TFMP {Bis(2,2,2-trifluoroethyl) Methylphosphonate, TFEMP, >99.0%} as Flame-Retardant Battery Electrolyte Additive, 5-25 g/bottle, CBEATFMP
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Bis(2,2,2-trifluoroethyl) methylphosphonate (frequently designated as TFMP or TFEMP) is a specialized organophosphonate compound engineered specifically as a high-efficiency flame-retardant additive and interfacial modifier for advanced lithium-ion and lithium-metal batteries. By pairing a central phosphorus atom bearing a direct carbon-phosphorus (P-CH3) methyl linkage with two strongly electron-withdrawing 2,2,2-trifluoroethyl ester groups, TFMP effectively bridges thermal safety enhancement with high-voltage electrochemical stability.
Its functional roles in electrolyte engineering are: (1) High-Efficiency Flame Retardancy & Radical Scavenging: TFMP acts as a powerful dual-phase flame retardant. Upon thermal abuse or ignition, it decomposes to release phosphorus-containing active radicals in the vapor phase that quench combustion chain reactions, alongside forming a dense, fire-retardant carbonaceous-inorganic char layer on the separator and electrode surfaces in the condensed phase. (2) Interphase (SEI/CEI) Passivation: Because of its tailored reduction and oxidation behavior, TFMP participates in early-stage electrochemical formation. It assists in building a robust, hybrid inorganic-organic protective film enriched with metal fluorides (LiF) and phosphate/phosphonate decomposition species, which shields the anode and high-voltage cathode from continuous electrolyte consumption. (3) Compatibility with High-Voltage Cathodes: The strongly electron-withdrawing -CF3 groups stabilize the phosphonate core against premature oxidative degradation, allowing TFMP to be utilized in high-energy cells operating above 4.3 V.
| Part Number |
CBEATFMP (C-BEA-TFMP) |
| CAS |
757-95-9 |
| Chemical Formula |
(CF3CH2O)2P(O)CH3  |
| Appearance |
Colorless liquid |
| Purity |
>99.0% |
| Molecular Weight | 260.07 g/mol |
| Boiling Point | 183-184 °C (lit.) |
| Package Size | 5 g, 10 g, and 25 g/bottle |
Notes: Please store the TFMP liquid in the dry place (glovebox is the best).
References:
- Z. Zeng, et al. Bis(2,2,2-trifluoroethyl) methylphosphonate: An Novel Flame-retardant Additive for Safe Lithium-ion Battery, Electrochimica Acta, 2014, 129, 300-304
- T. Dagger, et al. Comparative Performance Evaluation of Flame Retardant Additives for Lithium Ion Batteries – II. Full Cell Cycling and Postmortem Analyses, Energy Technology, 2018, 6, 2023-2035