Manipulating Electric Double Layer Adsorption for Stable Solid-Electrolyte Interphase in 2.3 Ah Zn-Pouch Cells

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

79 Scopus Citations
View graph of relations

Detail(s)

Original languageEnglish
Article numbere202302583
Journal / PublicationAngewandte Chemie - International Edition
Volume62
Issue number23
Online published31 Mar 2023
Publication statusPublished - 5 Jun 2023

Abstract

Constructing a reliable solid-electrolyte interphase (SEI) is imperative for enabling highly reversible zinc metal (Zn0) electrodes. Contrary to conventional “bulk solvation” mechanism, we found the SEI structure is dominated by electric double layer (EDL) adsorption. We manipulate the EDL adsorption and Zn2+ solvation with ether additives (i.e. 15-crown-5, 12-crown-4, and triglyme). The 12-crown-4 with medium adsorption on EDL leads to a layer-structured SEI with inner inorganic ZnFx/ZnSx and outer organic C−O−C components. This structure endows SEI with high rigidness and strong toughness enabling the 100 cm2 Zn||Zn pouch cell to exhibit a cumulative capacity of 4250 mAh cm−2 at areal-capacity of 10 mAh cm−2. More importantly, a 2.3 Ah Zn||Zn0.25V2O5⋅n H2O pouch cell delivers a recorded energy density of 104 Wh Lcell−1 and runs for >70 days under the harsh conditions of low negative/positive electrode ratio (2.2 : 1), lean electrolyte (8 g Ah−1), and high-areal-capacity (≈13 mAh cm−2). © 2023 Wiley-VCH GmbH.

Research Area(s)

  • Bulk Solvation, Crown Ether, Electric Double Layer, Pouch Cell, Zn Anode

Citation Format(s)