Issue 2, 2022

Self-templated construction of peanut-like P3-type K0.45Mn0.5Co0.5O2 for highly reversible potassium storage

Abstract

Potassium-ion batteries (PIBs) as energy storage devices show great development potential in the field of large-scale energy storage on account of their abundant potassium resources, rapid K+ mobility in electrolyte, and low potential of K. However, the commercial application of PIBs is greatly hindered by the shortage of suitable cathode materials that can withstand the stress arising from larger K+ (de)insertion. In this work, a layered P3-type K0.45Mn0.5Co0.5O2 cathode with a peanut-shaped hierarchical structure (denoted as p-KMCO) is synthesized via an elegant self-templating method for PIBs. Benefiting from the synergistic effect of the unique hierarchical architecture, it can reduce the contact area with the electrolyte, accelerate the K+ diffusion kinetics, and alleviate the structural strain arising from repetitive K+ insertion/extraction. As a result, the as-obtained p-KMCO delivers a high reversible capacity of 123.2 mA h g−1 at 20 mA g−1, improved rate capability of 66.8 mA h g−1 at 300 mA g−1, and long-term cycling stability (73.8% capacity retention over 300 cycles). Moreover, the p-KMCO//pitch-derived soft carbon K-ion full cell also exhibits satisfactory rate performance and cycling stability.

Graphical abstract: Self-templated construction of peanut-like P3-type K0.45Mn0.5Co0.5O2 for highly reversible potassium storage

Supplementary files

Article information

Article type
Communication
Submitted
13 11 2021
Accepted
07 12 2021
First published
07 12 2021

J. Mater. Chem. A, 2022,10, 554-560

Self-templated construction of peanut-like P3-type K0.45Mn0.5Co0.5O2 for highly reversible potassium storage

Z. Zhang, J. Sun, L. Duan, Y. Du, J. Li, J. Shen and X. Zhou, J. Mater. Chem. A, 2022, 10, 554 DOI: 10.1039/D1TA09739C

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