Issue 34, 2015

Tailoring the surface properties of LiNi0.4Mn0.4Co0.2O2 by titanium substitution for improved high voltage cycling performance

Abstract

The present study aims to provide insights into the behavior of LiNi0.4Mn0.4Co0.2O2 (NMC442) and LiNi0.4Mn0.4Co0.18Ti0.02O2 (NMC442-Ti02) cathode materials under galvanostatic cycling to high potentials, in the context of previous work which predicted that Ti-substituted variants should deliver higher capacities and exhibit better cycling stability than the unsubstituted compounds. It is found that NMC cathodes containing Ti show equivalent capacity fading but greater specific capacity than those without Ti in the same potential range. When repeatedly charged to the same degree of delithiation, NMC cathodes containing Ti showed better capacity retention. Soft X-ray absorption spectroscopy (XAS) spectra for Mn and Co indicated increased reduction in these elements for NMC cathodes without Ti, indicating that the substitution of Ti for Co acts to suppress the formation of a high impedance rock salt phase at the surface of NMC cathode particles. The results of this study validate the adoption of a facile change to existing NMC chemistries to improve cathode capacity retention under high voltage cycling conditions.

Graphical abstract: Tailoring the surface properties of LiNi0.4Mn0.4Co0.2O2 by titanium substitution for improved high voltage cycling performance

Supplementary files

Article information

Article type
Communication
Submitted
04 Jun 2015
Accepted
29 Jul 2015
First published
30 Jul 2015

Phys. Chem. Chem. Phys., 2015,17, 21778-21781

Author version available

Tailoring the surface properties of LiNi0.4Mn0.4Co0.2O2 by titanium substitution for improved high voltage cycling performance

S. Wolff-Goodrich, F. Lin, I. M. Markus, D. Nordlund, H. L. Xin, M. Asta and M. M. Doeff, Phys. Chem. Chem. Phys., 2015, 17, 21778 DOI: 10.1039/C5CP03228H

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