TFSI and TDI Anions: Probes for Solvate Ionic Liquid and Disproportionation-Based Lithium Battery Electrolytes
Journal article, 2017

Highly concentrated electrolytes based on Li-salts and chelating solvents, such as glymes, are promising as electrolytes for lithium batteries. This is due to their unique properties, such as higher electrochemical stabilities, compliance with high-voltage electrodes, low volatility and flammability, and inertness toward aluminum current collector corrosion. The nature of these properties originates from the molecular-level structure created in either solvate ionic liquids (Sits) or the less common ionic aggregates by disproportionation reactions. The nature of the anion plays a crucial role, and here, we present a computational study using TFSI and TDI anions as probes, revealing increasing differences upon increased salt concentration. TFSI-based electrolytes preferably form SILs, while TDI-based electrolytes form ionic aggregates. The latter lead to an unexpected creation of "free" cationic species even at (very) high salt concentrations and thus promise of ample lithium ion transport.

Salts

Li-S

Transport-Properties

Molecular-Dynamics Simulations

Organic Liquids

Raman-Spectroscopy

Mixtures

Phase-Behavior

Force-Fields

Author

Piotr Jankowski

Chalmers, Physics, Condensed Matter Physics

M. Dranka

Warsaw University of Technology

W. Wieczorek

Alistore - European Research Institute

Warsaw University of Technology

Patrik Johansson

Chalmers, Physics, Condensed Matter Physics

Journal of Physical Chemistry Letters

1948-7185 (eISSN)

Vol. 8 15 3678-3682

Subject Categories

Physical Chemistry

DOI

10.1021/acs.jpclett.7b01160

More information

Latest update

9/6/2018 2