High-Performance Aqueous Zinc-Ion Batteries Realized by MOF Materials

• Published in: Nano-micro letters 2020-07, Vol.12 (1), p.152-15, Article 152
• Main Authors: Pu, Xuechao, Jiang, Baozheng, Wang, Xianli, Liu, Wenbao, Dong, Liubing, Kang, Feiyu, Xu, Chengjun
• Format: Article
• Language: English
• Subjects: Anodes; Anodic coatings; Cathode material; Cathodes; Cycles; Electrode materials; Energy storage; Engineering; Fading; Metal foils; Metal-organic frameworks; Metal–organic framework; Nanoscale Science and Technology; Nanotechnology; Nanotechnology and Microengineering; Rechargeable batteries; Storage batteries; Stripping; Toxicity; Zinc; Zinc plating; Zinc-ion battery; Zn anode
• ISSN: 2311-6706; 2150-5551
• DOI: 10.1007/s40820-020-00487-1

Highlights Various MOF materials were synthesized and investigated as ZIB cathodes. A long-term stable ZIF-8@Zn anode was proposed by coating ZIF-8 material on the surface of zinc foils. High-performance aqueous ZIBs were constructed using the Mn(BTC) cathode and the ZIF-8@Zn anode. Rechargeable aqueous zinc-ion batteries (ZIBs) have been gaining increasing interest for large-scale energy storage applications due to their high safety, good rate capability, and low cost. However, the further development of ZIBs is impeded by two main challenges: Currently reported cathode materials usually suffer from rapid capacity fading or high toxicity, and meanwhile, unstable zinc stripping/plating on Zn anode seriously shortens the cycling life of ZIBs. In this paper, metal–organic framework (MOF) materials are proposed to simultaneously address these issues and realize high-performance ZIBs with Mn(BTC) MOF cathodes and ZIF-8-coated Zn (ZIF-8@Zn) anodes. Various MOF materials were synthesized, and Mn(BTC) MOF was found to exhibit the best Zn 2+ -storage ability with a capacity of 112 mAh g −1 . Zn 2+ storage mechanism of the Mn(BTC) was carefully studied. Besides, ZIF-8@Zn anodes were prepared by coating ZIF-8 MOF material on Zn foils. Unique porous structure of the ZIF-8 coating guided uniform Zn stripping/plating on the surface of Zn anodes. As a result, the ZIF-8@Zn anodes exhibited stable Zn stripping/plating behaviors, with 8 times longer cycle life than bare Zn foils. Based on the above, high-performance aqueous ZIBs were constructed using the Mn(BTC) cathodes and the ZIF-8@Zn anodes, which displayed an excellent long-cycling stability without obvious capacity fading after 900 charge/discharge cycles. This work provides a new opportunity for high-performance energy storage system.