Stabilising lithium metal using ionic liquids for long lived batteries

Basile, Andrew, Bhatt, Anand I., & O'Mullane, Anthony P. (2016) Stabilising lithium metal using ionic liquids for long lived batteries. Nature Communications, 7, Article Number-11794.

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Suppressing dendrite formation at lithium metal anodes during cycling is critical for the implementation of future lithium metal-based battery technology. Here we report that it can be achieved via the facile process of immersing the electrodes in ionic liquid electrolytes for a period of time before battery assembly. This creates a durable and lithium ion-permeable solid–electrolyte interphase that allows safe charge–discharge cycling of commercially applicable Li|electrolyte|LiFePO4 batteries for 1,000 cycles with Coulombic efficiencies 499.5%. The tailored solid–electrolyte interphase is prepared using a variety of electrolytes based on the N-propyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide room temperature ionic liquid containing lithium salts. The formation is both time- and lithium salt-dependant, showing dynamic morphology changes, which when optimized prevent dendrite formation and consumption of electrolyte during cycling. This work illustrates that a simple, effective and industrially applicable lithium metal pretreatment process results in a commercially viable cycle life for a lithium metal battery.

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4 citations in Web of Science®

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ID Code: 96322
Item Type: Journal Article
Refereed: Yes
Keywords: Li metal batteries, Solid electrolyte interphase, Ionic liquids, Batteries
DOI: 10.1038/ncomms11794
ISSN: 2041-1723
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Facilities: Central Analytical Research Facility
Copyright Owner: 2016 Basile, A. et al.
Copyright Statement: This work is licensed under a Creative Commons Attribution 4.0
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Deposited On: 23 Jun 2016 23:04
Last Modified: 12 Jul 2016 06:17

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