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Imidazole-Based Lithium Salt LiHDI as a Solid Electrolyte Interphase-Stabilising Additive for Lithium-Conducting Electrolytes
Abstract
Lithium salt LiHDI (lithium 4,5-dicyano-2-(n-heptafluoropropyl)imidazolide) is proposed as a solid electrolyte interphase-stabilising additive for lithium-ion batteries, which can be added in a smaller amount than fluoroethylene carbonate (FEC) and vinylene carbonate (VC) additives. Electrolytes containing either lithium 4,5-dicyano-2-(trifluoromethyl)imidazolide (LiTDI) or battery-standard LiPF6 were tested with various amounts of LiHDI additive. Chemical stability in the presence of water and the thermal stability of LiHDI are on par with LiTDI. LiHDI additive does not negatively affect the properties of electrolytes. Conductivity measurements of solutions, galvanostatic cycling of graphite-LiFePO4 cells at room temperature, cells’ cycling at 60 °C, internal cell resistance monitoring during cycling, and XPS analysis of electrodes’ surfaces after cycling have been performed. LiHDI, unlike the FEC-VC mixture, does not negatively affect the properties of the electrolyte. Cycling showed improved capacity retention with LiHDI additive with both graphite and LiFePO4 as capacity-limiting electrodes over samples without additives. At elevated temperatures, samples with LiHDI exhibited better capacity retention during cycling than those with FEC-VC. Internal cell resistance can be correlated with capacity retention. XPS results show changes in the composition of SEI depending on the composition of the electrolyte and the duration of cycling.
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Authors (6)
-
Marek Broszkiewicz
- Politechnika Warszawska
-
Bartosz Brzozowski
- Politechnika Warszawska
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Tomasz Trzeciak
- Politechnika Warszawska
-
Aldona Zalewska
- Politechnika Warszawska
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Leszek Niedzicki
- Politechnika Warszawska
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Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.3390/molecules29040804
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Details
- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
-
MOLECULES
no. 29,
ISSN: 1420-3049 - Language:
- English
- Publication year:
- 2024
- Bibliographic description:
- Broszkiewicz M., Brzozowski B., Trzeciak T., Zalewska A., Ryl J., Niedzicki L.: Imidazole-Based Lithium Salt LiHDI as a Solid Electrolyte Interphase-Stabilising Additive for Lithium-Conducting Electrolytes// MOLECULES -,iss. 29 (2024), s.804-
- DOI:
- Digital Object Identifier (open in new tab) 10.3390/molecules29040804
- Sources of funding:
-
- Free publication
- Verified by:
- Gdańsk University of Technology
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