A High-Energy Four-Electron Zinc Battery Enabled by Evoking Full Electrochemical Activity in Copper Sulfide Electrode

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

3 Scopus Citations
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Author(s)

  • Shizhen Li
  • Jinlong Yang
  • Guangming Chen
  • Zhuoxin Liu

Detail(s)

Original languageEnglish
Pages (from-to)22478-22487
Journal / PublicationACS Nano
Volume17
Issue number22
Online published7 Nov 2023
Publication statusPublished - 28 Nov 2023

Abstract

The growing global demand for sustainable and cost-effective energy storage solutions has driven the rapid development of zinc batteries. Despite significant progress in recent years, enhancing the energy density of zinc batteries remains a crucial research focus. One prevalent strategy involves the development of high-capacity and/or high-voltage cathode materials. CuS, a commonly used electrode material, exhibits a two-electron transfer mechanism; however, the reduced sulfion lacks electrochemical activity and thereby limits its discharge capacity and redox potential. In this study, we activate a CuS cathode to form a high-valence Cu2+&S compound using a deep-eutectic-solvent (DES)-based electrolyte. The presence of Cl- in the DES-based electrolyte is crucial to the reversibility of the redox chemistry, and the liquid-phase-involved electrochemical process facilitates redox kinetics. A four-electron transfer pathway involving five reaction steps is identified for the CuS electrode, which unleashes the full electrochemical activity of the S element. Consequently, the full cell delivers a large discharge capacity of ∼800 mAh g-1 at 0.2 A g-1 and yields a high discharge plateau starting at 1.58 V, contributing to energy densities of up to 650 Wh kg-1 (based on CuS). This work offers a promising approach to developing high-energy zinc batteries. © 2023 American Chemical Society.

Research Area(s)

  • aqueous batteries, deep eutectic solution, energy storage, high voltage, zinc batteries

Citation Format(s)

A High-Energy Four-Electron Zinc Battery Enabled by Evoking Full Electrochemical Activity in Copper Sulfide Electrode. / Li, Shizhen; Wei, Zhiquan; Yang, Jinlong et al.
In: ACS Nano, Vol. 17, No. 22, 28.11.2023, p. 22478-22487.

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