Issue 10, 2018

Zero-strain K0.6Mn1F2.7 hollow nanocubes for ultrastable potassium ion storage

Abstract

Potassium-ion batteries (KIBs) are an attractive energy storage system due to their advantages of low cost and abundant potassium resources. However, their rapid development is greatly impeded by their low capacity and poor stability, due in particular to their much larger volumetric expansion compared to transition metal lithium-ion batteries. Herein, we report a new etching route to fabricate a new class of zero-strain potassium fluoromanganate hollow nanocubes (KMnF-NCs) for boosting the performance of KIBs in terms of capacity, rate capability and cycling stability. The as-made KMnF-NCs containing rich K and F vacancies exhibit a high capacity and super high stability by showing a specific capacity of 110 mA h gāˆ’1 even after 10ā€†000 cycles, which is the best stability for KIBs. In situ X-ray diffraction and the first-principles calculations reveal a new storage mechanism for KIBs, in which the intercalation/deintercalation of K ions into/from the K and F vacancies (as a battery behavior) and the adsorption/desorption onto/from the surface (as a pseudocapacitance characteristic) are the key to increasing the capacity of KIBs. Most importantly, we found that during the discharge process, the volume expansion of the etched KMnF-NC was only 1.4%, which is much lower as compared to well-known negative materials, showing great potential as a new class of high-performance zero-strain negative materials for KIBs.

Graphical abstract: Zero-strain K0.6Mn1F2.7 hollow nanocubes for ultrastable potassium ion storage

Supplementary files

Article information

Article type
Paper
Submitted
04 Jun 2018
Accepted
07 Aug 2018
First published
07 Aug 2018

Energy Environ. Sci., 2018,11, 3033-3042

Zero-strain K0.6Mn1F2.7 hollow nanocubes for ultrastable potassium ion storage

Z. Liu, P. Li, G. Suo, S. Gong, W. (. Wang, C. Lao, Y. Xie, H. Guo, Q. Yu, W. Zhao, K. Han, Q. Wang, M. Qin, K. Xi and X. Qu, Energy Environ. Sci., 2018, 11, 3033 DOI: 10.1039/C8EE01611A

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