Issue 4, 2021

Tuning the electronic structure of layered vanadium pentoxide by pre-intercalation of potassium ions for superior room/low-temperature aqueous zinc-ion batteries

Abstract

Aqueous zinc-ion batteries (ZIBs), due to their sluggish Zn2+ diffusion kinetics, continue to face challenges in terms of achieving superior high rate, long-term cycling and low-temperature properties. Herein, K+ pre-intercalated layered V2O5 (K0.5V2O5) composites with metallic features are capable of delivering excellent zinc storage performance. Specifically, the K0.5V2O5 electrode delivers a high reversible capacity of 251 mA h g−1 at 5 A g−1 after 1000 cycles. Even at a low temperature of −20 °C, high reversible capacities of 241 and 115 mA h g−1 can be obtained after 1000 cycles at 1 and 5 A g−1, respectively. The outstanding electrochemical performance is attributed to the incorporation of K+ into the layered V2O5, which acts as pillars to promote the Zn2+ diffusion and increase the structural stability during cycling. Density functional theory calculations demonstrate that the interlayer doping of K+ can benefit electron migration, and therefore enhance the Zn2+ (de)intercalation kinetics. Meanwhile, the Zn2+ storage mechanism of K0.5V2O5 is revealed by ex situ X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy characterization. This work may pave the way for exploiting high-performance cathodes for aqueous ZIBs.

Graphical abstract: Tuning the electronic structure of layered vanadium pentoxide by pre-intercalation of potassium ions for superior room/low-temperature aqueous zinc-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
14 out 2020
Accepted
04 jan 2021
First published
04 jan 2021

Nanoscale, 2021,13, 2399-2407

Tuning the electronic structure of layered vanadium pentoxide by pre-intercalation of potassium ions for superior room/low-temperature aqueous zinc-ion batteries

G. Su, S. Chen, H. Dong, Y. Cheng, Q. Liu, H. Wei, E. H. Ang, H. Geng and C. C. Li, Nanoscale, 2021, 13, 2399 DOI: 10.1039/D0NR07358J

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