RbOTf {[Rubidium Triflate], >99.95%} Powder as Electrolyte Additive for Lithium-Ion Battery, 10-50 g/bottle, CLIBEARbOTf

Rubidium Triflate (RbOTf}, or Rubidium trifluoromethanesulfonate, RbCF3SO3) is an alkali metal salt functional additive evaluated in non-aqueous electrolytes for advanced rechargeable batteries.  While closely related to RbTFSI, RbOTf combines the large Rb+ cation with a smaller, rigid triflate anion (CF3SO3^-) rather than the bulkier, flexible imide anion (TFSI-).

Self-Healing Electrostatic Shield (SHES): Like other heavy alkali cations (Cs+, Rb+), Rb+ operates through an electrostatic shielding mechanism on lithium-metal anodes: The reduction potential of Rb+ (~ -2.93 V vs. SHE) is slightly less negative than that of Li+ (~ -3.04 V). At high local current densities (e.g., emerging dendrite tips), accumulated Rb+ ions create a localized positive electric field without being reduced into metallic rubidium. This electrostatically repels incoming Li+ ions to adjacent flat areas, forcing smooth, planar lithium deposition.

Triflate-Derived Interphase Construction: The triflate anion (OTf-) exhibits distinct decomposition characteristics on anode and cathode surfaces: Under reductive conditions at the lithium anode, OTf- breaks down to form an inorganic-rich Solid Electrolyte Interphase (SEI) composed of lithium fluoride (LiF) and sulfur species (Li2S). This layer offers high mechanical strength and fast Li+ interfacial transport. Unlike imide salts (TFSI-), which can cause aluminum current collector pitting at higher potentials (> 3.8 V), triflate species are generally less corrosive toward aluminum, providing better high-voltage current collector stability.

Part Number	CLIBEARbOTf (C-LIB-EA-RbOTf)
Chemical Formula	RbSO₃CF₃
Appearance	White Powder
Purity	>99.95% (Battery Grade)
Molecular Weight	234.53 g/mol
Package Size	10 g, 25 g, and 50 g/bottle

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

References: 

1. T. J. Leckie, et al. Secondary alkali-metal salts in supporting electrolytes for lithium polysulfide flow batteries, EES Batteries, 2026, DOI: 10.1039/d6eb00050a.
   
2. K. Rajsundar, et al., Rational engineering of electrolytes for lithium–sulfur batteries, Chemical Communications, 2025, 61, 12618–12642