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Revealing the Impact of Oxygen Dissolved in Electrolytes on Aqueous Zinc-Ion Batteries.
iScience ( IF 5.8 ) Pub Date : 2020-03-20 , DOI: 10.1016/j.isci.2020.100995
Lijun Su 1 , Lingyang Liu 1 , Bao Liu 1 , Jianing Meng 2 , Xingbin Yan 3
Affiliation  

Aqueous zinc-ion batteries (ZIBs) are promising low-cost and high-safety energy storage devices. However, their capacity decay especially at the initial cyclic stage is a serious issue. Herein, we reveal that the dissolved oxygen in aqueous electrolyte has significant impact on the electrochemistry of Zn anode and ZIBs. After removing oxygen, the symmetrical set-up of Zn/Zn is capable of reversible plating/stripping with a 20-fold lifetime enhancement compared with that in oxygen enrichment condition. Taking aqueous Zn-MnO2 battery as an example, although the presence of oxygen can contribute an extra capacity over 20% at the initial cycles due to the electrocatalytic activity of MnO2 with oxygen, the corrosion of Zn anode can be eliminated in the oxygen-free circumstance and thus offering a better reversible energy storage system. The impact of the dissolved oxygen on the cycling stability also exists in other ZIBs using vanadium-based compounds, Birnessite and Prussian blue analog cathodes.



中文翻译:

揭示溶解在电解质中的氧气对水性锌离子电池的影响。

锌离子水电池(ZIBs)是有前途的低成本和高安全性的能量存储设备。但是,它们的容量衰减,特别是在初始循环阶段,是一个严重的问题。在此,我们揭示了电解质水溶液中的溶解氧对Zn阳极和ZIBs的电化学有重要影响。除去氧气后,与氧气富集条件相比,Zn / Zn的对称设置能够进行可逆镀覆/剥离,使用寿命提高20倍。以水溶液的Zn-的MnO 2电池作为一个例子,虽然氧的存在可有助于在在初始周期20%的额外容量由于MnO的的电催化活性2使用氧气,可以在无氧的情况下消除Zn阳极的腐蚀,从而提供更好的可逆储能系统。使用钒基化合物,水钠锰矿和普鲁士蓝类似物阴极的其他ZIB中也存在溶解氧对循环稳定性的影响。

更新日期:2020-03-20
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