High-Energy Density Aqueous Zinc–Iodine Batteries with Ultra-long Cycle Life Enabled by the ZnI2 Additive,ACS Sustainable Chemistry & Engineering

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High-Energy Density Aqueous Zinc–Iodine Batteries with Ultra-long Cycle Life Enabled by the ZnI2 Additive
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-09-23 , DOI: 10.1021/acssuschemeng.1c04481
Chaojie Chen ₁ , Zhiwei Li ₁ , Yinghong Xu ₁ , Yufeng An ₁ , Langyuan Wu ₁ , Yao Sun ₁ , Haojie Liao ₁ , Kejun Zheng ₁ , Xiaogang Zhang ₁

Affiliation

Aqueous zinc–iodine batteries, featuring high energy density, safety, and cost-effectiveness, have been regarded as a promising energy storage system. Nevertheless, poor cycling stability and dissolution of iodine/polyiodide have greatly limited the development of zinc–iodine batteries. Here, iodine encapsulated by hierarchical porous carbon is employed as a positive material to assemble high-performance zinc–iodine batteries. Meanwhile, the utilization of the ZnI₂ additive in the electrolyte can enhance the capacity and cycling stability of as-assembled devices because the existence of polyiodide (I₃^– and I₅^–) can effectively inhibit the dissolution of iodine. Thanks to the high conductivity and interconnected structure of the prepared carbon material, the as-assembled zinc–iodine batteries deliver an excellent specific capacity of 360.6 mA h g^–1 at 0.5 C, a superb durability (∼98.4% retention of the initial capacity at a high density of 50 C after 35,000 cycles), and an ultra-high energy/power density of 422.6 W h kg^–1/21.6 kW kg^–1. Significantly, the mechanism of the constructed device was investigated by ex-situ Raman and ex-situ X-ray diffraction. Besides, when coupling carbon@I₂ electrodes with the hydrogel electrolyte to assemble quasi-solid-state zinc–iodine batteries, the as-built device can well service for an electronic clock.

中文翻译：

由 ZnI2 添加剂实现的具有超长循环寿命的高能量密度水合锌碘电池

水系锌碘电池具有能量密度高、安全性和成本效益高等优点，被认为是一种很有前途的储能系统。然而，碘/聚碘化物较差的循环稳定性和溶解性极大地限制了锌碘电池的发展。在这里，分级多孔碳封装的碘被用作组装高性能锌碘电池的正极材料。同时，ZnI的利用率₂在电解质添加剂可以增强容量和循环作为组装设备，因为多碘的（存在I的稳定性₃^- I和₅^-)能有效抑制碘的溶解。由于制备的碳材料的高导电性和互连结构，组装后的锌碘电池在 0.5 C 下提供了 360.6 mA hg ^–1的优异比容量，具有极好的耐久性（约 98.4% 的初始容量保留在35,000 次循环后达到 50 C 的高密度），以及 422.6 W h kg ^–1 /21.6 kW kg ^–1的超高能量/功率密度。重要的是，通过非原位拉曼和非原位X 射线衍射研究了所构建器件的机制。此外，当耦合碳@I ₂ 使用带有水凝胶电解质的电极来组装准固态锌碘电池，这样的设备可以很好地用于电子时钟。

更新日期：2021-10-04

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