A low concentration electrolyte additive for constructing solid–electrolyte interphase on a Zn metal anode for aqueous batteries

Literature Information

Publication Date 2024-01-10
DOI 10.1039/D3CC05272A
Impact Factor 6.222
Authors

Guoli Zhang, Jiaqi Zhu, Kuo Wang, Qianrui Li, Wenchao Fu


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Abstract

Zn metal anodes in aqueous batteries experience inhomogeneous deposition and corrosion issues. Herein, we introduced, at a low concentration, dioxane (DX) as an electrolyte additive to stabilize a Zn anode. The oxygen sites of DX endowed it with a strong affinity for Zn and Zn2+, resulting in its adsorption onto the Zn electrode surface and its coordination with Zn2+ locally. The Zn2+-DX species exhibited a decreased lowest unoccupied molecular orbital energy level relative to those of water-involved components. The DX additive not only inhibited side reactions but also generated a stable solid–electrolyte interphase on the Zn electrode, ensuring a uniform Zn deposition. As a result of including the additive, the cycle life of the Zn symmetric cell was extended from 99 h to 2100 h, and the coulombic efficiency in Zn//Cu cell reached 99.5%.

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