OTE (1H,1H,5H-Octafluoropentyl 1,1,2,2-tetrafluoroethyl ether, HFE-6512, >99.5%) as Battery Electrolyte Co-Solvent and Additive, 25-100 g/bottle, CBESAOTE

OTE ($1H,1H,5H-octafluoropentyl 1,1,2,2-tetrafluoroethyl ether, widely designated in commercial and battery literature as HFE-6512) is an advanced, long-chain hydrofluoroether (HFE) utilized as a high-boiling-point co-solvent, diluent, and functional additive in specialized lithium-ion and lithium-metal battery electrolytes.

The key benefits of OTE are: (1) Superior Volatility Control & High Thermal Threshold: Its high boiling point (~ 133 °C) prevents solvent loss, bubble generation, and pressure build-up during elevated-temperature cycling or aggressive thermal abuse testing. (2) Extended High-Voltage Stability Window: Expands the electrochemical stability window past 4.5 V to 5.0 V vs. Li}/Li+, protecting high-voltage nickel-rich layered oxides and high-voltage spinel cathodes from destructive oxidative decomposition. (3) Suppression of Parasitic Side Reactions: Reduces transition metal dissolution and minimizes solvent co-intercalation into graphitic or silicon-carbon anodes.Intrinsic Non-Flammability: The high mass fraction of fluorine atoms effectively quenches the flammability of conventional carbonate co-solvents.

Part Number	CBESAOTE (C-BESA-OTE)
CAS	16627-71-7
Chemical Formula	C7H4F12O
Appearance	Colorless Liquid
Purity	>99.5% (Battery Grade)
Molecular Weight	332.09 g/mol
Package Size	25 g, 50 g, and 100 g/bottle

Notes: Please store the OTE in the glovebox due to its sensitivity to humidity and oxygen. 

References: 

1. M. S. Lee, et al. An Aggregate Cluster-Dispersed Electrolyte Guides the Uniform Nucleation and Growth of Lithium at Lithium Metal Anodes, ChemistrySelect,2018, 3, 11527-11534
2. D. Guo, et al. Non-solvating additives for high-voltage sodium metal batteries, Joule, 2026, 10, 102219