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Oxygen Vacancies and Ordering of d‐levels Control Voltage Suppression in Oxide Cathodes: the Case of Spinel LiNi 0.5 Mn 1.5 O 4‐ δ

Oxygen Vacancies and Ordering of d‐levels Control Voltage Suppression in Oxide Cathodes: the Case... This study presents a microscopic model for the correlation between the concentration of oxygen vacancies and voltage suppression in high voltage spinel cathodes for Li‐ion batteries. Using first principles simulations, it is shown that neutral oxygen vacancies in LiNi0.5Mn1.5O4‐δ promote substitutional Ni/Mn disorder and the formation of Ni‐rich and Ni‐poor regions. The former trap oxygen vacancies, while the latter trap electrons associated with these vacancies. This leads to the creation of deep and shallow Mn3+ states and affects the stability of the lattice Li ions. Together, these two factors result in a characteristic profile of the voltage dependence on Li content. This insight provides guidance for mitigating the voltage suppression in LiNi0.5Mn1.5O4 and other cathodes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Functional Materials Wiley

Oxygen Vacancies and Ordering of d‐levels Control Voltage Suppression in Oxide Cathodes: the Case of Spinel LiNi 0.5 Mn 1.5 O 4‐ δ

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References (52)

Publisher
Wiley
Copyright
Copyright © 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN
1616-301X
eISSN
1616-3028
DOI
10.1002/adfm.201301205
Publisher site
See Article on Publisher Site

Abstract

This study presents a microscopic model for the correlation between the concentration of oxygen vacancies and voltage suppression in high voltage spinel cathodes for Li‐ion batteries. Using first principles simulations, it is shown that neutral oxygen vacancies in LiNi0.5Mn1.5O4‐δ promote substitutional Ni/Mn disorder and the formation of Ni‐rich and Ni‐poor regions. The former trap oxygen vacancies, while the latter trap electrons associated with these vacancies. This leads to the creation of deep and shallow Mn3+ states and affects the stability of the lattice Li ions. Together, these two factors result in a characteristic profile of the voltage dependence on Li content. This insight provides guidance for mitigating the voltage suppression in LiNi0.5Mn1.5O4 and other cathodes.

Journal

Advanced Functional MaterialsWiley

Published: Nov 26, 2013

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