Investigating the structural change and degradation mechanism of MnO2 for lithium-ion batteries.
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| Title: | Investigating the structural change and degradation mechanism of MnO2 for lithium-ion batteries. |
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| Authors: | Lin, Chia-Ching1 (AUTHOR), Kubota, Kei2 (AUTHOR), Zhao, Yu3 (AUTHOR), Yu, Denis Y.W.1,2 (AUTHOR) yu.denis@nims.go.jp |
| Source: | Journal of Power Sources. Aug2025, Vol. 648, pN.PAG-N.PAG. 1p. |
| Subjects: | Manganese dioxide, Ethylene carbonates, Surface coatings, Lithium-ion batteries, High voltages |
| Abstract: | Tunnel-type manganese dioxide (MnO 2) is widely used as a cathode material for commercial lithium-metal primary batteries due to its low cost, non-toxicity, and high capacity of 308 mAh g−1. However, it has not been used in rechargeable batteries because it showed poor cycle stability in the past. In this study, we systematically investigate the electrochemical behavior of β-MnO 2 as a cathode for lithium-ion batteries, identifying key degradation mechanisms and proposing a surface modification strategy to enhance its performance. Specifically, β-MnO 2 delivers a reversible capacity of approximately 220 mAh g−1 at 30 mA g−1. During first cycle, β-MnO 2 transforms irreversibly to Li x MnO 2 with an orthorhombic phase as shown by in-situ X-ray diffraction, which causes some Li to be trapped in the structure. The emergence of a spinel-like LiMn 2 O 4 phase upon further cycling contributes to capacity fading. The cycle stability of MnO 2 is significantly influenced by the electrolyte composition, with higher capacity fading observed in electrolytes containing larger amount of ethylene carbonate which correlates with increased manganese dissolution. To mitigate these issues, a 2 wt% Li 3 PO 4 surface coating was applied to the β-MnO 2 particles, which improves its capacity retention and Coulombic efficiency, particularly at higher cut-off voltages, by reducing electrolyte decomposition. • A capacity of 230 mAh g−1 is obtained from β-MnO 2. • β-MnO 2 undergoes structural change to spinel-like phase during cycling. • Mn dissolution facilitated by ethylene carbonate in the electrolyte. • Higher Mn loss observed at higher voltage, with larger capacity drop. • Li 3 PO 4 coating improves capacity retention by reducing Mn dissolution. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Power Sources is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 185600774 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Investigating the structural change and degradation mechanism of MnO2 for lithium-ion batteries. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Lin%2C+Chia-Ching%22">Lin, Chia-Ching</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kubota%2C+Kei%22">Kubota, Kei</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhao%2C+Yu%22">Zhao, Yu</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yu%2C+Denis+Y%2EW%2E%22">Yu, Denis Y.W.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> yu.denis@nims.go.jp</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Power+Sources%22">Journal of Power Sources</searchLink>. Aug2025, Vol. 648, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Manganese+dioxide%22">Manganese dioxide</searchLink><br /><searchLink fieldCode="DE" term="%22Ethylene+carbonates%22">Ethylene carbonates</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+coatings%22">Surface coatings</searchLink><br /><searchLink fieldCode="DE" term="%22Lithium-ion+batteries%22">Lithium-ion batteries</searchLink><br /><searchLink fieldCode="DE" term="%22High+voltages%22">High voltages</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Tunnel-type manganese dioxide (MnO 2) is widely used as a cathode material for commercial lithium-metal primary batteries due to its low cost, non-toxicity, and high capacity of 308 mAh g−1. However, it has not been used in rechargeable batteries because it showed poor cycle stability in the past. In this study, we systematically investigate the electrochemical behavior of β-MnO 2 as a cathode for lithium-ion batteries, identifying key degradation mechanisms and proposing a surface modification strategy to enhance its performance. Specifically, β-MnO 2 delivers a reversible capacity of approximately 220 mAh g−1 at 30 mA g−1. During first cycle, β-MnO 2 transforms irreversibly to Li x MnO 2 with an orthorhombic phase as shown by in-situ X-ray diffraction, which causes some Li to be trapped in the structure. The emergence of a spinel-like LiMn 2 O 4 phase upon further cycling contributes to capacity fading. The cycle stability of MnO 2 is significantly influenced by the electrolyte composition, with higher capacity fading observed in electrolytes containing larger amount of ethylene carbonate which correlates with increased manganese dissolution. To mitigate these issues, a 2 wt% Li 3 PO 4 surface coating was applied to the β-MnO 2 particles, which improves its capacity retention and Coulombic efficiency, particularly at higher cut-off voltages, by reducing electrolyte decomposition. • A capacity of 230 mAh g−1 is obtained from β-MnO 2. • β-MnO 2 undergoes structural change to spinel-like phase during cycling. • Mn dissolution facilitated by ethylene carbonate in the electrolyte. • Higher Mn loss observed at higher voltage, with larger capacity drop. • Li 3 PO 4 coating improves capacity retention by reducing Mn dissolution. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Power Sources is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.jpowsour.2025.237417 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Manganese dioxide Type: general – SubjectFull: Ethylene carbonates Type: general – SubjectFull: Surface coatings Type: general – SubjectFull: Lithium-ion batteries Type: general – SubjectFull: High voltages Type: general Titles: – TitleFull: Investigating the structural change and degradation mechanism of MnO2 for lithium-ion batteries. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Lin, Chia-Ching – PersonEntity: Name: NameFull: Kubota, Kei – PersonEntity: Name: NameFull: Zhao, Yu – PersonEntity: Name: NameFull: Yu, Denis Y.W. IsPartOfRelationships: – BibEntity: Dates: – D: 30 M: 08 Text: Aug2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 03787753 Numbering: – Type: volume Value: 648 Titles: – TitleFull: Journal of Power Sources Type: main |
| ResultId | 1 |
