Py12TFSI {1-Ethyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, >99.9%} Ionic Liquid as Battery Electrolyte Solvent, 25-100 g/bottle, CBESPy12TFSI

Py12TFSI (1-Ethyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide) is a prominent room-temperature ionic liquid (RTIL) engineered for advanced electrochemical devices, including lithium-metal batteries, high-voltage sodium-ion systems, and supercapacitors. Composed of an aliphatic quaternary ammonium pyrrolidinium cation and a heavily fluorinated imide anion, it offers a distinct profile of stability compared to conventional organic carbonate solvents.

The key physicochemical & electrochemical characteristics are: (1) Wide Electrochemical Window: Py12TFSI features a broad stability window (typically exceeding 5.0-6.0 V vs. Li/Li+), making it structurally resilient against high-potential cathode surfaces—such as high-voltage olivines (like LMFP) or high-nickel layered oxides. (2) Thermal Safety & Non-Volatility: Like other members of the pyrrolidinium family, it is non-volatile, non-flammable, and exhibits high thermal decomposition thresholds, drastically reducing risks associated with thermal runaway. (3) Anodic vs. Cathodic Stability: The aliphatic pyrrolidinium ring provides superior resistance against reduction at negative potentials compared to aromatic cations (like imidazolium), lending itself well to stable cycling with carbonaceous anodes or lithium metal.

Part Number	CBESPy12TFSI (C-BES-Py12TFSI)
CAS	223436-99-5
Chemical Formula	C₉H₁₆F₆N₂O₄S₂
Appearance	Solid/powder to crystal
Purity	>99.9% (Battery Grade) Humidity level<100 ppm
Molecular Weight	394.35 g/mol
Density	~1.183 g/cm3
Package Size	25 g, 50 g, and 100 g/bottle

Notes: Please try to store the Py12TFSI in a dry place (dryroom or glovebox is preferred option). 

References: 

1. M. Jabeen, et al. Thermally Adaptive PVDF-HFP/Ionic Liquid Electrolyte Enabling Stable SEI/CEI Formation in Sodium Metal Batteries, Adv. Funct. Mater., 2026, 36, e25343
2. S. A. Langevin, et al. Enabling wide temperature battery operation with hybrid lithium electrolytes, Chem. Commun. (2024) 60 (40): 5298–5301.