Hybrid Ionogel Electrolytes for Advanced Lithium Secondary Batteries: Developments and Challenges

Abstract

Incidents in the use of lithium-ion batteries are usually caused by the malfunction of flammable organic liquid electrolytes with poor thermal stability. Therefore, the development of noncombustible electrolytes is regarded as one of the most effective means to prevent the safety hazards of lithium-ion batteries. Ionic liquids have attracted much interest recently, mainly due to their high ionic conductivity, low volatility, and incombustibility. The application of ionic liquids to the preparation of quasi-solid-state gel electrolytes combines the advantages of ionic liquids and avoids the risks of organic liquid electrolytes. Therefore, the solid-state ionogels have been considered as a promising alternative electrolyte system, especially for the much-desired energy storage devices with higher energy density and flexibility. This review focuses on the recent progress of ionogel electrolytes for lithium-ion batteries. The preparation strategies for ionogel electrolytes based on different frameworks, namely inorganic matrix, organic matrix, and organicinorganic hybrid matrix, are discussed. Subsequently, efforts to improve the properties of the ionogel electrolytes, including the ionic conductivity, mechanical properties, and lithium-ion transfer number, are summarized. Besides, the applications of ionogel electrolytes in high-voltage lithiumion batteries and lithium metal batteries as well as the batteries under extreme environments are outlined. Finally, the perspectives on studying and improving the performances of ionogel electrolytes for advanced lithium-ion batteries are provided.

Computational approach inspired advancements of solid-state electrolytes for lithium secondary batteries: from first-principles to machine learning

“…Ionogel-based CEs have emerged as advanced options for lithium batteries due to their unique combination of ionic conductivity and mechanical stability. 197,198 These electrolytes consist of a polymer gel matrix infused with ionic liquids (ILs), creating a highly conductive pathway for Li + . The ILs are salts composed of organic cations and inorganic (e.g., Cl À , Br À , and PF 6 À ) or organic anions (TFSI À ) with a melting point lower than 100 1C.…”

Cell Design for Improving Low-Temperature Performance of Lithium-Ion Batteries for Electric Vehicles

“…Conductivity is Cryogenic ionic liquid electrolytes. Ionic liquids have a wide working temperature range and can enhance the low-temperature characteristic of LIBs [20,[96][97][98]. bis(trifluoromethanesulfonyl)imide (TFSI)-based ionic liquids exhibit good, stable electrochemical performance [20].…”

Gel Polymer Electrolytes: Advancing Solid-State Batteries for High-Performance Applications

“…The practical applications of electrolytes in batteries depend on important properties including electrochemical stability, ionic conductivity, and thermal stability [4,5]. Traditionally, organic liquid electrolytes have been widely used in lithium-ion batteries (LIBs) [6]. However, the use of organic liquid electrolytes presents significant operational safety concerns, including leakage, flammability, combustion, and electrochemical instability [7,8].…”