Issue 41, 2019

Cryptomelane K1.33Mn8O16 as a cathode for rechargeable aqueous zinc-ion batteries

Abstract

Aqueous rechargeable zinc-ion batteries have immense commercial potential in the primary battery market, which is largely occupied by alkaline zinc/manganese oxide batteries. These storage systems are desirable for large-scale applications due to their superior safety, high capacity, fast ionic conductivity and low cost. Pursuing new Mn-based cathodes for Zn-ion batteries, cryptomelane with a specific chemical composition of K1.33Mn8O16 was synthesized using a simple sonochemical technique. The formation of phase pure tetragonal K1.33Mn8O16 with I4/m symmetry was confirmed by X-ray diffraction. When tested as a cathode for Zn-ion batteries, cryptomelane K1.33Mn8O16 demonstrated a high reversible capacity of 312 mA h g−1 at a rate of C/10. Robust cycling stability was observed retaining more than 80% of initial capacity after 650 cycles with ∼99% coulombic efficiency. The intercalation chemistry of Zn–MnO2 systems is very rich involving polymorphism and phase transformations during charge/discharge cycles. Synergizing ex situ X-ray diffraction and spectroscopy with the electrochemical titration technique, we have examined the detailed mechanism of (de)intercalation of Zn2+ into cryptomelane K1.33Mn8O16, which is proposed as a potential cathode for Zn-ion batteries.

Graphical abstract: Cryptomelane K1.33Mn8O16 as a cathode for rechargeable aqueous zinc-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
31 geg. 2019
Accepted
29 liep. 2019
First published
29 liep. 2019

J. Mater. Chem. A, 2019,7, 23981-23988

Cryptomelane K1.33Mn8O16 as a cathode for rechargeable aqueous zinc-ion batteries

K. Sada, B. Senthilkumar and P. Barpanda, J. Mater. Chem. A, 2019, 7, 23981 DOI: 10.1039/C9TA05836B

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements