Imidazolium-based ionanofluid electrolytes with viscosity decoupled ion transport properties for lithium-ion batteries

Deb, D and Bhattacharya, S (2023) Imidazolium-based ionanofluid electrolytes with viscosity decoupled ion transport properties for lithium-ion batteries. In: Journal of Molecular Liquids, 379 .

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Abstract

A series of LiTFSI salt-doped ionanofluid electrolytes based on imidazolium ionic liquid that includes ionic liquid functionalized SnO2 nanoparticles were prepared through a simple solution-chemistry method. The obtained ionanofluid electrolytes exhibit high thermal stability, fragility, and substantially lower crystallinity than the original ionic liquid electrolytes. The temperature-dependent ion conductivity study indicates that in contrast to ionic liquid-based electrolytes, ionanofluid electrolytes are apparent to have viscosity-decoupled ion transport properties. The Li/LiFePO4 cell assembled with 15 wt% LiTFSI salt-doped ionanofluid electrolyte, having the highest Li+ ion transport ability with moderate ion conductivity, demonstrates appreciable cycling performance with excellent rate capability. The cell delivers a room temperature discharge capacity of about ∼ 141.2 mAhg−1 (∼88% of theoretical capacity (CTheo) of LiFePO4) at C/5 rate and is able to retain more than 96 % of the same with nearly 99 % coulombic efficiency after 50 charge–discharge cycles. The potentio-electrochemical impedance study reveal that the ionanofluid electrolyte able to form a stable passivation layer within the cell. The study establishes the enormous potential of ionanofluid electrolytes for practical applications in next-generation lithium-ion batteries. © 2023 Elsevier B.V.

Item Type:	Journal Article
Publication:	Journal of Molecular Liquids
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to Elsevier B.V.
Keywords:	Imidazolium ionic liquid; Ionanofluid electrolyte; Ionic conductivity; Lithium-ion battery
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	01 May 2023 06:16
Last Modified:	01 May 2023 06:16
URI:	https://eprints.iisc.ac.in/id/eprint/81239

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