当前位置: X-MOL 学术ACS Sustain. Chem. Eng. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
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
down
wechat
bug