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Vol. 13 (2021)

Enhanced Reversible Zinc Ion Intercalation in Deficient Ammonium Vanadate for High-Performance Aqueous Zinc-Ion Battery

https://doi.org/10.1007/s40820-021-00641-3
Quan Zong
Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195, USA
Wei Du
School of Materials Science and Engineering, State Key Lab Silicon Mat, Zhejiang University, Hangzhou 310027, People’s Republic of China
Chaofeng Liu
Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195, USA
Hui Yang
School of Materials Science and Engineering, State Key Lab Silicon Mat, Zhejiang University, Hangzhou 310027, People’s Republic of China
Qilong Zhang
School of Materials Science and Engineering, State Key Lab Silicon Mat, Zhejiang University, Hangzhou 310027, People’s Republic of China
Zheng Zhou
School of Materials Science and Engineering, State Key Lab Silicon Mat, Zhejiang University, Hangzhou 310027, People’s Republic of China
Muhammad Atif
Research Chair On Laser Diagnosis of Cancers, Department of Physics and Astronomy, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
Mohamad Alsalhi
Research Chair On Laser Diagnosis of Cancers, Department of Physics and Astronomy, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
Guozhong Cao
Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195, USA

Corresponding Author: Guozhong Cao

gzcao@uw.edu

Nano-Micro Letters, Vol. 13 (2021), Article Number: 116

Abstract

Ammonium vanadate with bronze structure (NH4V4O10) is a promising cathode material for zinc-ion batteries due to its high specific capacity and low cost. However, the extraction of NH+4 at a high voltage during charge/discharge processes leads to irreversible reaction and structure degradation. In this work, partial NH+4 ions were pre-removed from NH4V4O10 through heat treatment; NH4V4O10 nanosheets were directly grown on carbon cloth through hydrothermal method. Deficient NH4V4O10 (denoted as NVO), with enlarged interlayer spacing, facilitated fast zinc ions transport and high storage capacity and ensured the highly reversible electrochemical reaction and the good stability of layered structure. The NVO nanosheets delivered a high specific capacity of 457 mAh g−1 at a current density of 100 mA g−1 and a capacity retention of 81% over 1000 cycles at 2 A g−1. The initial Coulombic efficiency of NVO could reach up to 97% compared to 85% of NH4V4O10 and maintain almost 100% during cycling, indicating the high reaction reversibility in NVO electrode.


Highlights:


1 The partial removal of ammonium cations from ammonium vanadate results in an expanded interplanar space.
2 The deficient ammonium vanadate exhibits highly reversible redox reaction.
3 Ex situ characterizations suggest the reversible Zn3V2O7(OH)2·2H2O formation/decomposition in deficient ammonium vanadate during charge/discharge processes.

Keywords

Deficient ammonium vanadate Large interlayer spacing Reversible redox reaction Electrochemical mechanism
Zong, Quan, Wei Du, Chaofeng Liu, Hui Yang, Qilong Zhang, Zheng Zhou, Muhammad Atif, Mohamad Alsalhi, and Guozhong Cao. 2021. “Enhanced Reversible Zinc Ion Intercalation in Deficient Ammonium Vanadate for High-Performance Aqueous Zinc-Ion Battery”. Nano-Micro Letters 13 (April):116. https://doi.org/10.1007/s40820-021-00641-3.
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