Pyrrolidium- and Imidazolium-Based Ionic Liquids and Electrolytes with Flexible Oligoether Anions
Journal article, 2024

A new class of fluorine-free ionic liquids (ILs) and electrolytes based on aliphatic flexible oligoether anions, 2-(2-methoxyethoxy)acetate (MEA) and 2-[2-(2-methoxyethoxy)ethoxy]acetate (MEEA), coupled with pyrrolidinium and imidazolium cations is introduced. For the ILs with MEEA anions, Li+ conducting electrolytes are created by doping the ILs with 30 mol % of LiMEEA. The structural flexibility of the oligoether functionality in the anion results in glass transition temperatures (Tg) as low as −60 °C for the neat ILs and the electrolytes. The imidazolium-based ILs and electrolytes reveal better thermal stabilities but higher Tg and lower electrochemical stabilities than the corresponding pyrrolidinium-based analogues. All neat ILs show comparable transport properties for the cations and these decrease by the addition of lithium salt – the pyrrolidinium-based electrolyte being affected the most.

lithium-ion batteries

NMR diffusometry

Fluorine-free ionic liquids

electrochemistry

electrolytes

Author

Mukhtiar Ahmed

Luleå University of Technology

Andrei Filippov

Luleå University of Technology

Patrik Johansson

Chalmers, Physics, Materials Physics

Faiz Ullah Shah

Luleå University of Technology

ChemPhysChem

1439-4235 (ISSN) 1439-7641 (eISSN)

Vol. 25 9 e202300810

Enabling Safer Batteries via Click-Chemistry Created Fluorine-Free Electrolytes

Swedish Energy Agency (48194-1), 2020-01-01 -- 2023-12-31.

Driving Forces

Sustainable development

Subject Categories

Energy Engineering

Condensed Matter Physics

Areas of Advance

Energy

Materials Science

DOI

10.1002/cphc.202300810

PubMed

38349198

More information

Latest update

5/18/2024