Interfacial Stability of PEO Polymer Electrolyte with 4V-class LiNi0.6Mn0.2Co0.2O2 Cathode Coated with Various Inorganic Materials
PEO-based solid polymer electrolytes (SPEs) exhibit a narrow potential window and undergo decomposition when in contact with 4V-class cathode active materials. The objective of this study was to investigate the stability of the contact interface between the PEO electrolyte and the positive electrode...
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The Electrochemical Society of Japan
2025-06-01
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| Series: | Electrochemistry |
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| Online Access: | https://www.jstage.jst.go.jp/article/electrochemistry/93/6/93_25-71016/_html/-char/en |
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| author | Hiroya SAHASHI Sou TAMINATO Daisuke MORI Yasuo TAKEDA Osamu YAMAMOTO Nobuyuki IMANISHI Kazuma HANAI Keisuke NOMURA Shinichi KUMAKURA |
| author_facet | Hiroya SAHASHI Sou TAMINATO Daisuke MORI Yasuo TAKEDA Osamu YAMAMOTO Nobuyuki IMANISHI Kazuma HANAI Keisuke NOMURA Shinichi KUMAKURA |
| author_sort | Hiroya SAHASHI |
| collection | DOAJ |
| description | PEO-based solid polymer electrolytes (SPEs) exhibit a narrow potential window and undergo decomposition when in contact with 4V-class cathode active materials. The objective of this study was to investigate the stability of the contact interface between the PEO electrolyte and the positive electrode material, coated with various inorganic compounds on the surface. The time variation for the impedance of the interface between the PEO-based SPE and the LiNi0.6Mn0.2Co0.2O2 (NMC) coated with various inorganic compounds was measured. The following coated materials were tested: the ionic crystal LiF, the covalent oxide Al2O3, the ferroelectrics BaTiO3 and LiNbO3, the lithium ion conductor La0.45Li0.45TiO3 (LLTO), and the ferromagnetic and highly electron conductive La0.7Sr0.3MnO3 (LSMO). They were coated on the surface of NMC electrode using the sputtering method. The impedance of the Li/SPE/coated NMC cell was measured while maintaining a potential of 4.2 V. In the non-coated NMC, the SPE/NMC interface resistance exhibited a notable increase over time. In all the coated NMCs, the increase in the interface resistance was suppressed, indicating an improvement in the interface stability. In particular, the interface resistance of LiF and Al2O3 remained unchanged for 40 h at 4.2 V, thereby demonstrating the formation of a highly stable SPE/NMC interface. The charge/discharge measurements of the Li/SPE/coated NMC cell revealed that the capacity retention rate of NMC coated with LiF and Al2O3 was significantly enhanced in comparison to that of NMC without coating. |
| format | Article |
| id | doaj-art-4ffae0bbfd2a4f1f8cd49912175447b5 |
| institution | DOAJ |
| issn | 2186-2451 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | The Electrochemical Society of Japan |
| record_format | Article |
| series | Electrochemistry |
| spelling | doaj-art-4ffae0bbfd2a4f1f8cd49912175447b52025-08-20T03:22:37ZengThe Electrochemical Society of JapanElectrochemistry2186-24512025-06-0193606301406301410.5796/electrochemistry.25-71016electrochemistryInterfacial Stability of PEO Polymer Electrolyte with 4V-class LiNi0.6Mn0.2Co0.2O2 Cathode Coated with Various Inorganic MaterialsHiroya SAHASHI0Sou TAMINATO1https://orcid.org/0000-0002-9327-6422Daisuke MORI2Yasuo TAKEDA3Osamu YAMAMOTO4Nobuyuki IMANISHI5Kazuma HANAI6Keisuke NOMURA7Shinichi KUMAKURA8Department of Chemistry for Materials, Mie UniversityDepartment of Chemistry for Materials, Mie UniversityDepartment of Chemistry for Materials, Mie UniversityDepartment of Chemistry for Materials, Mie UniversityDepartment of Chemistry for Materials, Mie UniversityDepartment of Chemistry for Materials, Mie UniversityCorporate Research & Development, Umicore Japan KK.Corporate Research & Development, Umicore Japan KK.Corporate Research & Development, Umicore Japan KK.PEO-based solid polymer electrolytes (SPEs) exhibit a narrow potential window and undergo decomposition when in contact with 4V-class cathode active materials. The objective of this study was to investigate the stability of the contact interface between the PEO electrolyte and the positive electrode material, coated with various inorganic compounds on the surface. The time variation for the impedance of the interface between the PEO-based SPE and the LiNi0.6Mn0.2Co0.2O2 (NMC) coated with various inorganic compounds was measured. The following coated materials were tested: the ionic crystal LiF, the covalent oxide Al2O3, the ferroelectrics BaTiO3 and LiNbO3, the lithium ion conductor La0.45Li0.45TiO3 (LLTO), and the ferromagnetic and highly electron conductive La0.7Sr0.3MnO3 (LSMO). They were coated on the surface of NMC electrode using the sputtering method. The impedance of the Li/SPE/coated NMC cell was measured while maintaining a potential of 4.2 V. In the non-coated NMC, the SPE/NMC interface resistance exhibited a notable increase over time. In all the coated NMCs, the increase in the interface resistance was suppressed, indicating an improvement in the interface stability. In particular, the interface resistance of LiF and Al2O3 remained unchanged for 40 h at 4.2 V, thereby demonstrating the formation of a highly stable SPE/NMC interface. The charge/discharge measurements of the Li/SPE/coated NMC cell revealed that the capacity retention rate of NMC coated with LiF and Al2O3 was significantly enhanced in comparison to that of NMC without coating.https://www.jstage.jst.go.jp/article/electrochemistry/93/6/93_25-71016/_html/-char/enlithium solid polymer electrolyte4-volt class cathodesurface coatingsputtering method |
| spellingShingle | Hiroya SAHASHI Sou TAMINATO Daisuke MORI Yasuo TAKEDA Osamu YAMAMOTO Nobuyuki IMANISHI Kazuma HANAI Keisuke NOMURA Shinichi KUMAKURA Interfacial Stability of PEO Polymer Electrolyte with 4V-class LiNi0.6Mn0.2Co0.2O2 Cathode Coated with Various Inorganic Materials Electrochemistry lithium solid polymer electrolyte 4-volt class cathode surface coating sputtering method |
| title | Interfacial Stability of PEO Polymer Electrolyte with 4V-class LiNi0.6Mn0.2Co0.2O2 Cathode Coated with Various Inorganic Materials |
| title_full | Interfacial Stability of PEO Polymer Electrolyte with 4V-class LiNi0.6Mn0.2Co0.2O2 Cathode Coated with Various Inorganic Materials |
| title_fullStr | Interfacial Stability of PEO Polymer Electrolyte with 4V-class LiNi0.6Mn0.2Co0.2O2 Cathode Coated with Various Inorganic Materials |
| title_full_unstemmed | Interfacial Stability of PEO Polymer Electrolyte with 4V-class LiNi0.6Mn0.2Co0.2O2 Cathode Coated with Various Inorganic Materials |
| title_short | Interfacial Stability of PEO Polymer Electrolyte with 4V-class LiNi0.6Mn0.2Co0.2O2 Cathode Coated with Various Inorganic Materials |
| title_sort | interfacial stability of peo polymer electrolyte with 4v class lini0 6mn0 2co0 2o2 cathode coated with various inorganic materials |
| topic | lithium solid polymer electrolyte 4-volt class cathode surface coating sputtering method |
| url | https://www.jstage.jst.go.jp/article/electrochemistry/93/6/93_25-71016/_html/-char/en |
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