4.8 Review

Recent development of ionic liquid-based electrolytes in lithium-ion batteries

Journal

JOURNAL OF POWER SOURCES
Volume 542, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.jpowsour.2022.231792

Keywords

Lithium-ion batteries; Ionic liquids; Ionic liquid-based electrolytes; Ionic liquid-hybrid electrolytes

Funding

  1. National Natural Science Foundation of China [22178187]
  2. Natural Science Foundation of Shandong Province [ZR202102180830]
  3. Taishan Scholars Program of Shandong Province [tsqn201909091]
  4. High-Grade Talents Plan of Qingdao University

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Ionic liquid-based electrolytes have been developed in lithium-ion batteries to enhance safety and performance. This review summarizes the recent progress in the physiochemical properties, interphase formation ability, and electrochemical performance of ionic liquids and ionic liquid-based electrolytes. The applications of different types of ionic liquid-based electrolytes are discussed in detail. The challenges and perspectives for further development of ionic liquid-based electrolytes in lithium-ion batteries are also presented.
Lithium-ion batteries are promising technologies for large-scale energy storage due to their high energy densities. However, the safety concerns of traditional lithium-ion batteries caused by usage of flammable organic-based electrolytes have severely hindered their practical applications. Ionic liquids (ILs) are molten salts with melting points lower than 100 degrees C. The unique physiochemical properties of ionic liquids include wide electrochemical stability window, high ionic conductivity, superior thermal stability, and non-flammability. When employing as electrolyte components, ionic liquids have demonstrated improved safety and electrochemical performances in lithium-ion batteries. This review summarizes the recent development of ionic liquids and ionic liquid-based electrolytes in terms of physiochemical properties, interphase formation ability, and electrochemical performance in lithium-ion batteries. The applications of pure ionic liquid-based electrolytes, ionic liquid-hybrid electrolytes, and (quasi) solid-state ionic liquid electrolytes are discussed in detail. Finally, the challenges and perspectives for the application of ionic liquid-based electrolytes in lithium-ion batteries are also presented for further development.

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