Functional ionic liquids: Cationic SEI-formers for lithium batteries
Journal article, 2019

More stable electrolytes for lithium-ion batteries are urgently needed, and apart from general improvements in thermal and electrochemical stabilities, both stability, safety and performance are connected with the formation of the solid electrolyte interphase (SEI) layer at the negative electrode. A high performant SEI-layer; thin, uniform, highly ion conducting, etc., is difficult to achieve and proper control of its formation process is therefore highly desirable. The idea presented here is based on computational screening of a wide range of modifications of wellknown ionic liquid (IL) cations towards better ability to form SEI-layers - i.e. acting as SEI-formers. Different cation chemistries and kinds of structural modifications were tested, with introduction of nitrile groups and/or double bonds resulting to be the most promising. The latter is outlined as especially beneficial, as apart from enabling an easier initiation reaction it provides a site for polymerization, resulting in polymeric SEI-products poly (IL) s (PILs), which can be expected to provide both protection of the electrode surface and fast Li thorn transport.

Battery electrolyte

Lithium battery

Solid electrolyte interphase

Ionic liquids


Piotr Jankowski

Warsaw University of Technology

Centre national de la recherche scientifique (CNRS)

Chalmers, Physics, Materials Physics

Wladyslaw Wieczorek

Centre national de la recherche scientifique (CNRS)

Warsaw University of Technology

Patrik Johansson

Centre national de la recherche scientifique (CNRS)

Chalmers, Physics, Materials Physics

Energy Storage Materials

2405-8297 (eISSN)

Vol. 20 108-117

Next generation batteries for hybrid and electric vehicles

Swedish Energy Agency, 2013-12-01 -- 2017-12-31.

Subject Categories

Inorganic Chemistry

Materials Chemistry

Other Chemistry Topics

Areas of Advance



Materials Science



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