Issue 12, 2022

Mg ion pre-intercalated MnO2 nanospheres as high-performance cathode materials for aqueous Zn-ion batteries

Abstract

Rechargeable Zn-MnO2 batteries with mild and nearly neutral aqueous electrolytes have shown great potential for large-scale energy storage because of their high safety, low cost, environmental friendliness and high energy density. However, MnO2 cathode materials usually have disadvantages such as low capacity and poor cycling stability, which limit the development of Zn-MnO2 batteries. In this study, mesoporous MnO2 nanospheres were prepared by in situ Mg ion pre-intercalation via a simple chemical method. The prepared MnO2 shows a high reversible capacity (247 mA h g−1 at 0.3 A g−1), excellent cycling stability (a capacity retention of 93% over 800 cycles at 0.8 A g−1) and good rate performance. The GITT, in situ EIS, ex situ XRD, ex situ XPS and ex situ SEM show that the zinc storage mechanism of MnO2 should be H+/Zn2+ co-intercalation/de-intercalation. This research could provide specific inspiration and promotion for the development and mechanism research of high-performance rechargeable Zn-MnO2 batteries.

Graphical abstract: Mg ion pre-intercalated MnO2 nanospheres as high-performance cathode materials for aqueous Zn-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
06 Jan 2022
Accepted
14 Feb 2022
First published
14 Feb 2022

Dalton Trans., 2022,51, 4695-4703

Mg ion pre-intercalated MnO2 nanospheres as high-performance cathode materials for aqueous Zn-ion batteries

P. Xu, H. Yi, G. Shi, Z. Xiong, Y. Hu, R. Wang, H. Zhang and B. Wang, Dalton Trans., 2022, 51, 4695 DOI: 10.1039/D2DT00047D

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