Issue 7, 2021

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, the 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 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 PIB and ZIB performance of the K–VO2(B) is mainly benefitted from the improved ion diffusion coefficients after K-doping and the occurrence of inherently stable (de)intercalation reactions.

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

Supplementary files

Article information

Article type
Research Article
Submitted
29 nov. 2020
Accepted
15 févr. 2021
First published
18 févr. 2021

Mater. Chem. Front., 2021,5, 3132-3138

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

Q. Li, X. Ye, Y. Jiang, E. H. Ang, W. Liu, Y. Feng, X. Rui and Y. Yu, Mater. Chem. Front., 2021, 5, 3132 DOI: 10.1039/D0QM00990C

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