Industry Overview
The new energy industry is currently the fastest-growing strategic emerging sector globally, with lithium batteries and photovoltaics as the two core segments. Lithium battery cathode binders represent the largest incremental market for PVDF, with demand continuing to rise as power battery and energy storage battery production capacity expands rapidly. In the photovoltaic sector, PVDF backsheet films and ETFE frontsheet films have become key materials for PV modules due to their outstanding weatherability and electrical properties. Additionally, new energy vehicle battery packs impose higher requirements on sealing materials for electrolyte resistance and high-temperature performance.
FUERTAI closely follows new energy industry development trends, providing full-range material solutions including lithium battery binders, PV film materials, and battery sealing, supporting the high-quality development of the new energy industry.
Core Material Solutions
Lithium Battery Cathode Binder: PVDF lithium battery powder is the preferred material for lithium battery cathode binders, offering excellent adhesion, electrochemical stability, and good compatibility with NMP solvent. Battery-grade PVDF requires extremely high purity (metal ion content at ppb levels) and strictly controlled molecular weight distribution to ensure slurry rheology and coating uniformity. Different cathode systems (NCM, LFP, LCO) have different PVDF molecular weight requirements that must be matched accordingly.
Battery Pack Sealing: FKM fluoroelastomer seals are used for battery pack sealing, providing excellent electrolyte resistance and high-temperature performance. Power battery pack seals must meet IP67 protection rating while withstanding high-temperature impact during cell thermal runaway. Ternary FKM peroxide cure system offers better steam and electrolyte resistance, making it the recommended choice for battery pack sealing.
PV Backsheet Film: PVDF photovoltaic-grade resin is used for solar cell backsheet protective films, offering excellent weatherability, UV resistance, and electrical insulation. 70% PVDF fluorocarbon backsheet films can achieve outdoor service life exceeding 25 years and are the mainstream choice for PV module backsheets. The PVDF backsheet layer effectively blocks moisture permeation and UV aging, protecting cells for long-term stable power generation.
PV Frontsheet Film: ETFE extrusion pellets are used for solar cell frontsheet films with light transmittance above 95%, excellent weatherability, and self-cleaning properties. ETFE film weighs only 1% of glass, significantly reducing PV module weight, suitable for flexible PV and building-integrated photovoltaic (BIPV) applications. ETFE film service life exceeds 25 years and is 100% recyclable.
Technical Highlights
| Application | Material | Key Parameter | Specification |
|---|---|---|---|
| Cathode Binder | PVDF Li-battery Powder | Metal Ion Content | <50ppb |
| Cathode Binder | PVDF Li-battery Powder | Molecular Weight | 300K~1.2M |
| Battery Pack Seal | Ternary FKM | Compression Set | ≤20% (150°C×22h) |
| PV Backsheet | PVDF PV Grade | Film Thickness | 25~50μm |
| PV Frontsheet | ETFE Film | Light Transmittance | ≥95% |
Key technical considerations for new energy materials:
- PVDF Purity Control: Battery-grade PVDF has extremely strict requirements for metal ion content (Fe, Cu, Na, etc.); production must be conducted in cleanroom environments, and packaging and transportation must prevent secondary contamination
- Molecular Weight Matching: High MW PVDF provides stronger adhesion but poorer solubility; low MW PVDF offers better solubility but weaker adhesion — select the appropriate molecular weight range based on cathode formulation and coating process
- Electrolyte Compatibility: Battery pack sealing materials must pass electrolyte immersion testing (carbonate solvents + LiPF6 salt) with volume change ≤10%
- UV Aging Testing: PV film materials must pass 3,000+ hours of QUV accelerated aging testing with performance retention ≥90%
Application Cases
Power Battery Cathode Binder: A power battery manufacturer's NCM cathode formulation using medium-high MW PVDF lithium battery powder at 2.5wt% addition, slurry solid content 72%, coating density 20mg/cm², electrode peel strength ≥15N/m, battery cycle life 2,000+ cycles with capacity retention ≥80%.
Energy Storage Battery Pack Seal: An energy storage battery cabinet seal in electrolyte environment, temperature -20°C to 60°C, using ternary FKM extruded sealing strip, IP67 protection rating, service life exceeding 10 years.
PV Backsheet Film: A PV module manufacturer's double-sided fiberglass composite backsheet with 30μm PVDF weathering layer, passing 3,000-hour QUV testing and 2,000-hour damp heat testing, outdoor operation for 5 years with power degradation ≤5%.
Selection Recommendations
FUERTAI recommends following the ’Application Scenario First’ principle for new energy material selection: For lithium battery cathode binders, select PVDF powder with appropriate molecular weight based on cathode system — medium-high MW for NCM, medium-low MW for LFP; for PV backsheet films, use PVDF PV-grade resin to ensure weatherability; for battery pack sealing, ternary FKM peroxide system is recommended. FUERTAI provides material selection consulting, sample testing, and volume supply services, and can customize specifications based on customer-specific requirements.
