CAS 171730-81-7 | DFEC Li-ion Battery Electrolyte Additive | China Manufacturer

Challenge: High-voltage operation (≥4.5 V) causes electrolyte decomposition and cathode degradation, limiting cycle life.

Solution: DFEC forms a thin, robust passivation layer on both anode and cathode, suppressing side reactions.

Result: Li||NCM811 full cells retain up to 75% capacity after 200 cycles at 4.5 V. DFEC-based electrolytes outperform FEC-based counterparts at high voltage.[reference:8]

Challenge: Conventional carbonate electrolytes suffer from poor ionic conductivity and sluggish desolvation at sub-zero temperatures.

Solution: DFEC as co-solvent or additive reduces Li⁺ desolvation energy barrier.

Result: Six-fold increase in desolvation rate at −20 °C compared with baseline electrolytes. DFEC outperforms FEC at low temperatures.[reference:9]

DFEC promotes the formation of a stable LiF-rich SEI on lithium metal anodes, inhibiting dendrite growth. A study using DFT simulations confirmed that DFEC undergoes a unique double-defluorination pathway generating additional LiF, potentially enhancing SEI stability.[reference:10]

DFEC improves electrolyte flash point and provides flame-retardant effects. DFEC-based electrolytes also demonstrate superior safety performance in typical safety tests.[reference:11]

Batch-specific Certificate of Analysis with GC purity and moisture data.

Safety Data Sheet for safe handling, storage, and transport documentation.

Discuss formulation compatibility, additive ratios, or custom requirements.

100g / 1kg / 25kg / 200kg. Amber glass or HDPE containers with inert gas blanket. Custom quantities available.

International express for samples; air or sea freight for bulk orders. Stock items ship in 3–7 business days.

COA with GC purity and moisture data; SDS; commercial invoice; packing list. HS code provided on request.

Store at 2–8 °C, protected from light, under inert atmosphere. Keep containers tightly closed.

Purity ≥ 99%, moisture ≤ 20 ppm. Each batch is tested by GC and Karl Fischer titration before release.

Packaged under inert gas to maintain low moisture and prevent degradation during storage and transport.

Technical support for additive ratios, co-solvent selection, and electrolyte formulation optimization.

100g R&D samples, 1kg pilot quantities, and 25kg bulk orders. Stock items ship in 3–7 business days.

DFEC is used as an electrolyte additive in lithium-ion and lithium-metal batteries. It forms a LiF-rich SEI layer that improves cycling stability and suppresses dendrite growth.

DFEC has two fluorine atoms (vs one in FEC). DFEC performs better at low temperatures and can outperform FEC at high voltage. Both form LiF-rich SEI layers, but DFEC has a unique double-defluorination pathway generating additional LiF.[reference:14]

Purity is ≥ 99% by GC. Moisture is ≤ 20 ppm by Karl Fischer titration. Batch-specific COA is available.

Yes, COA with GC purity and moisture data, and SDS are provided with every shipment.

Store at 2–8 °C, protected from light, under inert atmosphere. Keep containers tightly closed.

The smallest standard pack is 100g. Custom quantities are available. Contact us for your specific requirement.

DFEC is typically used at 1–5 wt% in the electrolyte. The optimal ratio depends on your specific battery chemistry and operating conditions. Please contact us for formulation guidance.

Yes. We can discuss custom synthesis of related fluorinated carbonates and bulk supply. Please share your target specification when inquiring.