Anion-chemistry-enabled positive valence conversion to achieve a record-high-voltage organic cathode for zinc batteries

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

8 Scopus Citations
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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)2204-2216
Journal / PublicationChem
Volume8
Issue number8
Online published24 May 2022
Publication statusPublished - 11 Aug 2022

Abstract

Chalcogens undergoing positive valence conversions show great potential to achieve a high discharge voltage in batteries; however, such reactions with high reversibility are difficult to achieve because element O/S/Se are inherently electron acceptors. Herein, by incorporating the chalcogens with the unique triphenylphosphine-based structure (strong electron-withdrawing groups), a high-potential triphenylphosphine selenide organic cathode (TP-Se) is developed. Facilitated by a Zn2+/trifluoromethanesulfonate (OTF) hosting mechanism, the (TP-Se) to (TP-Se)0 to (TP-Se)+ conversion is realized. The dual-ion Zn‖TP-Se batteries exhibit a flat discharge plateau at 1.96 V and a superior discharge capacity. Benefiting from the stable triphenylphosphine molecular structures and optimized hybrid electrolytes, excellent cycling performance is also attained (up to 85.3% capacity retention after 4,300 cycles). Moreover, the Zn‖TP-Se battery also delivers a remarkable rate performance. The system is attractive due to its high discharge voltage, which is higher than ever reported for organic cathodes of zinc batteries.

Research Area(s)

  • dual-ion batteries, hybrid electrolytes, n-/p-type conversion, organic electrodes, SDG11: Sustainable cities and communities, SDG7: Affordable and clean energy, zinc batteries