The lithium-ion battery separator is a critical functional thin-film material within lithium-ion batteries, used to physically separate the positive and negative electrodes while allowing lithium ions to freely pass through during charging and discharging. Unlike ordinary insulating films, this separator must possess high porosity, stable electrochemical compatibility, and reliable mechanical strength at extremely thin thicknesses to ensure the safe operation of the battery under high energy density conditions. Its performance directly impacts the battery's safety, cycle life, and rate performance, making it one of the indispensable core components in lithium-ion battery systems.

Lithium Ion battery separator Parameters:

Advantages and Features :

High Electrical Insulation

The separator has insulation resistance above 10¹⁶ Ω·cm, which helps isolate the positive and negative electrodes inside lithium-ion batteries. This high insulation level reduces the risk of internal electron conduction and direct short circuit. For battery manufacturers, better insulation performance helps improve cell safety and reduces quality risks during assembly, testing and long-term use.

Controlled Pore Structure

The pore size is usually between 10 nm and 500 nm, with porosity generally between 40% and 74%. This pore structure allows lithium ions to pass through while helping block direct electrode contact. For B2B buyers, proper pore control supports better charge-discharge efficiency, more stable electrolyte absorption and lower risk of unstable battery performance.

1、PP PE Material Base

The separator is made from polypropylene and polyethylene, two polymer materials commonly used in lithium battery separator production. These materials support electrical insulation, chemical resistance and flexible film processing. For battery material buyers, PP and PE structure provides a practical balance between safety, mechanical strength and production adaptability.

2、Strong Puncture Resistance

The separator puncture strength can reach more than 0.5 N/μm, helping it resist local pressure from electrode material expansion or assembly stress. This is important because separator puncture can lead to direct electrode contact and serious safety failure. For battery factories, stronger puncture resistance helps reduce defect risk during winding, stacking and cell operation.

3、Stable Tensile Strength

The tensile strength can reach 30 MPa in the longitudinal direction and 20 MPa in the transverse direction. This helps the separator maintain shape stability under mechanical stress during battery manufacturing and use. Better dimensional stability supports smoother ion transmission channels and reduces deformation-related production problems.

Application 

1、New Energy Vehicle Batteries

New energy vehicle battery manufacturers need separators that support safety, cycle stability and high power output. Lithium Ion Battery Separator helps isolate electrodes while allowing lithium ions to move during repeated charging and discharging. High insulation and puncture resistance are important for reducing internal short-circuit risk in power battery cells.

2、Electric Vehicle Battery Packs

Electric vehicle battery packs experience frequent charge and discharge cycles, so separator stability directly affects battery life and maintenance cost. A separator with controlled pore size and good tensile strength can help improve ion transmission and structural reliability. For EV battery producers, stable separator quality supports safer pack performance and longer service planning.

3、Mobile Device Batteries

Mobile device batteries require thin, stable and reliable internal materials because the battery space is limited. Lithium Ion Battery Separator supports compact battery structures while helping maintain electrical isolation between electrodes. For manufacturers of smartphones, tablets and portable electronics, separator consistency helps improve safety and usable battery time.

4、Energy Storage Systems

Energy storage systems require batteries that can operate for long cycles and respond reliably during charge-discharge changes. The separator helps maintain ion movement and internal safety inside each lithium-ion cell. For energy storage battery producers, stable separator performance supports long-term system operation in grid storage, backup power and commercial energy projects.

5、Aerospace Battery Supply

Aerospace and defense battery applications require separators with strong reliability under demanding conditions. High mechanical strength and chemical stability help the separator maintain function under vibration, temperature changes and long operating cycles. For specialized battery manufacturers, separator selection is a critical step before high-reliability battery assembly.

Factory Supply Ability:

Jiangmen Material Base

Our company was established in 2008 and is located in Jianghai District, Jiangmen City. Our factory integrates production, warehousing, processing, distribution and after-sales service, giving buyers a more complete supply structure for packaging paper, film and new material products. For Lithium Ion Battery Separator buyers, this background supports more practical communication from specification discussion to order delivery.

New Material Development

Our company focuses on research and development of new material technology, technology development, technology transfer and technical consulting. This helps our team support buyers who need more than standard separator supply. For customized separator orders, technical communication is important because material width, thickness, pore structure and mechanical properties must match the buyer’s battery process.

Custom Separator Orders

Our factory supports customized material width and thickness according to customer requirements, with OEM and ODM service available. This is useful for battery cell manufacturers, trial-line buyers and material distributors that need separator specifications adapted to different battery structures. Monthly capacity and production schedule should be confirmed with our team based on final width, thickness, quantity and packaging requirements.

Carton Protection Handling

The separator is packed in cartons and should not be subjected to impact during storage or transportation. Our team can discuss packing, carton labeling and delivery preparation based on order size and destination. For battery material buyers, proper packaging control helps protect separator film from compression, deformation and handling damage before production use.

Buyer Notes:

1、Define Film Thickness

Buyers should confirm separator thickness and width before ordering, because these specifications affect battery design, winding tension and electrolyte absorption. A wrong thickness may change internal resistance, cell volume and production compatibility. Custom dimensions should be confirmed with drawings or technical data before bulk manufacturing.

2、Control Storage Humidity

The separator should be stored at 20℃ to 25℃ and humidity below 40%. Excessive moisture may affect separator performance, while temperature fluctuation can cause material aging or deformation. For battery factories, stable storage conditions help keep separator quality consistent before cell assembly.

3、Avoid Film Damage

During transportation, handling and battery assembly, the separator should be protected from squeezing, scratching and folding. Mechanical damage can destroy pore structure and increase internal short-circuit risk. Buyers should prepare clean handling tools and operator procedures before using separator rolls or sheets in production.

4、Prevent Chemical Contact

The separator should avoid contact with oil, acid, alkali and other unsuitable chemicals before battery assembly. Chemical contamination may change material structure, pore behavior or electrolyte compatibility. For production teams, clean workshop control and regular incoming inspection are important before the separator enters battery manufacturing.

Battery Material Specification Review

Our team can support Lithium Ion Battery Separator orders for battery cell manufacturers, new energy battery suppliers, energy storage system producers, mobile device battery factories and material distributors. Separator material, width, thickness, packaging method, OEM or ODM requirements, storage conditions and shipment planning can be discussed before quotation.

Prepare Your Separator Inquiry - For Lithium Ion Battery Separator procurement, send our team your battery type, target separator width, required thickness, estimated order quantity, packaging needs and technical performance requirements. We can review your specification first, then prepare a quotation based on the confirmed separator structure and purchasing plan.

For more separator materials, paper products, release films and new material supply information from XINYUANSHUN, visit:

https://www.xyspaper.com/