Fluoroethylene Carbonate(FEC), Battery Grade 500g

Fluoroethylene Carbonate (FEC), Battery Grade 500g

Chemical Name: Fluoroethylene Carbonate
CAS Number: 114435-02-8
Product Code: EL114435-02-8
Grade: Battery Grade
Brand: Xnergy

Product Introduction

Fluoroethylene carbonate (FEC) has become the most widely used electrolyte additive for silicon-based anodes. Unlike EC, FEC decomposes at a higher reduction potential and generates a LiF-rich solid electrolyte interphase (SEI) that is both mechanically flexible and highly ion-conductive. This LiF-rich SEI can accommodate the large volume expansion of silicon particles during lithiation without cracking, dramatically extending cycle life in Gr/Si composite and Si-dominant anodes. At concentrations as low as 5–10 vol%, FEC significantly improves first-cycle coulombic efficiency and long-term capacity retention. Xnergy supplies FEC to battery-grade purity for research and scale-up applications.

Key Features

• LiF-rich SEI formation — generates a mechanically flexible, ionically conductive interphase suited to volume-expanding silicon anodes
• Higher reduction potential than EC — decomposes preferentially before carbonate co-solvents, establishing SEI before bulk electrolyte degradation
• Effective at low concentrations — 5–10 vol% in the electrolyte delivers significant cycle life improvement
• Broad anode compatibility — beneficial for Gr/Si composite, Si-dominant, and Li-metal anodes
• Purity ≥99% / H₂O ≤10 ppm — battery-grade specifications for reproducible additive studies
• Flexible volumes — available from 1 kg for lab screening to bulk for production electrolyte batches

Specification

Application Areas

• Silicon/graphite composite anode electrolyte formulation (5–15 vol% FEC)
• Silicon-dominant anode (Si >50%) full-cell cycling with improved coulombic efficiency
• Li-metal anode passivation for lithium metal batteries (LMBs)
• Na-ion battery electrolyte additive research (NaFEC analogues)
• Comparative additive studies (FEC vs. VC, FEC vs. DTD) for anode SEI optimization
• Electrolyte formulation for 18650/21700 cylindrical cells with silicon content

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