Rational Lithium Salt Molecule Tuning for Fast Charging/Discharging Lithium Metal Battery
© 2024 Wiley‐VCH GmbH..
The electrolytes for lithium metal batteries (LMBs) are plagued by a low Li+ transference number (T+) of conventional lithium salts and inability to form a stable solid electrolyte interphase (SEI). Here, we synthesized a self-folded lithium salt, lithium 2-[2-(2-methoxy ethoxy)ethoxy]ethanesulfonyl(trifluoromethanesulfonyl) imide (LiETFSI), and comparatively studied with its structure analogue, lithium 1,1,1-trifluoro-N-[2-[2-(2-methoxyethoxy)ethoxy)]ethyl]methanesulfonamide (LiFEA). The special anion chemistry imparts the following new characteristics: i) In both LiFEA and LiETFSI, the ethylene oxide moiety efficiently captures Li+, resulting in a self-folded structure and high T+ around 0.8. ii) For LiFEA, a Li-N bond (2.069 Å) is revealed by single crystal X-ray diffraction, indicating that the FEA anion possesses a high donor number (DN) and thus an intensive interphase "self-cleaning" function for an ultra-thin and compact SEI. iii) Starting from LiFEA, an electron-withdrawing sulfone group is introduced near the N atom. The distance of Li-N is tuned from 2.069 Å in LiFEA to 4.367 Å in LiETFSI. This alteration enhances ionic separation, achieves a more balanced DN, and tunes the self-cleaning intensity for a reinforced SEI. Consequently, the fast charging/discharging capability of LMBs is progressively improved. This rationally tuned anion chemistry reshapes the interactions among Li+, anions, and solvents, presenting new prospects for advanced LMBs.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2024 |
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| Erschienen: |
2024 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:63 |
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| Enthalten in: |
Angewandte Chemie (International ed. in English) - 63(2024), 19 vom: 06. Apr., Seite e202316717 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Zhou, Pan [VerfasserIn] |
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Donor number |
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| Anmerkungen: |
Date Revised 25.04.2024 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1002/anie.202316717 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| 520 | |a The electrolytes for lithium metal batteries (LMBs) are plagued by a low Li+ transference number (T+) of conventional lithium salts and inability to form a stable solid electrolyte interphase (SEI). Here, we synthesized a self-folded lithium salt, lithium 2-[2-(2-methoxy ethoxy)ethoxy]ethanesulfonyl(trifluoromethanesulfonyl) imide (LiETFSI), and comparatively studied with its structure analogue, lithium 1,1,1-trifluoro-N-[2-[2-(2-methoxyethoxy)ethoxy)]ethyl]methanesulfonamide (LiFEA). The special anion chemistry imparts the following new characteristics: i) In both LiFEA and LiETFSI, the ethylene oxide moiety efficiently captures Li+, resulting in a self-folded structure and high T+ around 0.8. ii) For LiFEA, a Li-N bond (2.069 Å) is revealed by single crystal X-ray diffraction, indicating that the FEA anion possesses a high donor number (DN) and thus an intensive interphase "self-cleaning" function for an ultra-thin and compact SEI. iii) Starting from LiFEA, an electron-withdrawing sulfone group is introduced near the N atom. The distance of Li-N is tuned from 2.069 Å in LiFEA to 4.367 Å in LiETFSI. This alteration enhances ionic separation, achieves a more balanced DN, and tunes the self-cleaning intensity for a reinforced SEI. Consequently, the fast charging/discharging capability of LMBs is progressively improved. This rationally tuned anion chemistry reshapes the interactions among Li+, anions, and solvents, presenting new prospects for advanced LMBs | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Donor number | |
| 650 | 4 | |a Lithium metal batteries | |
| 650 | 4 | |a Self-folded salts | |
| 650 | 4 | |a Solid electrolyte interphase | |
| 650 | 4 | |a fast charging/discharging | |
| 700 | 1 | |a Zhou, Haiyu |e verfasserin |4 aut | |
| 700 | 1 | |a Xia, Yingchun |e verfasserin |4 aut | |
| 700 | 1 | |a Feng, Qingqing |e verfasserin |4 aut | |
| 700 | 1 | |a Kong, Xian |e verfasserin |4 aut | |
| 700 | 1 | |a Hou, Wen-Hui |e verfasserin |4 aut | |
| 700 | 1 | |a Ou, Yu |e verfasserin |4 aut | |
| 700 | 1 | |a Song, Xuan |e verfasserin |4 aut | |
| 700 | 1 | |a Zhou, Hang-Yu |e verfasserin |4 aut | |
| 700 | 1 | |a Zhang, Weili |e verfasserin |4 aut | |
| 700 | 1 | |a Lu, Yang |e verfasserin |4 aut | |
| 700 | 1 | |a Liu, Fengxiang |e verfasserin |4 aut | |
| 700 | 1 | |a Cao, Qingbin |e verfasserin |4 aut | |
| 700 | 1 | |a Liu, Hao |e verfasserin |4 aut | |
| 700 | 1 | |a Yan, Shuaishuai |e verfasserin |4 aut | |
| 700 | 1 | |a Liu, Kai |e verfasserin |4 aut | |
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