FPPN (Pentafluoro(phenoxy)cyclotriphosphazene, >99.0%) as Battery Electrolyte Additive, 5 g/bottle, CBEAFPPN

Pentafluoro(phenoxy)cyclotriphosphazene (commonly designated as FPPN) is a specialized heterocyclic organophosphorus compound engineered as a multifunctional electrolyte additive for advanced lithium-ion and sodium-ion batteries. Featuring a stable P3N3 cyclic phosphazene core substituted with five fluorine atoms and one electroactive phenoxy group, FPPN simultaneously delivers exceptional flame retardancy and dual-side interfacial stabilization.

Its functional roles in electrolyte engineering are: (1) Simultaneous SEI and CEI Passivation: Because of its tailored frontier orbital energy levels, FPPN undergoes sacrificial electrochemical reactions on both electrodes simultaneously during initial formation. It constructs uniform, ultrathin, inorganic-rich Solid Electrolyte Interphases (SEI) on anodes and Cathode Electrolyte Interphases (CEI) on positive electrodes. (2) Robust Flame Retardancy & Thermal Safety: The high phosphorus, nitrogen, and fluorine content imparts powerful flame-suppressant characteristics. FPPN effectively quenches radical chain reactions during thermal abuse, significantly raising the self-extinguishing threshold and delaying exothermic decomposition. (3) Mitigation of Transition-Metal Dissolution: The nitrogen- and phosphorus-rich heterocyclic degradation products coordinate strongly with active transition metal sites on high-capacity oxide surfaces, suppressing catalytic side reactions and structural degradation.

The primary electrochemical domains are: (1) High-Energy Sodium-Ion Batteries (SIBs): Integrated into advanced carbonate or ester-based electrolytes to stabilize hard carbon anodes and layered oxide cathodes, supporting extended cycle stability and wide temperature operation in large-format pouch cells. (2) High-Voltage Lithium-Ion Chemistries: Deployed alongside high-nickel layered oxide cathodes (such as NMC811) and silicon-containing composites to mitigate capacity fade, reduce gas evolution, and suppress thermal runaway risks under aggressive charging profiles

Part Number	CBEAFPPN (C-BEA-FPPN)
CAS	33027-68-8
Chemical Formula	C6H5F5N3OP3
Appearance	Colorless Liquid
Purity	>99.0%
Molecular Weight	323.04 g/mol
Package Size	5 g/bottle

Notes: Please store the FPPN liquid in the dry place (glovebox is the best).

References: 

1. Y. Liao, et al. Pentafluoro(phenoxy)cyclotriphosphazene Stabilizes Electrode/Electrolyte Interfaces for Sodium-Ion Pouch Cells of 145 Wh Kg−1, Adv. Mater., 2024, 36, 2312287
2. T. Dagger, et al. Electrochemical performance evaluations and safety investigations of pentafluoro(phenoxy)cyclotriphosphazene as a flame retardant electrolyte additive for application in lithium ion battery systems using a newly designed apparatus for improved self-extinguishing time measurements, Journal of Power Sources, 2017, 342, 266-272