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Issue 34, 2015
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Tailoring the surface properties of LiNi0.4Mn0.4Co0.2O2 by titanium substitution for improved high voltage cycling performance

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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

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Publication details

The article was received on 04 Jun 2015, accepted on 29 Jul 2015 and first published on 30 Jul 2015


Article type: Communication
DOI: 10.1039/C5CP03228H
Author version available: Download Author version (PDF)
Citation: Phys. Chem. Chem. Phys., 2015,17, 21778-21781
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    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

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