Industry Context: Separators Are Becoming the Critical Link in Battery Safety
 
Lithium battery separators are known as the “third electrode” of a battery. Although they do not directly participate in electrochemical reactions, their performance determines battery safety, capacity, and cycle life. In 2025, China’s lithium-ion battery separator shipments reached 32.85 billion square meters, a year-on-year increase of 44.4%, with projections reaching 36.7 billion square meters in 2026. The global lithium battery separator market was valued at approximately US7.5 billion by 2032, with a CAGR of approximately 7.8%.‌
 
However, conventional polyolefin separators suffer from severe thermal shrinkage at elevated temperatures, which is a primary cause of thermal runaway in power batteries. The industry is advancing along three main technical fronts: higher porosity uniformity, lower thermal shrinkage, and greater puncture strength.‌
 

Our Solution: Meltblown Substrate Redefining the Safety Baseline
 
We supply PP meltblown nonwoven substrates as coating base materials for lithium battery separators. Our substrates offer thickness control within 30-40μm, submicron pore size regulation, and porosity coverage from 40% to 70%.
 
Advantage 1: Superior Thermal Stability. Research demonstrates that meltblown-process separators exhibit virtually no shrinkage at 150°C, significantly outperforming conventional dry-process separators in heat resistance. This fundamentally reduces the risk of short circuits under high-temperature operating conditions.
 
Advantage 2: Ultra-High Electrolyte Uptake. Meltblown separators achieve an electrolyte absorption rate of 292.53% — 2.2 times that of dry-process separators and 2.3 times that of wet-process separators. Higher electrolyte uptake translates directly into more efficient ion transport channels, enhancing both rate performance and cycle life.
 
Advantage 3: Perfect Compatibility with Electrospinning Coatings. Using PP meltblown fabric as the substrate layer with dual-sided electrospun LCP polymer coatings, the resulting composite separator achieves pore sizes of 150-200nm, porosity of 62-68%, and an electrolyte retention rate of up to 343%. The three-dimensional network structure of the meltblown substrate provides a uniform attachment interface for coatings while reinforcing the overall mechanical strength of the composite separator.‌
 
Advantage 4: Lightweight and Thin-Profile Design. Our meltblown substrates can be customized to 10-20μm thickness and 30-60 g/m² basis weight, minimizing the negative impact on battery energy density while maintaining mechanical integrity.
 

Application Scenarios
• Power Batteries: Coating substrate for high-safety separator requirements
• Energy Storage Batteries: Electrolyte retention layer for long-cycle-life applications
• Semi-Solid-State Batteries: Substrate compatible with emerging LATP and advanced coating systems 

Collaboration Model
We operate as a meltblown substrate supplier, partnering with separator coating manufacturers through sample validation and joint development. We support small-batch sampling and can adjust substrate thickness, pore size, and basis weight to match your specific coating process — whether ceramic coating, PVDF coating, or LCP electrospinning.
 
Contact us for technical datasheets and samples.