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Superior potassium and zinc storage in K-doped VO2(B) spheres

Abstract

The abundant natural resources and low cost benefits of zinc-ion batteries (ZIBs) and potassium-ion batteries (KIBs) offer a better alternative to lithium-ion batteries (LIBs). Nevertheless, large radius of K+ and high charge density of Zn2+ lead to sluggish electrochemical kinetics and the development of appropriate electrode materials for KIBs and ZIBs is therefore very important. Herein, hierarchical K-doped brookite vanadium dioxide (K-VO2(B)) spheres prepared via a simple microwave-assisted hydrothermal approach are proposed. K-VO2(B) as an anode material for PIBs shows the enhanced electrochemical performance in terms of high capacity (~420 mA h g-1), exceptional rate capability and long-term cycling performance (500 cycles). For ZIBs, it also achieves a high capacity of 350 mA h g-1 at 500 mA g-1 and 122 mA h g-1 at an extremely high rate of 50 A g-1. The outstanding PIBs and ZIBs performance of the K-VO2(B) is mainly benefit from the improved ion diffusion coefficients after K-doping and the occurrence of inherently stable (de)intercalation reactions.

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Supplementary files

Article information


Submitted
29 Nov 2020
Accepted
15 Feb 2021
First published
18 Feb 2021

Mater. Chem. Front., 2021, Accepted Manuscript
Article type
Research Article

Superior potassium and zinc storage in K-doped VO2(B) spheres

Q. Li, X. Ye, Y. Jiang, H. Ang, W. Liu, Y. Feng, X. Rui and Y. Yu, Mater. Chem. Front., 2021, Accepted Manuscript , DOI: 10.1039/D0QM00990C

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