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

doi:10.1016/j.elecom.2003.08.012

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

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

215 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 language	English
Pages (from-to)	940-945
Number of pages	6
Journal	Electrochemistry Communications
Volume	5
Issue number	11
DOIs	https://doi.org/10.1016/j.elecom.2003.08.012
State	Published - 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).

Keywords

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

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10.1016/j.elecom.2003.08.012

Cite this

@article{ee72300a505744248769d0ccbf41f32c,

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

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.",

keywords = "DEC, DMC, EC, Impedance spectroscopy, Li-ion batteries, LiPF, MgO, Sonochemical coating, Spinel LiMnO electrodes, Surface films",

author = "Gnanaraj, {J. S.} and Pol, {V. G.} and A. Gedanken and D. Aurbach",

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).",

year = "2003",

month = nov,

doi = "10.1016/j.elecom.2003.08.012",

language = "אנגלית",

volume = "5",

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journal = "Electrochemistry Communications",

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T1 - Improving the high-temperature performance of LiMn2O 4 spinel electrodes by coating the active mass with MgO via a sonochemical method

AU - Gnanaraj, J. S.

AU - Pol, V. G.

AU - Gedanken, A.

AU - Aurbach, D.

N1 - 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).

PY - 2003/11

Y1 - 2003/11

N2 - 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.

AB - 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.

KW - DEC

KW - DMC

KW - EC

KW - Impedance spectroscopy

KW - Li-ion batteries

KW - LiPF

KW - MgO

KW - Sonochemical coating

KW - Spinel LiMnO electrodes

KW - Surface films

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