PEG水系电解液用于高性能锌碘双离子电池

doi:10.13208/j.electrochem.211026

电化学（中英文） ›› 2023, Vol. 29 ›› Issue (11): 211026. doi: 10.13208/j.electrochem.211026

所属专题： “下一代二次电池”专题文章

PEG水系电解液用于高性能锌碘双离子电池

屈小峰¹, 唐宇婷¹, 何鑫程¹, 周佳晟¹, 唐子恒¹, 冯文华², 刘军¹^,^*()

1.广东工业大学，广东广州 510006
2.聂荣县科技局，西藏那曲，853500

收稿日期:2021-10-26 修回日期:2021-11-30 接受日期:2021-12-19 出版日期:2023-11-28 发布日期:2022-01-02
通讯作者: *Tel: (86)18773137462, E-mail: junliu23@gdut.edu.cn
基金资助:
国家自然科学基金面上项目(21673051);广东省科技厅国际合作项目(2019A050510043)

PEG-Water Electrolyte for High-Performance Zinc Iodine Dual-Ion Batteries

Xiao-Feng Qu¹, Yu-Ting Tang¹, Xin-Cheng He¹, Jia-Sheng Zhou¹, Zi-Heng Tang¹, Wen-Hua Feng², Jun Liu¹^,^*()

1. Guangdong University of Technology, Guangzhou 510006, China
2. Nie Rong County Science and Technology Bureau, Naqu, 853500, China

Received:2021-10-26 Revised:2021-11-30 Accepted:2021-12-19 Published:2023-11-28 Online:2022-01-02

摘要/Abstract

摘要：

碘因来源丰富和具有较快的氧化还原反应动力学使其作为电池的正极材料而倍受青睐，然而，由于碘单质在电解液中的高溶解性而带来的穿梭效应，使得电池的性能下降。本文在水系锌离子电解液中添加聚乙二醇(PEG400)和碘化钾，PEG400能与碘发生络合，抑制了单质碘和碘离子生成碘三离子（I₃^-）的反应，进而避免了碘的溶解；最后，该电解液搭配双层碳布集流体、锌片及双层隔膜组装成电池，在1 mA·cm^-2电流密度下，首圈容量可达1.62 mAh·cm^-2，参与氧化还原反应碘占该电池电解液中碘质量的47.52%，库仑效率为93%左右；而在7 mA·cm^-2高电流密度下，库仑效率可达98%左右，循环1200圈后，循环保持率为58.33%。

关键词: 锌碘电池, PEG400, 双离子电池, 络合, 高电流密度

Abstract:

Thanks to abundant resource and rapid redox reaction kinetics, iodine is regarded as promising positive materials in the batteries. However, the shuttling effect due to the high solubility of iodine in the electrolyte makes the performance of battery poor. In this paper, polyethylene glycol (PEG400) and potassium iodide were added into zinc-ion aqueous electrolyte. PEG400 could complex with iodine to reduce the dissolution of iodine, therefore alleviating the formation of soluble triiodide (I₃^-) from iodine and iodide ions. Furthermore, this electrolyte was used in the battery with double carbon cloths as the current collectors, double separators and zinc anode. At the current density of 1 mA·cm^-2, the first discharge capacity reached 1.62 mAh·cm^-2, and the coulombic efficiency was around 93%. Iodine involved in the electrochemical redox reaction is calculated to account for 47.52% of the total mass of iodine in this electrolyte. At high current density of 7 mA·cm^-2, its coulombic efficiency still remained 98%, and the rate of capacity retention was 58.33% after 1,200 cycles.

Key words: Zinc iodine battery, PEG400, Dual-ion batteries, Complexation, High current density

屈小峰, 唐宇婷, 何鑫程, 周佳晟, 唐子恒, 冯文华, 刘军. PEG水系电解液用于高性能锌碘双离子电池[J]. 电化学（中英文）, 2023, 29(11): 211026.

Xiao-Feng Qu, Yu-Ting Tang, Xin-Cheng He, Jia-Sheng Zhou, Zi-Heng Tang, Wen-Hua Feng, Jun Liu. PEG-Water Electrolyte for High-Performance Zinc Iodine Dual-Ion Batteries[J]. Journal of Electrochemistry, 2023, 29(11): 211026.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.13208/j.electrochem.211026

https://electrochem.xmu.edu.cn/CN/Y2023/V29/I11/211026

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Solution	Conductivity (mS·cm^-1)	Viscosity (mPa·s)
25% PEG	39.07	12.51
0.1 mol·L^-1KCl	12.85	—
1 mol·L^-1KCl	111.32	—
No PEG	91.85	2.47

PEG水系电解液用于高性能锌碘双离子电池

PEG-Water Electrolyte for High-Performance Zinc Iodine Dual-Ion Batteries

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