Issue 42, 2018

Role of disorder in limiting the true multi-electron redox in ε-LiVOPO4

Abstract

Recent advances in materials syntheses have enabled ε-LiVOPO4 to deliver capacities approaching, and in some cases exceeding the theoretical value of 305 mA h g−1 for 2Li intercalation, despite its poor electronic and ionic conductivity. However, not all of the capacity corresponds to the true electrochemical intercalation/deintercalation reactions as evidenced upon systematic tracking of V valence through combined operando and rate-dependent ex situ X-ray absorption study presented herein. Structural disorder and defects introduced in the material by high-energy ball milling impede kinetics of the high-voltage V5+/V4+ redox more severely than the low-voltage V4+/V3+ redox, promoting significant side reaction contributions in the high-voltage region, irrespective of cycling conditions. The present work emphasizes the need for nanoengineering of active materials without compromising their bulk structural integrity in order to fully utilize high-energy density of multi-electron cathode materials.

Graphical abstract: Role of disorder in limiting the true multi-electron redox in ε-LiVOPO4

Supplementary files

Article information

Article type
Paper
Submitted
05 Jūl. 2018
Accepted
07 Sept. 2018
First published
17 Sept. 2018

J. Mater. Chem. A, 2018,6, 20669-20677

Author version available

Role of disorder in limiting the true multi-electron redox in ε-LiVOPO4

J. Rana, Y. Shi, M. J. Zuba, K. M. Wiaderek, J. Feng, H. Zhou, J. Ding, T. Wu, G. Cibin, M. Balasubramanian, F. Omenya, N. A. Chernova, K. W. Chapman, M. S. Whittingham and L. F. J. Piper, J. Mater. Chem. A, 2018, 6, 20669 DOI: 10.1039/C8TA06469E

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