Yang Huijun, Chang Zhi, Qiao Yu, Deng Han, Mu Xiaowei, He Ping, Zhou Haoshen
Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Umezono, Tsukuba, 305-8568, Japan.
Graduate School of System and Information Engineering, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba, 305-8573, Japan.
Angew Chem Int Ed Engl. 2020 Jun 8;59(24):9377-9381. doi: 10.1002/anie.202001844. Epub 2020 Apr 6.
Rechargeable aqueous zinc batteries (RAZB) have been re-evaluated because of the superiority in addressing safety and cost concerns. Nonetheless, the limited lifespan arising from dendritic electrodeposition of metallic Zn hinders their further development. Herein, a metal-organic framework (MOF) was constructed as front surface layer to maintain a super-saturated electrolyte layer on the Zn anode. Raman spectroscopy indicated that the highly coordinated ion complexes migrating through the MOF channels were different from the solvation structure in bulk electrolyte. Benefiting from the unique super-saturated front surface, symmetric Zn cells survived up to 3000 hours at 0.5 mA cm , near 55-times that of bare Zn anodes. Moreover, aqueous MnO -Zn batteries delivered a reversible capacity of 180.3 mAh g and maintained a high capacity retention of 88.9 % after 600 cycles with MnO mass loading up to 4.2 mg cm .
由于在解决安全和成本问题方面具有优势，可充电水系锌电池（RAZB）已被重新评估。尽管如此，金属锌的树枝状电沉积导致的有限寿命阻碍了它们的进一步发展。在此，构建了一种金属有机框架（MOF）作为前表面层，以在锌阳极上维持一个过饱和电解质层。拉曼光谱表明，通过MOF通道迁移的高度配位离子络合物与本体电解质中的溶剂化结构不同。受益于独特的过饱和前表面，对称锌电池在0.5 mA cm下可存活长达3000小时，接近裸锌阳极的55倍。此外，水系MnO₂-Zn电池的可逆容量为180.3 mAh g，在MnO₂质量负载高达4.2 mg cm²的情况下，经过600次循环后仍保持88.9%的高容量保持率。
