Lithium bis(fluorosulfonyl)imide (LiFSI)

Description

1. Product Overview
Lithium bis(fluorosulfonyl)imide (LiFSI) is a high-performance lithium salt engineered as a next-generation electrolyte conductor for advanced lithium-ion batteries. Its primary industrial use is in electric vehicle (EV) and energy storage system (ESS) batteries, where it significantly enhances power output, low-temperature performance, and cycle life. The key value proposition over conventional LiPF₆ is superior thermal and chemical stability, reducing gas generation and capacity fade. Strategically, LiFSI is critical for enabling high-nickel cathodes, silicon-anode batteries, and 800V fast-charging platforms, making it indispensable for battery manufacturers transitioning to next-gen chemistries.

2. Key Specifications & Technical Characteristics

• Chemical composition: Lithium bis(fluorosulfonyl)imide, LiN(SO₂F)₂

• Purity level: ≥99.9% (battery grade) / Moisture content ≤20 ppm / Free acid (HF) ≤50 ppm

• Physical characteristics:

  • Form: White crystalline powder

  • Melting point: 124–128°C

  • Density: ~1.52 g/cm³ at 25°C

  • Particle size (D50): 50–150 µm (customizable)

• Packaging options: 1 kg HDPE bottle, 25 kg multi-layer foil bag with inert gas purge, 200 kg stainless steel drum, custom IBC totes

• Shelf life: 12 months when stored below 30°C in dry, inert atmosphere (dew point ≤ -40°C)

3. Core Industrial Applications

• EV lithium-ion batteries (primary industry): Used as co-salt or main salt in electrolytes for NMC 811, NCA, and high-voltage LCO cells. Delivers >20% higher cycling stability at 45°C compared to LiPF₆-only systems.

• Fast-charging batteries: Enables 3C–6C continuous charge rates with minimal lithium plating, reducing charge time to under 12 minutes for 80% SoC.

• Low-temperature operation: Maintains >80% of room-temperature capacity at -20°C, outperforming LiPF₆ by over 40 percentage points.

• Solid-state hybrid electrolytes: Improves ionic conductivity (up to 10 mS/cm) in polymer and composite systems.

• Why better: LiFSI suppresses aluminum corrosion at high voltages (>4.4V) and decomposes into solid-electrolyte interphase (SEI) with lower impedance, directly translating to longer calendar life and higher annual throughput for cell makers.

4. Competitive Advantages

• Quality consistency: ISO 9001:2025 certified, with SPC-controlled synthesis and ICP-OES trace metal analysis (each lot: Na, K, Ca, Fe, Cu <5 ppm). Batch-to-batch variation <2% RSD.

• Supply reliability: Dual-sourced raw materials + buffer stock across three regional warehouses (Asia, Europe, North America). On-time delivery rate >99% over 18 months.

• Logistics capability: UN3480 Class 9 compliant packaging; temperature-controlled dry container shipping with humidity data loggers.

• Cost competitiveness: Proprietary direct-fluorination process reduces manufacturing cost by ~18% vs. conventional LiFSI, passed to buyers as 5–7% lower annual contract pricing.

• Technical support: Dedicated application engineering team provides electrolyte formulation modeling, impurity root-cause analysis, and free initial compatibility testing with your separator/electrode materials.

• Sustainability: 100% renewable energy in final synthesis step; recyclable packaging take-back program available.

5. Commercial & Supply Information

• Minimum order quantity (MOQ): 100 kg for initial qualification; 1,000 kg for recurring commercial orders

• Bulk 20MT loading capacity: 20 metric tons per 20-foot dry container (standard palletized configuration – 80 drums of 250 kg net each)

• Lead time: 15 working days for MOQ; 25 working days for bulk 20MT after PO confirmation

• Incoterms supported: EXW, FCA, CIF, DDP (buyer’s choice)