Constructing a supersaturated electrolyte front surface for stable rechargeable aqueous zinc batteries.

By Huijun Yang, Z. Chang, Y. Qiao, Han Deng, Xiaowei Mu, P. He, Haoshen Zhou. Angewandte Chemie, 2020

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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 electrodeposit of metallic Zn critically harassed their further development. Herein, metal-organic framework (MOF) was constructed as front surface layer to maintain a supersaturated electrolyte layer on Zn anode. Raman spectroscopy indicated that the highly-coordinated ion complexes migrating through MOF channels were different from the solvation structure in bulk electrolyte. Benefited from the unique supersaturated front surface, symmetric Zn cells survived up to 3000 hours at 0.5 mA cm -2 , near 55 times of bare Zn anodes. The electrodeposit of Zn turned into round-edged and dense-packed mode with less side-product accumulating. Moreover, aqueous MnO 2 -Zn batteries delivered reversible capacity of 180.3 mAh g -1 and high capacity retention of 88.9% after 600 cycles with MnO 2 mass loading up to 4.2 mg cm -2 . This work provides a promising approach to realize supersaturated inner layer and safe Zn batteries.

Subfields: Biomedical Engineering, Electrical and Electronic Engineering, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/9a13a889ede12eb7a7de4d0b6aa811c5cdc28cb9