Issue 5, 2023

Dual mechanism of ion (de)intercalation and iodine redox towards advanced zinc batteries

Abstract

Materials with layered structures have been widely adopted as ion-(de)intercalated-type cathodes for zinc ion batteries but suffer from the limited operating voltage of the restricted redox couple, while the I/I2 transition at high potential is limited by poor reversibility. Herein, a dual-active ion solution of Zn(CF3SO3)2 and ZnI2 in ethylene-glycol-substituted solvent is proposed, with a bifunctional cathode of NH4V4O10 and porous activated carbon to realize the integration of Zn2+ (de)intercalation and I/I2 redox. The solvation structure of Zn2+ with fewer H2O molecules, formed by monodentate and bidentate coordination with ethylene glycol, ensures stability and reversibility of the interfacial reaction, thus providing enhanced discharge medium voltage (0.96 V) and capacity retention (0.032% per cycle) at 0.2 A g−1. The compatibility of halogen redox and ion-(de)intercalation is deeply explored, offering a direction for mechanistic synergy in constructing advanced zinc-based batteries.

Graphical abstract: Dual mechanism of ion (de)intercalation and iodine redox towards advanced zinc batteries

Supplementary files

Article information

Article type
Paper
Submitted
15 fev 2023
Accepted
31 mar 2023
First published
31 mar 2023

Energy Environ. Sci., 2023,16, 2358-2367

Dual mechanism of ion (de)intercalation and iodine redox towards advanced zinc batteries

Y. Yang, S. Guo, Y. Pan, B. Lu, S. Liang and J. Zhou, Energy Environ. Sci., 2023, 16, 2358 DOI: 10.1039/D3EE00501A

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