Organic pH Buffer for Dendrite-Free and Shuttle-Free Zn-I₂ Batteries.

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2023

Authors

Lyu, Y.
Yuwono, J.
Wang, P.
Wang, Y.
Yang, F.
Liu, S.
Zhang, S.
Wang, B.
Davey, K.
Mao, J.

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Angewandte Chemie International Edition, 2023; 62(21):e202303011-1-e202303011-10

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Yanqiu Lyu, Jodie A. Yuwono, Pengtang Wang, Yanyan Wang, Fuhua Yang, Sailin Liu, Shilin Zhang, Baofeng Wang, Kenneth Davey, Jianfeng Mao, and Zaiping Guo

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Abstract

Aqueous Zn-iodine (I2) batteries are attractive for large-scale energy storage. However, drawbacks include, Zn dendrites, hydrogen evolution reaction (HER), corrosion and, cathode 'shuttle' of polyiodines. Here we report a class of N-containing heterocyclic compounds as organic pH buffers to obviate these. We evidence that addition of pyridine /imidazole regulates electrolyte pH, and inhibits HER and anode corrosion. In addition, pyridine and imidazole preferentially absorb on Zn metal, regulating non-dendritic Zn plating /stripping, and achieving a high Coulombic efficiency of 99.6% and long-term cycling stability of 3,200 h at 2 mA cm⁻², 2 mAh cm⁻². It is also confirmed that pyridine inhibits polyiodines shuttling and boosts conversion kinetics for I-/I₂. As a result, the Zn-I₂ full battery exhibits long cycle stability of > 25,000 cycles and high specific capacity of 105.5 mAh g⁻¹ at 10 A g⁻¹. We conclude organic pH buffer engineering is practical for dendrite-free and shuttle-free Zn-I₂ batteries.

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Published May 2023

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© 2023 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution Non-Commercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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