In Situ Assessment of LiMn2O4 Degradation during Prolonged Exposure in Carbonate-Based Electrolytes

Mohamed Mohamedi; Naomi Anzue; Kaoru Dokko; Takashi Itoh; Isamu Uchida

doi:10.5796/electrochemistry.71.1168

In Situ Assessment of LiMn₂O₄ Degradation during Prolonged Exposure in Carbonate-Based Electrolytes

Mohamed Mohamedi, Naomi Anzue, Kaoru Dokko, Takashi Itoh, Isamu Uchida

Advanced Interdisciplinary Research Division

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

1 Citation (Scopus)

Abstract

The degradations of thin-film LiMn₂O₄ electrodes during prolonged exposure to 1 M LiPF₆/EC-DMC at room temperature and 55°C, were assessed by in situ Raman spectroscopy. Our results demonstrate that different deterioration mechanisms of the spinel were found depending on the temperature. Exposure of a thin-film spinel LiMn ₂O₄ electrode to LiPF₆/EC-DMC electrolyte at room temperature and 55°C led to spontaneous formation of a thin insulating surface layer. This process is accompanied by the transformation of the LiMn₂O₄ electrode surface into λ-MnO₂ and Mn₂O₃ at room temperature and 55°C, respectively.

Original language	English
Pages (from-to)	1168-1171
Number of pages	4
Journal	Electrochemistry
Volume	71
Issue number	12
DOIs	https://doi.org/10.5796/electrochemistry.71.1168
Publication status	Published - 2003 Dec

Keywords

Carbonate-Based Electrolytes
Degradation
Elevated Temperatures
Lithium Manganese Oxide

ASJC Scopus subject areas

Electrochemistry

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title = "In Situ Assessment of LiMn2O4 Degradation during Prolonged Exposure in Carbonate-Based Electrolytes",

abstract = "The degradations of thin-film LiMn2O4 electrodes during prolonged exposure to 1 M LiPF6/EC-DMC at room temperature and 55°C, were assessed by in situ Raman spectroscopy. Our results demonstrate that different deterioration mechanisms of the spinel were found depending on the temperature. Exposure of a thin-film spinel LiMn 2O4 electrode to LiPF6/EC-DMC electrolyte at room temperature and 55°C led to spontaneous formation of a thin insulating surface layer. This process is accompanied by the transformation of the LiMn2O4 electrode surface into λ-MnO2 and Mn2O3 at room temperature and 55°C, respectively.",

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author = "Mohamed Mohamedi and Naomi Anzue and Kaoru Dokko and Takashi Itoh and Isamu Uchida",

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AU - Mohamedi, Mohamed

AU - Anzue, Naomi

AU - Dokko, Kaoru

AU - Itoh, Takashi

AU - Uchida, Isamu

PY - 2003/12

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N2 - The degradations of thin-film LiMn2O4 electrodes during prolonged exposure to 1 M LiPF6/EC-DMC at room temperature and 55°C, were assessed by in situ Raman spectroscopy. Our results demonstrate that different deterioration mechanisms of the spinel were found depending on the temperature. Exposure of a thin-film spinel LiMn 2O4 electrode to LiPF6/EC-DMC electrolyte at room temperature and 55°C led to spontaneous formation of a thin insulating surface layer. This process is accompanied by the transformation of the LiMn2O4 electrode surface into λ-MnO2 and Mn2O3 at room temperature and 55°C, respectively.

AB - The degradations of thin-film LiMn2O4 electrodes during prolonged exposure to 1 M LiPF6/EC-DMC at room temperature and 55°C, were assessed by in situ Raman spectroscopy. Our results demonstrate that different deterioration mechanisms of the spinel were found depending on the temperature. Exposure of a thin-film spinel LiMn 2O4 electrode to LiPF6/EC-DMC electrolyte at room temperature and 55°C led to spontaneous formation of a thin insulating surface layer. This process is accompanied by the transformation of the LiMn2O4 electrode surface into λ-MnO2 and Mn2O3 at room temperature and 55°C, respectively.

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