Wuxi SEMCORP New Materials Technology Co., Ltd.

A polymer nano-porous functional membrane made by wet-process bidirectional stretching technology, serving as the core isolation barrier between the cathode and anode of lithium-ion batteries; it determines the interfacial structure, internal resistance, capacity, cycle life and safety of the cell. SEMCORP wet-process base films offer high and well-matched MD/TD strength, reducing the risk of internal short circuits caused by lithium dendrite penetration. Thickness covers 3 to 20 μm with uniform pore size (about 0.03-0.05 μm) and 40-50% porosity, meeting the diverse needs of power, energy-storage and 3C consumer batteries.

Thickness: 3-20 μm; Porosity: 40-50%; Pore size: 0.03-0.05 μm; Air permeability (Gurley): 180-250 s/100ml; Puncture strength: ≥300-500 gf; Heat shrinkage (105°C/1h): MD≤4.0%, TD≤1.5%

• Power batteries
• Energy-storage batteries
• Consumer electronics batteries (3C/drones/wearables/robots)

The thinnest wet-process separator base film currently in mass production at SEMCORP for power batteries. Thanks to new wide-width, high-strength equipment at the Yuxi base, the 5μm ultra-thin high-strength base film has been scaled up to mass production. Precise control of the polymer condensed state through structure regulation and multi-machine collaboration overcomes the “thin means fragile” bottleneck, balancing thickness, strength and ion permeability to improve cell energy density and fast-charging performance.

Thickness: 5 μm; Needle-puncture strength: ≥550 gf; Thickness reduction vs 7 μm: 28.5%; Internal resistance reduction: 20.9%; Tensile strength: ≥400 MPa; Film-break temperature (X series): 230°C

• High-energy-density power batteries
• Fast-charging power batteries
• Premium energy storage

One of the mainstream thickness specifications of wet-process base films (commonly 7-9 μm), balancing strength, ion transport speed and manufacturing cost; widely used in power and energy-storage batteries.

Thickness: 7 μm; Air permeability: approx. 200 s/100ml; Porosity: 40±5%; Film-break temperature (standard base film): 150°C

• Power batteries
• Energy-storage batteries

A 9 μm wet-process lithium-ion battery base film in mass production at SEMCORP. As a thicker specification it offers better mechanical strength and production yield, suitable for cell designs with higher safety and strength requirements.

Thickness: 9±1.5 μm; Areal density: 5.5±1.0 g/m²; Porosity: 36±5%; Air permeability: 180±50 s/100ml; Puncture strength: ≥300 gf; Heat shrinkage (105°C/1h): MD≤4.0%, TD≤1.5%; Tensile strength: MD≥1500 kgf/cm², TD≥1000 kgf/cm²; Elongation at break: MD≥30%, TD≥60%

• Power batteries
• Energy-storage batteries
• Consumer electronics batteries

A 12 μm wet-process lithium-ion battery base film from SEMCORP. This thicker grade offers superior strength and safety, and is commonly used in power and energy-storage cells with demanding puncture and heat-shrinkage requirements.

Thickness: 12±2 μm; Areal density: 7.0±1.0 g/m²; Porosity: 40±5%; Air permeability: 200±50 s/100ml; Puncture strength: ≥350 gf; Heat shrinkage (105°C/1h): MD≤4.0%, TD≤1.5%; Tensile strength: MD≥1500 kgf/cm², TD≥1000 kgf/cm²; Elongation at break: MD≥30%, TD≥60%

• Power batteries
• Energy-storage batteries

A 16 μm wet-process lithium-ion battery base film from SEMCORP. A thick-grade film with high mechanical strength, intended for cell scenarios where safety and puncture resistance are critical.

Thickness: 16±2 μm; Areal density: 9.2±1.0 g/m²; Porosity: 40±5%; Air permeability: 230±50 s/100ml; Puncture strength: ≥450 gf; Heat shrinkage (105°C/1h): MD≤4.0%, TD≤1.5%; Tensile strength: MD≥1500 kgf/cm², TD≥1000 kgf/cm²; Elongation at break: MD≥30%, TD≥60%

• Power batteries
• Energy-storage batteries
• Consumer electronics batteries

A composite separator formed by coating functional materials (ceramic, PVDF, aramid, boehmite, etc.) onto wet-process or dry-process base films to reinforce heat resistance, adhesion, wettability and safety. SEMCORP builds an integrated high-safety “base film + coated film” solution that can be modularly combined with fast-charging, high-capacity and long-life series to precisely match different cell designs and safety targets.

Film-break temperature (high film-break X series): 230°C; Safety window: 90°C; Reduction of film-break area: approx. 60%; Coating adhesion (PVDF): ≥30 N/m; Ceramic-coating heat shrinkage at 200°C: <5% (MD/TD)

• Power batteries
• Energy-storage batteries
• Consumer electronics batteries
• Support for solid-state / semi-solid-state batteries

A high-purity nano alumina or boehmite ceramic layer is precisely coated on one or both sides of the base film (dry- or wet-process), forming a heat-resistant “armor” that significantly raises the film-break temperature and thermal stability of the separator and blocks thermal-runaway propagation.

Heat-resistant film-break temperature: 180-200°C; Heat shrinkage at 200°C: <5% (MD/TD); Coating mode: single-side / double-side; Coating material: nano alumina / boehmite

• Power batteries
• Energy-storage batteries
• High-safety cells

PVDF is dispersed (aqueous) or dissolved (solvent-based) and uniformly coated onto the base film. During thermal lamination between separator and electrodes the effective contact area is large and bonding is strong, significantly reducing the cell casing rejection rate while improving low-temperature discharge and fast-charge cycle life.

Coating adhesion: ≥30 N/m; Base film thickness range: 5-16 μm; Coating system: aqueous / solvent-based; Functions: enhanced electrode bonding, lower interfacial internal resistance

• Power batteries
• Consumer electronics batteries
• Fast-charging cells

PVDF or aramid is blended with nano ceramic into a slurry that is uniformly coated onto dry-process or wet-process base films. The product combines high heat resistance with bonding between the separator and the electrodes, while offering low cost and high efficiency.

Coating composition: PVDF/aramid + nano ceramic; Heat-resistant film-break temperature: 180-200°C; Coating adhesion: ≥30 N/m; Features: high heat resistance + adhesion; Advantages: low cost, high efficiency

• Power batteries
• Energy-storage batteries

Aramid is a polymer material with excellent heat resistance. Aramid coating greatly raises the film-break temperature of the separator, markedly reduces heat shrinkage and improves electrolyte wettability, enhancing battery safety and performance simultaneously; it has already won overseas mass-production orders.

Film-break temperature: ≥180°C (greatly improved over standard base film); Heat shrinkage at 200°C: <5%; Electrolyte wettability: improved; Coating material: aramid

• High-safety power batteries
• Premium consumer electronics batteries

A breakthrough flame-retardant separator developed by SEMCORP: at the separator level it does not burn when exposed to open flame, mitigating the risk of cell burning to a certain extent. It is an advanced product of the “base film + coated film” high-safety solution.

Flame-retardant behavior: non-combustible under open flame; Heat-resistant film-break temperature: 180-200°C; Heat shrinkage at 200°C: <5%; Safety level: mitigates cell burning risk

• High-safety power batteries
• Energy-storage batteries

Packaging material for pouch lithium-ion batteries, typically a multilayer composite of PET, NY, aluminum foil and CPP laminated by a dry or thermal process. It is lightweight, easy to seal, formable and durable, suitable for high-energy-density pouch cells. SEMCORP plans to reach an aluminum-plastic film capacity of 380 million square meters by the end of 2025.

Consumer grade: ≤113 μm; Power/energy-storage grade: ≥153 μm; Formability improvement: +50% vs conventional; Expected service life: ≥10 years; Planned capacity (2025): 380 million m²

• Power lithium batteries
• Energy-storage lithium batteries
• Consumer lithium batteries

Aluminum-plastic film produced by coating and dry lamination, featuring advantages in formability and inner-layer insulation. It is used in consumer (≤113 μm), power and energy-storage (≥153 μm) pouch batteries.

Grade: ≤113 μm (consumer), ≥153 μm (power/energy storage); Formability improvement: +50% vs conventional; Process: coating + dry lamination; Advantages: formability, inner-layer insulation

• Consumer pouch batteries
• Power pouch batteries
• Energy-storage pouch batteries

Aluminum-plastic film produced by coating, dry lamination and extrusion lamination, featuring advantages in heat resistance and cost. It is used in consumer (≤113 μm), power and energy-storage (≥153 μm) pouch batteries.

Grade: ≤113 μm (consumer), ≥153 μm (power/energy storage); Heat-sealing temperature: 130-160°C; Process: coating + dry lamination + extrusion lamination; Advantages: heat resistance, cost

• Consumer pouch batteries
• Power pouch batteries
• Energy-storage pouch batteries

A BOPP film widely used for the outer packaging of cigarette packs and cartons, offering excellent optical, mechanical, abrasion-resistance and barrier properties. It provides close-fitting protection for cigarettes, enhances visual appeal, blocks aroma loss and extends shelf life. Note: a packaging-business product of the SEMCORP Group, cross-supplemented from the parent company’s website; it is not part of Wuxi SEMCORP’s core wet-process separator business.

Shrinkage (standard film): <5.0%; Shrinkage (slight/medium-shrink film): 3.0-7.5%; Shrinkage (shrink film): >6.0%; Features: high optical / mechanical / abrasion / barrier performance

• Cigarette pack packaging
• Cigarette carton packaging

BOPP plain film is widely used in food packaging, adhesive-tape backing, printing and other fields to improve the packaging quality of products. Note: a packaging-business product of the SEMCORP Group, cross-supplemented from the parent company’s website.

Thickness: 12-60 μm; Number of layers: 3-layer co-extruded BOPP; Applications: food packaging / tape backing / printing

• Food packaging
• Adhesive-tape backing
• Printing packaging

Specialty BOPP films of various types and properties with a wide range of uses, such as laser base film, crystal film, transfer base film, matte film, antibacterial film and customized packaging films, greatly increasing the added value of products. Note: a packaging-business product of the SEMCORP Group, cross-supplemented from the parent company’s website.

Base film thickness: 12-50 μm; Types: laser base film / crystal film / transfer base film / matte film / antibacterial film (5+ types); Features: high added value, customizable

• Laser packaging
• Transfer metallizing
• Matte packaging
• Antibacterial packaging