Dry vs Wet Separator Technology

A look at dry vs wet separator technology and a look at the next developments in the roadmap.

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Author: Paul Wen from ZIMT

The separator is a porous membrane placed between electrodes of opposite polarity, permeable to ionic flow but preventing electric contact of the electrodes.

The dry vs wet differentiation is essentially the difference in the way they are produced in the factory. From PolyPropylene (PP) or PolyEthylene (PE) particles that are used to produce the film:

• PP Dry Separator: the separator is produced without solvents being used in the process
• PE Wet Separator: the separator is produced using solvents.

ItemWet-SeparatorDry-SeparatorCommentsRaw materialPEPPPE raw material is ~50% more expensive than PPRaw material melting Point135°C165°CHigher safety buffer for dry separatorThickness7μm to 9μm12μm to 16μmWet separator is thinner and hence enables higher energy density at cell level.Puncture strengthhigherlowerWet separator is easier to pass nail penetration test.Solvent useyesnoDry separator is more environment friendly.Production costhigherlowerWet is ~50% more expensive

China produces around 80% of the world&#;s separators. Out of these, 70% are wet process separators and 30% are process separators. As NMC battery are targeting higher energy density, manufacturers are mostly using wet separators. This is due to wet separators are 30%-40% thinner than dry separators, it can save more space for other components. As for LFP batteries, both wet and dry separators are used by cell manufacturers. Although in the beginning wet separators was more common in LFP, the demand for more affordable cells has become the key factor that driving manufacturers to opt for dry separators. BYD is one of the biggest and well-known manufacturers that began to use dry separators since and now they are using dry separators in their blade battery.

One last comment to add is that there are more differences in characteristics between dry and wet separators, and some characteristics can be modified through adjustments in the production process and through various functional coating options. For example, once a customer asked us to deliver high porosity separators to enable better performance in charging/discharging. It took us some time modifying the process and testing samples with the customer, and now we have this solution ready in our portfolio.

What is coming next in separator technology?

1. Becoming thinner and thinner, to achieve higher energy density. Wet separator is heading 5μm thickness. Dry separator is heading 10μm. ZIMT is testing 10μm product with customers, expect mass shipping in .
2. Enhancing puncture strength by optimizing production process and material used.
3. Designing additional functional coatings to improve performance in heat shrinkage, interface stability, and wettability to meet various customer requirements.

ZIMT

Established in . It is a national high-tech enterprise under Zhongxing New Group specializing in the research and development, production and sales of lithium-ion battery separators.

PE (Polyethylene) battery separators are an essential component in battery technology, playing a crucial role in ensuring the safe operation and long life of batteries. These separators act as a barrier between the anode and cathode, preventing short circuits while allowing ions to flow freely during the battery&#;s charge and discharge cycles. This guide will help you understand what PE battery separators are, their key benefits, and how to choose the right wholesale supplier for your needs.

1. What Is a PE Battery Separator?

PE battery separators are thin, porous films made from polyethylene material. They are used in various types of batteries, including lithium-ion, lead-acid, and other rechargeable batteries. The separator ensures that the anode and cathode do not come into direct contact, preventing short circuits, while allowing ions to pass through the pores to enable the flow of electricity.

PE separators are designed to be chemically stable, resistant to high temperatures, and capable of absorbing electrolytes. Their unique properties make them ideal for a wide range of battery applications, from consumer electronics to electric vehicles.

2. Advantages of PE Battery Separators

PE separators offer several key benefits that make them a popular choice for battery manufacturers:

• Durability: PE separators are highly durable and resistant to damage caused by heat, pressure, and chemical reactions.

• High Porosity: The high porosity of PE separators allows for effective ion transport, leading to efficient battery performance.

• Temperature Resistance: PE separators can withstand high temperatures, which is essential for preventing thermal runaway in lithium-ion batteries.

• Cost-Effectiveness: PE separators are relatively inexpensive to produce, making them a cost-effective option for large-scale battery production.

These benefits make PE separators an essential component in ensuring the safety, performance, and longevity of batteries.

PE Battery Separators

3. Key Considerations When Purchasing Wholesale PE Battery Separators

When sourcing PE battery separators in bulk or wholesale quantities, there are several factors to consider to ensure you are getting the best quality material for your needs:

• Thickness and Porosity: The thickness and porosity of the separator will impact the battery&#;s performance. Choose a separator that matches the specific requirements of your battery, balancing ion flow and structural integrity.

• Material Quality: Ensure the PE separators are made from high-quality, virgin polyethylene to ensure consistent performance and reliability in your batteries.

• Electrolyte Absorption: The separator should be able to efficiently absorb electrolytes for better conductivity and battery life. Ensure that the PE separator is compatible with the electrolyte used in your specific battery chemistry.

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• Heat Resistance: Depending on your application, choose a separator that can withstand the required temperature range without degrading or causing safety issues.

By carefully considering these factors, you can ensure that the PE battery separators you purchase meet your battery production needs.

4. Where to Buy Wholesale PE Battery Separators

There are several options when looking for wholesale PE battery separators, from online marketplaces to specialized manufacturers. Here are some tips for finding a reliable supplier:

• Reputable Manufacturers: Look for manufacturers with experience in the battery industry. They should have a proven track record of producing high-quality PE separators that meet industry standards.

• Certifications and Compliance: Check whether the supplier&#;s products meet relevant certifications such as ISO, UL, or other safety and quality standards. This ensures that the separators are safe and reliable.

• Custom Orders: Some suppliers offer custom-made separators tailored to your specific needs, such as particular sizes, porosities, or temperature ratings. This is beneficial for specialized battery applications.

• Bulk Pricing and Discounts: When purchasing in bulk, ask suppliers for competitive pricing or bulk discounts to help reduce your overall production costs.

Online platforms like Alibaba, industry-specific trade shows, and established manufacturers can help you find the best suppliers for wholesale PE battery separators.

5. Frequently Asked Questions About PE Battery Separators

1. What are the common applications of PE battery separators?

PE battery separators are used in a variety of battery types, including lithium-ion, nickel-metal hydride (NiMH), and lead-acid batteries. They are commonly found in consumer electronics, electric vehicles, energy storage systems, and power tools.

2. How does the quality of the PE separator affect battery performance?

The quality of the PE separator directly affects battery performance. A high-quality separator ensures efficient ion flow, stability, and longer battery life. Poor-quality separators may result in overheating, reduced performance, or short-circuiting.

3. Are PE battery separators reusable?

No, PE battery separators are typically designed for single use within a battery. Once the battery is discharged or reaches the end of its life, the separator is no longer effective and must be replaced.

4. How do I know which PE separator is best for my battery?

The best PE separator for your battery depends on factors such as the battery's chemistry, required temperature resistance, and porosity needs. Consult with a supplier or manufacturer who can recommend the right separator based on your battery's specific requirements.

5. Can I customize PE battery separators for my application?

Yes, many manufacturers offer customization options for PE battery separators, including thickness, porosity, and other features. Custom orders can help you meet specific battery performance and safety needs.

Conclusion

PE battery separators are a critical component in modern battery technology, offering several advantages such as durability, high porosity, and heat resistance. By understanding the key considerations when purchasing wholesale PE separators, you can ensure that you choose the right product for your battery applications. Whether you&#;re looking for cost-effective solutions or specialized designs, selecting a reliable supplier is key to ensuring the performance and safety of your batteries.

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