[EMIM]Cl (1-Ethyl-3-methylimidazolium chloride, >99.0%) Ionic Liquid as Electrolyte Solvent and Additive, 25 or 100 g/bottle, CESAILEMIMCl

EMIMCl (1-Ethyl-3-methylimidazolium chloride) is a popular and widely studied example of an ionic liquid (IL) used as an electrolyte component in various electrochemical devices, particularly batteries and supercapacitors. It serves as the high-stability, non-flammable solvent into which a mobile metal salt is dissolved (e.g., LiPF6, LiTFSI, NaTFSI, or KTFSI) to create the working electrolyte. EMImCl is primarily used as a component in the electrolyte systems for Aluminum-Ion Batteries (AIBs) and related technologies, rather than as a neat solvent for conventional lithium or sodium salts.

Aluminum Electroplating and Batteries: This is the most famous application for [EMIM]Cl. When mixed with Aluminum Chloride (AlCl3), it forms a room-temperature liquid known as a Chloroaluminate melt. As for electroplating, it allows for the high-quality plating of aluminum onto other metals at room temperature, which is impossible in aqueous solutions because aluminum reacts violently with water. For aluminum-ion batteries, [EMIM]Cl+ AlCl3 serves as the electrolyte for rechargeable aluminum batteries. The [AlCl4]- and [Al2Cl7]- ions facilitate the reversible intercalation of aluminum into graphite cathodes.

CO2 Electroreduction (CO2RR): [EMIM]Cl is used as a functional additive in aqueous CO2 reduction. The [EMIM]+ cation adsorbs onto the catalyst surface and stabilizes the CO2'- radical intermediate. The presence of the chloride (Cl-) anion can specifically modify the surface of Copper or Silver catalysts, often promoting the formation of Carbon Monoxide (CO) or Formate by suppressing the Hydrogen Evolution Reaction (HER).

As for supercapacitors, [EMIM]Cl is rarely used as a pure liquid due to its melting point. Instead, it is typically used in ionogels or as a redox-active additive. [EMIM]Cl is often immobilized within a polymer matrix (like PVA or PVDF) to create a solid-state electrolyte. These "ionogels" offer high thermal stability and eliminate the risk of leakage found in liquid-cell supercapacitors. Compared to protons (H+), the bulky [EMIM]+ cation has lower mobility, which can lead to higher Equivalent Series Resistance (ESR) and lower power density. However, it allows for a wider Electrochemical Stability Window (ESW) of ~2.8 V, significantly higher than the 1.2 V limit of aqueous systems.The chloride anion can sometimes participate in surface redox reactions with specific electrode materials (like RuO2 or certain conductive polymers), providing additional "pseudocapacitive" energy storage.

Part Number	CESAILEMIMCl (C-ESA-ILEMIMCl)
CAS	65039-09-0
Chemical Formula	C6H11ClN2
Appearance	Off-white to pale yellow powder
Purity	>99.0%
Molecular Weight	146.62 g/mol
Melting Point	77-79 °C
Package Size	25 or 100 g/bottle

Notes: Please try to store the EMIMCl powder is in the dry place. 

References: 

1. J. Li, et al. Ternary AlCl3-Urea-[EMIm]Cl Ionic Liquid Electrolyte for Rechargeable Aluminum-Ion Batteries, J. Electrochem. Soc., 2017, 164, A3093.
2. T. Schoetzi, et al. Aluminium Deposition in EMImCl-AlCl3 Ionic Liquid and Ionogel for Improved Aluminium Batteries, J. Electrochem. Soc., 2022, 167, 040516. 
3. S. S. Golru, et al., Modifying Copper Local Environment with Electrolyte Additives to Alter CO2 Electroreduction vs Hydrogen Evolution, ACS Catal. 2023, 13, 12, 7831–7843. 
4. A. Tatlisu, et al., High-Voltage and Low-Temperature Aqueous Supercapacitor Enabled by “Water-in-Imidazolium Chloride” Electrolytes, ChemSusChem, 2018, 11, 3899-3904.