Su Lijun, Liu Lingyang, Liu Bao, Meng Jianing, Yan Xingbin
Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
Cuiying Honors College, Lanzhou University, Lanzhou, 730000, China.
iScience. 2020 Apr 24;23(4):100995. doi: 10.1016/j.isci.2020.100995. Epub 2020 Mar 20.
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-MnO 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 MnO 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.
水系锌离子电池（ZIBs）是很有前景的低成本、高安全性储能装置。然而，其容量衰减，尤其是在初始循环阶段，是一个严重问题。在此，我们揭示了水系电解质中的溶解氧对锌负极和水系锌离子电池的电化学有显著影响。去除氧气后，Zn/Zn对称电池能够进行可逆的电镀/脱镀，与富氧条件相比，寿命提高了20倍。以水系Zn-MnO电池为例，尽管由于MnO对氧气的电催化活性，在初始循环中氧气的存在可以贡献超过20%的额外容量，但在无氧环境中可以消除锌负极的腐蚀，从而提供更好的可逆储能系统。溶解氧对循环稳定性的影响也存在于其他使用钒基化合物、水钠锰矿和普鲁士蓝类似物阴极的水系锌离子电池中。
