Improving the high-temperature performance of LiMn2O 4 spinel electrodes by coating the active mass with MgO via a sonochemical method

J. S. Gnanaraj, V. G. Pol, A. Gedanken, D. Aurbach

Research output: Contribution to journalArticlepeer-review

229 Scopus citations

Abstract

LiMn2O4 spinel coated sonochemically with MgO was studied as an active mass in composite cathodes in standard Li electrolyte solutions for Li-ion batteries at 60 °C. Solutions comprising 1 M LiPF 6 in a mixture of ethylene, dimethyl, and diethyl carbonates (EC-DMC-DEC; 2:2: 1) were used. It was possible to obtain LiMn2O 4 particles fully covered by porous magnesia films that allow a free transport of Li-ions. Electrodes comprising LiMn2O4, modified by MgO showed a higher capacity retention compared to the electrodes comprising an uncoated active mass, specially at elevated temperatures. We suggest that the presence of an MgO film on the surface of the LiMn 2O4 particles, reduces the detrimental effect of HF contamination present in LiPF6 solutions, reduces the electrodes' impedance and improves their kinetics.

Original languageEnglish
Pages (from-to)940-945
Number of pages6
JournalElectrochemistry Communications
Volume5
Issue number11
DOIs
StatePublished - Nov 2003

Bibliographical note

Funding Information:
Partial support for this work was obtained from the BMBF, the German Ministry of Science, in the framework of the DIP program for Collaboration Between Israeli and German Scientists, and by the EC in the framework of the fifth program (the NanoBatt project).

Funding

Partial support for this work was obtained from the BMBF, the German Ministry of Science, in the framework of the DIP program for Collaboration Between Israeli and German Scientists, and by the EC in the framework of the fifth program (the NanoBatt project).

FundersFunder number
German Ministry of Science
European Commission
Bundesministerium für Bildung und Forschung

    Keywords

    • DEC
    • DMC
    • EC
    • Impedance spectroscopy
    • Li-ion batteries
    • LiPF
    • MgO
    • Sonochemical coating
    • Spinel LiMnO electrodes
    • Surface films

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