Issue 12, 2024

In situ Nafion-nanofilm oriented (002) Zn electrodeposition for long-term zinc-ion batteries

Abstract

Dendrite growth and parasitic reactions of a Zn metal anode in aqueous media hinder the development of up-and-coming Zn-ion batteries. Optimizing the crystal growth after Zn nucleation is promising to enable stable cyclic performance of the anode, but directly regulating specific crystal plane growth for homogenized Zn electrodeposition remains highly challenging. Herein, a perfluoropolymer (Nafion) is introduced into an aqueous electrolyte to activate a thermodynamically ultrastable Zn/electrolyte interface for long-term Zn-ion batteries. The low adsorption energy (−2.09 eV) of Nafion molecules on Zn metal ensures the in situ formation of a Nafion-nanofilm during the first charge process. This ultrathin artificial solid electrolyte interface with zincophilic –SO3 groups guides the directional Zn2+ electrodeposition along the (002) crystal surface even at high current density, yielding a dendrite-free Zn anode. The synergic Zn/electrolyte interphase electrochemistry contributes an average coulombic efficiency of 99.71% after 4500 cycles for Zn‖Cu cells, and Zn‖Zn cells achieve an ultralong lifespan of over 7000 h at 5 mA cm−2. Besides, Zn‖MnO2 cells operate well over 3000 cycles. Even at −40 °C, Zn‖Zn cells achieve stable Zn2+ plating/stripping for 1200 h.

Graphical abstract: In situ Nafion-nanofilm oriented (002) Zn electrodeposition for long-term zinc-ion batteries

Supplementary files

Article information

Article type
Edge Article
Submitted
25 Dec 2023
Accepted
20 Feb 2024
First published
22 Feb 2024
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2024,15, 4322-4330

In situ Nafion-nanofilm oriented (002) Zn electrodeposition for long-term zinc-ion batteries

D. Zhang, Z. Song, L. Miao, Y. Lv, L. Gan and M. Liu, Chem. Sci., 2024, 15, 4322 DOI: 10.1039/D3SC06935D

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