FBSN {4-Fluoro-N,N- Dimethylbenzenesulfonamide, >99.0%} as Battery Electrolyte Additive, 5-25 g/bottle, CBEAFBSN

4-Fluoro-N,N-dimethylbenzenesulfonamide (commonly designated as FBSN) is a specialized functional organosulfur and fluorinated aromatic additive engineered for advanced lithium-ion batteries. By combining an electron-withdrawing fluorobenzene ring with a stable sulfonyl-amide (-SO2N(CH3)2) core, FBSN is tailored to address interfacial degradation and parasitic side reactions in high-voltage, nickel-rich cells.

Its functional roles in electrolyte engineering are: (1) Interfacial Passivation & CEI Stabilization: FBSN acts as a film-forming additive that participates in electrochemical reactions at the positive electrode surface. It assists in constructing a dense, robust Cathode Electrolyte Interphase (CEI) that suppresses continuous electrolyte oxidation and transition-metal dissolution. (2) Mitigation of Solvent Dehydrogenation: Studies on high-voltage and nickel-rich chemistries indicate that FBSN helps mitigate destructive solvent degradation pathways—such as suppressing the catalytic dehydrogenation of cyclic carbonates (like EC)—during prolonged cycling. (3) Enhanced Structural Integrity: The decomposition products of FBSN contribute to a rigid, ionically conductive interphase layer that accommodates surface breathing and structural strain on high-capacity oxide cathodes.

The primary electrochemical domains are: (1) High-Voltage Nickel-Rich Cells: Integrated into standard carbonate master electrolytes to support long-term cycling stability in cells paired with high-nickel layered oxide cathodes (e.g., NMC811) operating at upper voltage cutoffs exceeding 4.3 V. (2) Capacity Retention and Impedance Suppression: Deployed to reduce polarization growth, mitigate gas evolution, and prevent rapid capacity fade under aggressive charging and high-temperature operating protocols.

Part Number	CBEAFBSN (C-BEA-FBSN)
CAS	383-31-3
Chemical Formula	C 8 H 10 FNO 2 S
Appearance	White Powder
Purity	>99.0%
Molecular Weight	203.23 g/mol
Package Size	5 g, 10 g, and 25 g/bottle

Notes: Please store the FBSN powder in the dry place (glovebox is the best).

References: 

1. Y. Zou, et al. Self-repaired cathode electrolyte interphase to stabilize the high-nickel cathode interface by a sustained-release multifunctional electrolyte additive, Chemical Engineering Journal, 2024, 488, 151153
2. J. Zheng, et al. A Novel 4-Fluorophenyl Isocyanate Additive Constructing Solid Cathodes-Electrolyte Interface for High-Performance Lithium-Ion Batteries, Small, 2024, 20, 2405853