Sn(OTf)2 {Tin(III) Triflate, >99.0%} as Initiator for Gel Polymer Electrolytes (GPEs), 10-50 g/bottle, CGPEISnOTf

Tin(II) trifluoromethanesulfonate [Sn(OTf)2]—commonly referred to as tin(II) triflate (Sn(CF3SO3)2)—is a highly active Lewis acid catalyst and cationic polymerization initiator. In advanced energy storage research, Sn(OTf)2 is widely utilized to drive the in situ ring-opening polymerization of cyclic ether solvents (such as 1,3-dioxolane [DOL]) and multi-epoxy/ether crosslinking precursors for Gel Polymer Electrolytes (GPEs) and quasi-solid-state sodium and lithium metal batteries. Beyond its catalytic function, Sn^{2+} species actively participate in electrochemical reduction processes to engineer robust, hybrid protective interphases on alkali metal anodes.

The main functional roles of Sn(OTf)2 in GPEs are: (1) Initiation of Cationic Ring-Opening Polymerization (CROP): Sn(OTf)2 coordinates with cyclic ether monomers (such as DOL), activating the ring structure toward nucleophilic attack. This triggers spontaneous chain propagation to convert liquid precursors into a dimensionally stable poly(ether)-based quasi-solid gel network. (2) In Situ Formation of Hybrid SEI Passivation Layers: During initial cell formation cycles, cathodic reduction of Sn^{2+} yields a uniform metal-tin alloy and inorganic-rich Solid Electrolyte Interphase (SEI). This hybrid layer homogenizes local ionic flux, suppresses parasitic side reactions, and mitigates dendrite penetration during extended high-rate cycling.   (3) Elimination of Interfacial Resistance: The low-viscosity liquid precursor thoroughly infiltrates porous separators and dense electrode microstructures before setting. Upon in situ polymerization, it establishes intimate interfacial contact, drastically reducing boundary resistance.

Part Number	CGPEISnOTf (C-GPE-I-SnOTf)
CAS	62086-04-8
Chemical Formula	(CF3SO3)2Sn
Appearance	White Powder
Purity	>99.0%
Molecular Weight	416.84 g/mol
Melting Point	≥300 °C
Package Size	10 g, 20, and 50 g/bottle

Notes: Please try to store the Sn(OTf)2 in a dry place (glovebox is preferred).  

References: 

1. H. Deng, et al. Superior initiator reactivity and electrochemical properties of In(OTf)3 over Sn(OTf)2 for 1,3-dioxolane based solid polymer electrolyte, Journal of Energy Storage, 2024, 100, 113693
2. J. Zheng, et al. In-situ polymerization with dual-function electrolyte additive toward future lithium metal batteries, Materials Today Energy, 2022, 26, 100984