Quicker and More Zn2+ Storage Predominantly from the Interface

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

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Author(s)

  • Yuhang Dai
  • Xiaobin Liao
  • Ruohan Yu
  • Jinghao Li
  • Jiantao Li
  • Shuangshuang Tan
  • Pan He
  • Qinyou An
  • Qiulong Wei
  • Lineng Chen
  • Xufeng Hong
  • Kangning Zhao
  • Jinsong Wu
  • Yan Zhao
  • Liqiang Mai

Detail(s)

Original languageEnglish
Article number2100359
Journal / PublicationAdvanced Materials
Volume33
Issue number26
Online published17 May 2021
Publication statusPublished - 1 Jul 2021
Externally publishedYes

Abstract

Aqueous zinc-ion batteries are highly desirable for large-scale energy storage because of their low cost and high-level safety. However, achieving high energy and high power densities simultaneously is challenging. Herein, a VOx sub-nanometer cluster/reduced graphene oxide (rGO) cathode material composed of interfacial V-O-C bonds is artificially constructed. Therein, a new mechanism is revealed, where Zn2+ ions are predominantly stored at the interface between VOx and rGO, which causes anomalous valence changes compared to conventional mechanisms and exploits the storage ability of non-energy-storing active yet highly conductive rGO. Further, this interface-dominated storage triggers decoupled transport of electrons/Zn2+ ions, and the reversible destruction/reconstruction allows the interface to store more ions than the bulk. Finally, an ultrahigh rate capability (174.4 mAh g−1 at 100 A g−1, i.e., capacity retention of 39.4% for a 1000-fold increase in current density) and a high capacity (443 mAh g−1 at 100 mA g−1, exceeding the theoretical capacities of each interfacial component) are achieved. Such interface-dominated storage is an exciting way to build high-energy- and high-power-density devices.

Research Area(s)

  • aqueous zinc-ion batteries, decoupled electron/ion transport, heterostructures, interface pseudocapacitance, interface-dominated storage

Citation Format(s)

Quicker and More Zn2+ Storage Predominantly from the Interface. / Dai, Yuhang; Liao, Xiaobin; Yu, Ruohan et al.
In: Advanced Materials, Vol. 33, No. 26, 2100359, 01.07.2021.

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