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Pyrrolidinium Containing Ionic Liquid Electrolytes for Li-Based Batteries.

Louise M McGrath¹, James F Rohan¹

¹Electrochemical Materials and Energy Group, Tyndall National Institute, University College Cork, Lee Maltings, T12 R5CP Cork, Ireland.

Molecules (Basel, Switzerland)

|December 23, 2020

Summary

Pyrrolidinium-based ionic liquids (ILs) show promise as electrolytes for energy storage devices, offering high conductivity and stability. This review explores their properties and compatibility with various electrode materials for advanced applications.

Keywords:

anode cathode electrolyte energy storage ionic liquids lithium ion batteries lithium metal batteries polymer gel electrolyte pyrrolidinium

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Area of Science:

Electrochemistry
Materials Science
Energy Storage

Background:

Conventional solid-state electrolytes face limitations in energy storage applications.
Ionic liquids (ILs) are emerging as promising alternatives due to their unique properties.
Pyrrolidinium-based ILs are particularly investigated for their high ionic conductivity, low volatility, and wide electrochemical stability windows (ESW).

Purpose of the Study:

To review the utilization of pyrrolidinium-based ionic liquid electrolytes in energy storage devices.
To discuss the influence of cation/anion combinations on IL properties.
To assess the compatibility of these ILs with various electrode materials for micro energy applications.

Main Methods:

Literature review focusing on pyrrolidinium-based ionic liquids.
Analysis of physical and electrochemical properties based on cation/anion combinations.
Evaluation of compatibility with electrode materials like LFP, V2O5, Ge, and Sn.
Investigation of polymer gel electrolytes and modified pyrrolidinium cations.

Main Results:

Pyrrolidinium-based ILs exhibit favorable properties for energy storage, including high ionic conductivity and wide ESW.
The choice of cation and anion significantly impacts the IL's performance.
Compatibility with diverse electrode materials (LFP, V2O5, Ge, Sn) is demonstrated, especially for thin-film and nanostructured electrodes.
Polymer gel electrolytes and modified cations show potential for advanced fabrication.

Conclusions:

Pyrrolidinium-based ionic liquids are viable electrolytes for next-generation energy storage.
Tailoring cation/anion combinations is crucial for optimizing performance.
These ILs are suitable for micro energy storage applications using various electrode materials and fabrication techniques.