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Assessing the Ion Transport Properties of Highly Concentrated Non‐Flammable Electrolytes in a Commercial Li‐Ion Battery Cell
Author(s) -
Sälzer Fabian,
Pateras Pescara Lars,
Franke Felix,
Müller Clemens,
Winkler Jacqueline,
Schwalm Michael,
Roling Bernhard
Publication year - 2020
Publication title -
batteries and supercaps
Language(s) - English
Resource type - Journals
ISSN - 2566-6223
DOI - 10.1002/batt.201900111
Subject(s) - electrolyte , ionic liquid , ion , imide , lithium (medication) , ionic bonding , ionic conductivity , battery (electricity) , materials science , flammable liquid , inorganic chemistry , chemistry , organic chemistry , thermodynamics , electrode , catalysis , medicine , power (physics) , physics , endocrinology
In order to assess the ion transport properties of alternative non‐flammable electrolytes in a typical commercial Li‐ion battery cell, we have measured the ionic conductivity σ i o nand the lithium‐ion transference number under anion‐blocking conditions, tL i +A B C , for two classes of highly concentrated battery electrolytes: (i) Mixtures of the ionic liquid N ‐methyl‐ N ‐propyl‐pyrrolidinium bis(fluorosulfonyl)imide (Pyr 13 FSI) with different amounts of the lithium bis(fluorosulfonyl)imide (LiFSI), and (ii) a solvate ionic liquid consisting of an equimolar mixture of tetraglyme (G4) and LiFSI. Together with previously published data on the solvate ionic liquid G4/LiTFSI (1 : 1), the obtained Li + ion transport data was used to estimate the overall resistance and the resulting maximum cycling rate of a commercial 10 Ah Li‐ion pouch cell containing these alternative electrolytes. Our results suggest that Pyr 13 FSI/LiFSI mixtures would allow for maximum charging/discharging rates close to 1 C, while the solvate ionic liquids would only support maximum rates of about 0.3 C.