12Ionic Liquid Electrolytes for Sodium‐Ion Batteries
12.1 Introduction
Ionic liquids (ILs) are liquids with only anions and cations at or near room temperature. As an ionic compound, the factor that causes the low melting point of ILs is the asymmetry of some substituents in their structure prevented ions from being regularly accumulated into crystals. ILs usually consist of organic cations and organic/inorganic anions. ILs are generally classified according to their cations or anions. The positive charge position of the cations is N, P‐based, and the main categories are imidazole, pyrrolidine, pyridine, morpholine, piperidine, quaternary ammonium, quaternary phosphonium, guanidine, etc. Among them, imidazole‐type ILs generally have a low ...
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