Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 19, 2019
Previous Article Next Article

Fundamental insights about interlayer cation migration in Li-ion electrodes at high states of charge

Author affiliations

Abstract

One approach to increasing the capacity of Li-ion batteries is to expand the usable voltage range over which the battery is cycled by charging the cathode to higher voltages. Layered intercalation compounds commonly used as cathodes in Li-ion batteries, however, can become susceptible to irreversible structural changes at high states of charge due to cation migration to the emptied Li layers. Here we report on the discovery of a strong correlation between the position of the Fermi level and the energy barrier for cation migration to the Li layers of fully charged layered intercalation compounds. Since the identity of the transition metal strongly influences the Fermi level, this discovery suggests that cation migration can be suppressed at high states of charge using targeted alloying strategies. First-principles calculations indicate that an increase in the concentration of Ni relative to Co or Mn should reduce, or even impede, interlayer migration in layered oxides. The insights of this study pave the way for the discovery of layered intercalation compounds that can approach their theoretical capacities in practice.

Graphical abstract: Fundamental insights about interlayer cation migration in Li-ion electrodes at high states of charge

Back to tab navigation

Supplementary files

Article information


Submitted
02 Apr 2019
Accepted
11 Apr 2019
First published
11 Apr 2019

J. Mater. Chem. A, 2019,7, 11996-12007
Article type
Paper
Author version available

Fundamental insights about interlayer cation migration in Li-ion electrodes at high states of charge

J. Vinckevičiūtė, M. D. Radin, N. V. Faenza, G. G. Amatucci and A. Van der Ven, J. Mater. Chem. A, 2019, 7, 11996
DOI: 10.1039/C9TA03460A

Social activity

Search articles by author

Spotlight

Advertisements