[BMIM][PF6] (1-Butyl-3-methylimidazolium hexafluorophosphate, >99.0%) Ionic Liquid as Electrolyte Solvent and Additive, 25 or 100 g/bottle, CESAILBMIMPF6

BMIMPF6 (1-Butyl-3-methylimidazolium hexafluorophosphate) 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.

Lithium-Ion Batteries (LIB) Additive: Used in small concentrations (1–5 wt%) as a functional additive. It can also significantly reduces the flammability of standard carbonate electrolytes, acting as a safety "buffer". Some studies show that 5% [BMIM][PF6] in a binary electrolyte improves capacity retention in LiFePO4 batteries by stabilizing the electrode-electrolyte interface.

CO2 Electroreduction (CO2RR): Like other imidazolium ionic liquids, [BMIM][PF6] acts as a co-catalyst for CO2 reduction. (1) Intermediate Stabilization: The [BMIM]+ cation adsorbs onto catalysts (like Silver or Gold) and stabilizes the energy-intensive CO2'- radical intermediate. It is highly effective at steering the reaction toward Carbon Monoxide (CO) while suppressing the competing Hydrogen Evolution Reaction (HER). Its hydrophobic nature helps repel water from the electrode, further starving the HER.

Supercapacitors: [BMIM][PF6] is a popular electrolyte for high-energy density supercapacitors. While aqueous capacitors are limited to 1.2 V, [BMIM][PF6] can operate up to 3.0 V. The bulky [BMIM]+ and [PF6]- ions form a thick electric double layer (EDL). Research shows that the larger anion size compared to BF4- can actually enhance capacitance at high voltages.

Part Number	CESAILBMIMPF6 (C-ESA-ILBMIMPF6)
CAS	174501-64-5
Chemical Formula	C8H15F6N2P
Appearance	Colorless liquid
Purity	>99.0% (Battery Grade)
Molecular Weight	284.18 g/mol
Density	1.38 g/cm3
Package Size	25 or 100 g/bottle

Notes: Please try to store the BMIMPF6 ionic liquid in the dry place. 

References: 

1. Z. Hu, et al. A molecular dynamics simulation study of the electric double layer and capacitance of [BMIM][PF6] and [BMIM][BF4] room temperature ionic liquids near charged surfaces, Phys. Chem. Chem. Phys., 2013,15, 14234-14247.
2. M. Gorle, et al. Tuning MgCl2 content in BMIMPF6 to optimize mg-ion battery performance, J. Energy Storage, 2024, 94, 112543. 
3. A. Atifi, et al., Directing the Outcome of CO2 Reduction at Bismuth Cathodes Using Varied Ionic Liquid Promoters, ACS Catal. 2018, 8, 4, 2857–2863. 
4. H. A. Chagas, et al., Comparing supercapacitors with graphene/graphyne electrodes and [Bmim][PF6], [Emim][BF4], [Ch][Gly] and [Pyr][Tfsi] ionic liquids using molecular dynamics, J. Molecule Liquids, 2023, 379, 121703.