15August2020

Nano-Micro Letters

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

Xuechao Pu1, 2, Baozheng Jiang1, 3, Xianli Wang1, Wenbao Liu1, 2, Liubing Dong4, *, Feiyu Kang1, 2, Chengjun Xu1, *

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Nano-Micro Lett. (2020) 12: 152

First Online: 17 July 2020 (Article)

DOI:10.1007/s40820-020-00487-1

*Corresponding author. E-mail: donglb@jnu.edu.cn (L. Dong); vivaxuchengjun@163.com (C. Xu)

 

Abstract

 


Toc

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 of ZIBs 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 aqueous zinc-ion batteries with Mn(BTC) MOF cathodes and ZIF-8 coated Zn (ZIF-8@Zn) anodes. Various MOF materials were synthesized and investigated as ZIB cathodes, and Mn(BTC) MOF was found to exhibit the best Zn2+-storage ability with a capacity of 112 mAh g-1. Zn2+ 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.


 

Keywords

Zinc-ion battery, Metal-organic framework, Cathode material, Zn anode

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