Aqueous MnV2O6-Zn Battery with High Operating Voltage and Energy Density

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Yan Wu
  • Yifan Li
  • Lina Chen
  • Xiaohang Lin
  • Zhongqiu Tong
  • Hui Wang

Detail(s)

Original languageEnglish
Article number2008182
Number of pages9
Journal / PublicationSmall
Volume17
Issue number28
Online published9 Jun 2021
Publication statusPublished - 15 Jul 2021

Abstract

Aqueous Zn ion batteries (AZIBs), featuring low cost, long-term cycling stability, and superior safety are promising for applications in advanced energy storage devices. However, they still suffer from unsatisfactory energy density and operating voltage, which are closely related to cathode materials used. Herein, the use of monoclinic MnV2O6 (MVO) is reported, which can be activated for high-capacity Zn ions storage by electrochemically oxidizing part of the Mn2+ to Mn3+ or Mn4+ while the remaining Mn2+ ions act as binders/pillars to hold the layer structure of MVO and maintain its integrity during charging/discharging process. Moreover, after introducing carbon nanotubes (CNT), the MVO:CNT composite not only provides robust 3D Zn-ion diffusion channels but also shows enhanced structural integrity. As a result, a MVO:CNT cathode delivers a high midpoint voltage (1.38 V after 3000 cycles at 2 A g-1) and a high energy density of 597.9 W h kg-1. Moreover, DFT analyses clearly illustrate stepwise Zn ion insertion into the MnV2O6 lattice, and ex-situ analyses results further verify the highly structural reversibility of the MnV2O6 cathode upon extended cycling, demonstrating the good potential of MnV2O6 for the establishment of viable aqueous Zn ion battery systems.

Research Area(s)

  • aqueous Zn ion batteries, cathode materials, electrochemical oxidation, high energy density, high operating voltage, MnV2O6, CARBON NANOTUBES, ION, SPECTRA, CATHODE, ANODE

Citation Format(s)

Aqueous MnV2O6-Zn Battery with High Operating Voltage and Energy Density. / Wu, Yan; Zhu, Zhaohua; Li, Yifan; Shen, Dong; Chen, Lina; Kang, Tianxing; Lin, Xiaohang; Tong, Zhongqiu; Wang, Hui; Lee, Chun-sing.

In: Small, Vol. 17, No. 28, 2008182, 15.07.2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review