Homogeneous Plating/Stripping Mode with Fine Grains for Highly Reversible Zn Anode

Zhen Luo, Yufan Xia, Shuang Chen, Xingxing Wu, Esther Akinlabi, Ben Bin Xu*, Hongge Pan, Mi Yan, Yinzhu Jiang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Aqueous zinc metal batteries (AZMBs) have emerged as an attractive energy storage option due to their operational safety, low cost, and environmental friendliness. However, the hexagonal close-packed (hcp) Zn anode always exhibits dendritic plating/stripping due to the uncontrollable nucleation and growth of hexagonal platelets, which severely bottlenecks their further development. Herein, we regulate both nucleation and Zn/Zn2+ redox kinetics to enable a homogeneous plating/stripping mode with fine grains, significantly improving the stability and reversibility of the Zn anode. Surface overpotential, which directly determines the nucleation behavior, is prominently amplified by the adsorption of added cordycepin (Cor) on the Zn anode surface. Therefore, a promoted nucleation process with the formation of small-sized Zn grains is achieved. While the mitigated Zn growth/dissolution rate caused by strong steric hinderance effect of Cor further ensures the granular morphology after cycling. Owing to this dual regulation strategy, the Zn anode delivers a superior cycling stability of the Zn||Zn symmetric cell over 900 h at 5 mA cm–2 and an ultra-high cumulative plating capacity of 3 Ah cm–2 at 10 mA cm–2. The concept also works in Zn||Cu asymmetric cells and Zn||NaV3O8"∙" 1.5H2O (NVO) full cells, facilitating excellent reversibility and cycling performance. This work presents a new mode for Zn plating/stripping, which will make highly reversible AZMBs achievable.
Original languageEnglish
JournalEnergy and Environmental Science
Publication statusAccepted/In press - 8 Jul 2024

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