The study of LiNi0.5Mn1.5O4 5-V cathodes for Li-ion batteries

Y. Talyosef, B. Markovsky, G. Salitra, D. Aurbach, H. J. Kim, S. Choi

Research output: Contribution to journalArticlepeer-review

144 Scopus citations

Abstract

In this work, we studied cycling and storage behavior at elevated temperatures of substituted spinel-nickel electrodes LiNixMn 2-xO4 (x = 0.5) that can operate as cathodes in 5-V advanced lithium-ion batteries. A stable electrochemical performance and low capacity fading were found upon cycling and storage (charged state) of LiNi 0.5Mn1.5O4 electrodes in DMC-EC/LiPF 6 solutions at elevated temperatures (60 °C). It was established that cycling/storage of these electrodes led to dissolution of manganese and nickel and reduction of Mn2+ and Ni2+ on the lithium counter electrode. These phenomena were studied by solution analysis (ICP) and surface chemistry and morphological measurements (ex situ X-ray photoelectron and Raman spectroscopies, and SEM) of the lithium and LiNi0.5Mn 1.5O4 electrodes. Since these electrodes perform well during prolonged cycling, it is clear that the above changes relate to surface phenomena and not changes in the bulk of the active mass.

Original languageEnglish
Pages (from-to)664-669
Number of pages6
JournalJournal of Power Sources
Volume146
Issue number1-2
DOIs
StatePublished - 26 Aug 2005

Keywords

  • Charge-discharge cycling
  • Elevated temperatures
  • LiNiMnO cathodes
  • Lithium batteries
  • Metals dissolution
  • Storage

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