Functional group differentiation of isomeric solvents enables distinct zinc anode chemistry

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Chao Liu
  • Yilun Lin
  • Yihan Yang
  • Cuiping Han
  • Haiyan Zhang

Detail(s)

Original languageEnglish
Article numbere9120064
Journal / PublicationNano Research Energy
Volume2
Issue number2
Online published10 Apr 2023
Publication statusPublished - Jun 2023

Link(s)

Abstract

Electrolytes hold the key to realizing reliable zinc (Zn) anodes. Divergent organic molecules have been proven effective in stabilizing Zn anodes; however, irrational comparisons exist due to the uncontrolled molecular weights and functional group amounts. In this work, two “isomeric molecules”: 1,2-dimethoxyethane (DME) and 1-methoxy-2-propanol (PM), with identical molecular weights but different functional groups, have been studied as co-solvents in electrolytes, which have delivered distinct electrochemical performance. Experimental and simulative study indicates the dipole moment induced by the hydroxyl groups in PM (higher molecular polarity than ether groups in DME) reconstructs the space charge region, enhances the concentration of Zn2+ in the vicinity of Zn anodes, and in-situ derives different solid electrolyte interphase (SEI) models and electrode–electrolyte interfaces, resulting in exceptional cycling stability. Remarkably, the Zn||Cu cell with PM worked over 2000 cycles with high Coulombic efficiency (CE) of 99.7%. The Zn||Zn symmetric cell cycled over 2000 h at 1 mA·cm−2, and showed excellent stability at an ultrahigh current density of 10 mA·cm−2 and capacity of 20 mAh·cm−2 over 200 h (depth of discharge, DOD of 70%). The Zn||sodium vanadate pouch cell with a high mass loading of 6.3 mg·cm−2 and a high capacity of 24 mAh demonstrates superior cyclability after 570 h. This work can be a good starting point to provide reliable guidance on electrolyte design for practical aqueous Zn batteries. © The Author(s) 2023.

Research Area(s)

  • functional group, isomeric solvents, solid electrolyte interphase (SEI) model, zinc anode

Citation Format(s)

Functional group differentiation of isomeric solvents enables distinct zinc anode chemistry. / Liu, Chao; Li, Qing; Lin, Yilun et al.
In: Nano Research Energy, Vol. 2, No. 2, e9120064, 06.2023.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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