用于无枝晶和无穿梭的 Zn-I 电池的有机 pH 缓冲剂。
Organic pH Buffer for Dendrite-Free and Shuttle-Free Zn-I Batteries.
机构信息
School of Chemical Engineering, the University of Adelaide, Adelaide, SA, 5005, Australia.
Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai, 200090, China.
出版信息
Angew Chem Int Ed Engl. 2023 May 15;62(21):e202303011. doi: 10.1002/anie.202303011. Epub 2023 Apr 17.
Aqueous Zn-Iodine (I ) 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 3200 h at 2 mA cm , 2 mAh cm . It is also confirmed that pyridine inhibits polyiodines shuttling and boosts conversion kinetics for I /I . As a result, the Zn-I full battery exhibits long cycle stability of >25 000 cycles and high specific capacity of 105.5 mAh g at 10 A g . We conclude organic pH buffer engineering is practical for dendrite-free and shuttle-free Zn-I batteries.
水系锌碘（I ）电池因其在大规模储能方面的吸引力而备受关注。然而，其存在一些缺点，包括锌枝晶、析氢反应（HER）、腐蚀和多碘化物的阴极“穿梭”效应。在这里，我们报告了一类含氮杂环化合物作为有机 pH 缓冲剂来克服这些问题。我们证明，添加吡啶/咪唑可以调节电解液 pH 值，并抑制 HER 和阳极腐蚀。此外，吡啶和咪唑优先吸附在 Zn 金属上，调节非枝晶 Zn 电镀/剥离，实现了 99.6%的高库仑效率和 2 mA cm ，2 mAh cm 下 3200 小时的长期循环稳定性。还证实了吡啶抑制多碘化物的穿梭，并促进了 I /I 的转化动力学。因此，Zn-I 全电池表现出超过 25000 次循环的长循环稳定性和 105.5 mAh g 的高比容量，在 10 A g 下。我们得出结论，有机 pH 缓冲剂工程对于无枝晶和无穿梭的 Zn-I 电池是实用的。
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