CsTFSI {[Cesium bis(trifluoromethanesulfonyl)imide], >99.95%} Powder as Electrolyte Additive for Lithium-Ion Battery, 10-50 g/bottle, CLIBEACsTFSI

CsTFSI (Rubidium bis(trifluoromethanesulfonyl)imide, {CsN(SO2CF3)2} is an alkali metal imide salt investigated as a functional additive in non-aqueous electrolytes for lithium-metal, lithium-sulfur, and liquid-polysulfide flow batteries. It combines the heavy alkali cation Rb+ with the flexible, weakly coordinating, highly fluorinated TFSI- anion.

Maximum Electrostatic Shielding (Cs+): The Cs+ cation provides an effective Self-Healing Electrostatic Shield (SHES): The standard reduction potential of Cs+ (~ -2.92 V vs. SHE) is slightly less negative than that of Li+ (~ -3.04 V). During fast charging, electric fields concentrate at microscopic peaks/dendrite tips on the lithium anode. Cs+ ions rapidly migrate to these high-field regions and accumulate without being reduced into metallic cesium. This accumulation forms a localized positive electrostatic buffer that repels incoming Li+ ions toward surrounding valleys, driving uniform, planar lithium electrodeposition across the anode surface.

Solid Electrolyte Interphase (SEI) Modification & Polysulfide Interaction: (1) F-Rich & Inorganic Interphases: The TFSI- anion decomposes at low potentials to build an inorganic-rich interphase (containing LiF, Li2S, and Li3N species), suppressing continuous solvent breakdown. (2) Polysulfide Compatibility: In lithium-sulfur (Li-S) and lithium-polysulfide (LiPS) flow battery chemistries, the incorporation of RbTFSI enhances bulk electrolyte ionic conductivity and boosts Coulombic efficiency during long-term cycling.

Part Number	CLIBEACsTFSI (C-LIB-EA-CsTFSI)
Chemical Formula	CsN(SO2CF3)2
Appearance	White Powder
Purity	>99.95% (Battery Grade)
Molecular Weight	413.04 g/mol
Package Size	10 g, 25 g, and 50 g/bottle

Notes: Please store the CsTFSI powder in the glovebox due to its sensitivity to humidity and oxygen 

References: 

1. A. Watarai, et al. A rechargeable lithium metal battery operating at intermediate temperatures using molten alkali bis(trifluoromethylsulfonyl)amide mixture as an electrolyte, Journal of Power Sources, 2008, 183, 724-729.
   
2. H. Xiang, et al., The Role of Cesium Cation in Controlling Interphasial Chemistry on Graphite Anode in Propylene Carbonate-Rich Electrolytes, ACS Appl. Mater. Interfaces (2015) 7 (37): 20687–20695.