Electrochemical Surface Analysis of LiMn2O4 Thin-film Electrodes in LiPF6/Propylene Carbonate at Room and Elevated Temperatures
Degradation of LiMn2O4 in LiPF6-based electrolyte solution is complicated due to the influence of PF6− anion. Decomposition of PF6− anion accelerates both of dissolution of manganese ion and surface-film formation. In this study, surface states of LiMn2O4 thin-film electrodes in LiPF6/propylene carb...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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The Electrochemical Society of Japan
2021-01-01
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| Series: | Electrochemistry |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/electrochemistry/89/1/89_20-00112/_pdf/-char/en |
| _version_ | 1797972036179460096 |
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| author | Junichi INAMOTO Tomokazu FUKUTSUKA Kohei MIYAZAKI Takeshi ABE |
| author_facet | Junichi INAMOTO Tomokazu FUKUTSUKA Kohei MIYAZAKI Takeshi ABE |
| author_sort | Junichi INAMOTO |
| collection | DOAJ |
| description | Degradation of LiMn2O4 in LiPF6-based electrolyte solution is complicated due to the influence of PF6− anion. Decomposition of PF6− anion accelerates both of dissolution of manganese ion and surface-film formation. In this study, surface states of LiMn2O4 thin-film electrodes in LiPF6/propylene carbonate (PC) derived from the surface-film formation were investigated using redox reaction of ferrocene and spectroscopic analyses. The spectroscopic analyses suggested that properties of the surface film depended the operation temperature (30 °C and 55 °C); a thinner surface film composed of LiF and PC decomposition products formed on LiMn2O4 at 30 °C and a thicker surface film was formed at 55 °C. The redox reaction of ferrocene clearly showed that LiMn2O4 was completely passivated at 30 °C, while it was partially passivated at 55 °C, indicating the surface film formed at 55 °C was not compact and LiMn2O4 was exposed to the electrolyte solution. It was one of the causes of the rapid degradation of LiMn2O4 at elevated temperatures in LiPF6-based electrolyte solution. |
| first_indexed | 2024-04-11T03:40:57Z |
| format | Article |
| id | doaj.art-539fa783c01d4c9592493a9176807851 |
| institution | Directory Open Access Journal |
| issn | 2186-2451 |
| language | English |
| last_indexed | 2024-04-11T03:40:57Z |
| publishDate | 2021-01-01 |
| publisher | The Electrochemical Society of Japan |
| record_format | Article |
| series | Electrochemistry |
| spelling | doaj.art-539fa783c01d4c9592493a91768078512023-01-02T03:40:14ZengThe Electrochemical Society of JapanElectrochemistry2186-24512021-01-01891192410.5796/electrochemistry.20-00112electrochemistryElectrochemical Surface Analysis of LiMn2O4 Thin-film Electrodes in LiPF6/Propylene Carbonate at Room and Elevated TemperaturesJunichi INAMOTO0Tomokazu FUKUTSUKA1Kohei MIYAZAKI2Takeshi ABE3Graduate School of Engineering, Kyoto UniversityGraduate School of Engineering, Kyoto UniversityGraduate School of Engineering, Kyoto UniversityGraduate School of Engineering, Kyoto UniversityDegradation of LiMn2O4 in LiPF6-based electrolyte solution is complicated due to the influence of PF6− anion. Decomposition of PF6− anion accelerates both of dissolution of manganese ion and surface-film formation. In this study, surface states of LiMn2O4 thin-film electrodes in LiPF6/propylene carbonate (PC) derived from the surface-film formation were investigated using redox reaction of ferrocene and spectroscopic analyses. The spectroscopic analyses suggested that properties of the surface film depended the operation temperature (30 °C and 55 °C); a thinner surface film composed of LiF and PC decomposition products formed on LiMn2O4 at 30 °C and a thicker surface film was formed at 55 °C. The redox reaction of ferrocene clearly showed that LiMn2O4 was completely passivated at 30 °C, while it was partially passivated at 55 °C, indicating the surface film formed at 55 °C was not compact and LiMn2O4 was exposed to the electrolyte solution. It was one of the causes of the rapid degradation of LiMn2O4 at elevated temperatures in LiPF6-based electrolyte solution.https://www.jstage.jst.go.jp/article/electrochemistry/89/1/89_20-00112/_pdf/-char/enlithium-ion batterieslimn2o4surface filmdegradation |
| spellingShingle | Junichi INAMOTO Tomokazu FUKUTSUKA Kohei MIYAZAKI Takeshi ABE Electrochemical Surface Analysis of LiMn2O4 Thin-film Electrodes in LiPF6/Propylene Carbonate at Room and Elevated Temperatures Electrochemistry lithium-ion batteries limn2o4 surface film degradation |
| title | Electrochemical Surface Analysis of LiMn2O4 Thin-film Electrodes in LiPF6/Propylene Carbonate at Room and Elevated Temperatures |
| title_full | Electrochemical Surface Analysis of LiMn2O4 Thin-film Electrodes in LiPF6/Propylene Carbonate at Room and Elevated Temperatures |
| title_fullStr | Electrochemical Surface Analysis of LiMn2O4 Thin-film Electrodes in LiPF6/Propylene Carbonate at Room and Elevated Temperatures |
| title_full_unstemmed | Electrochemical Surface Analysis of LiMn2O4 Thin-film Electrodes in LiPF6/Propylene Carbonate at Room and Elevated Temperatures |
| title_short | Electrochemical Surface Analysis of LiMn2O4 Thin-film Electrodes in LiPF6/Propylene Carbonate at Room and Elevated Temperatures |
| title_sort | electrochemical surface analysis of limn2o4 thin film electrodes in lipf6 propylene carbonate at room and elevated temperatures |
| topic | lithium-ion batteries limn2o4 surface film degradation |
| url | https://www.jstage.jst.go.jp/article/electrochemistry/89/1/89_20-00112/_pdf/-char/en |
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