Binary Solvent Induced Stable Interphase Layer for Ultra-Long Life Sodium Metal Batteries
© 2024 Wiley‐VCH GmbH..
Sodium foil, promising for high-energy-density batteries, faces reversibility challenges due to its inherent reactivity and unstable solid electrolyte interphase (SEI) layer. In this study, a stable sodium metal battery (SMB) is achieved by tuning the electrolyte solvation structure through the addition of co-solvent 2-methyl tetrahydrofuran (MTHF) to diglyme (Dig). The introduction of cyclic ether-based MTHF results in increased anion incorporation in the solvation structure, even at lower salt concentrations. Specifically, the anion stabilization capabilities of the environmentally sustainable MTHF co-solvent lead to a contact-ion pair-based solvation structure. Time-of-flight mass spectroscopy analysis reveals that a shift toward an anion-dominated solvation structure promotes the formation of a thin and uniform SEI layer. Consequently, employing a NaPF6-based electrolyte with a Dig:MTHF ratio of 50% (v/v) binary solvent yields an average Coulombic efficiency of 99.72% for 300 cycles in Cu||Na cell cycling. Remarkably, at a C/2 cycling rate, Na||Na symmetric cell cycling demonstrates ultra-long-term stability exceeding 7000 h, and full cells with Na0.44MnO2 as a cathode retain 80% of their capacity after 500 cycles. This study systematically examines solvation structure, SEI layer composition, and electrochemical cycling, emphasizing the significance of MTHF-based binary solvent mixtures for high-performance SMBs.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2024 |
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| Erschienen: |
2024 |
| Enthalten in: |
Zur Gesamtaufnahme - year:2024 |
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| Enthalten in: |
Advanced materials (Deerfield Beach, Fla.) - (2024) vom: 11. März, Seite e2312508 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Vaidyula, Rinish Reddy [VerfasserIn] |
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| Links: |
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| Themen: |
Electrolyte |
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| Anmerkungen: |
Date Revised 21.03.2024 published: Print-Electronic Citation Status Publisher |
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| doi: |
10.1002/adma.202312508 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM369555619 |
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| 520 | |a © 2024 Wiley‐VCH GmbH. | ||
| 520 | |a Sodium foil, promising for high-energy-density batteries, faces reversibility challenges due to its inherent reactivity and unstable solid electrolyte interphase (SEI) layer. In this study, a stable sodium metal battery (SMB) is achieved by tuning the electrolyte solvation structure through the addition of co-solvent 2-methyl tetrahydrofuran (MTHF) to diglyme (Dig). The introduction of cyclic ether-based MTHF results in increased anion incorporation in the solvation structure, even at lower salt concentrations. Specifically, the anion stabilization capabilities of the environmentally sustainable MTHF co-solvent lead to a contact-ion pair-based solvation structure. Time-of-flight mass spectroscopy analysis reveals that a shift toward an anion-dominated solvation structure promotes the formation of a thin and uniform SEI layer. Consequently, employing a NaPF6-based electrolyte with a Dig:MTHF ratio of 50% (v/v) binary solvent yields an average Coulombic efficiency of 99.72% for 300 cycles in Cu||Na cell cycling. Remarkably, at a C/2 cycling rate, Na||Na symmetric cell cycling demonstrates ultra-long-term stability exceeding 7000 h, and full cells with Na0.44MnO2 as a cathode retain 80% of their capacity after 500 cycles. This study systematically examines solvation structure, SEI layer composition, and electrochemical cycling, emphasizing the significance of MTHF-based binary solvent mixtures for high-performance SMBs | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a electrolyte | |
| 650 | 4 | |a long‐term stability | |
| 650 | 4 | |a sodium metal batteries | |
| 650 | 4 | |a solvation structure | |
| 650 | 4 | |a solvent mixtures | |
| 700 | 1 | |a Nguyen, Mai H |e verfasserin |4 aut | |
| 700 | 1 | |a Weeks, Jason A |e verfasserin |4 aut | |
| 700 | 1 | |a Wang, Yixian |e verfasserin |4 aut | |
| 700 | 1 | |a Wang, Ziqing |e verfasserin |4 aut | |
| 700 | 1 | |a Kawashima, Kenta |e verfasserin |4 aut | |
| 700 | 1 | |a Paul-Orecchio, Austin G |e verfasserin |4 aut | |
| 700 | 1 | |a Celio, Hugo |e verfasserin |4 aut | |
| 700 | 1 | |a Dolocan, Andrei |e verfasserin |4 aut | |
| 700 | 1 | |a Henkelman, Graeme |e verfasserin |4 aut | |
| 700 | 1 | |a Mullins, C Buddie |e verfasserin |4 aut | |
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