAh g-1. Furthermore, to improve the stability of Ten+ products and enhance the cycling stability, a modified ionic liquid (IL)-based electrolyte was fabricated, leading to a high-performance Zn∥Te battery with high areal capacity (7.13 mAh cm-2), high energy density (542 Wh kgTe-1 or 227 Wh Lcathdoe+anode-1), excellent cycling performance, and a low self-discharge rate based on 400 mAh-level pouch cell. The results enhance the understanding of tellurium chemistry in batteries, substantially promising a remarkable route for advanced ZBs. © 2023 American Chemical Society.

Citation Format(s)

Tellurium with Reversible Six-Electron Transfer Chemistry for High-Performance Zinc Batteries. / Chen, Ze; Wang, Shengnan; Wei, Zhiquan et al.
In: Journal of the American Chemical Society, Vol. 145, No. 37, 20.09.2023, p. 20521-20529.

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