Lithium-ion Battery Separator
LiB Separator for 
OVERVIEW
SUNFINE™ was begun to be used by lithium-ion battery (LiB) industry for separator applications at an early stage of LiB development and has since been fulfilling the needs of customers.
There are a wide array of high-quality grades of SUNFINE™ ideal for this application. Asahi Kasei has been continuing research and development to create and constantly improve raw materials to meet the demands placed on the latest high-function LiB separators.
Lithium-ion Battery SeparatorEXAMPLE
Lithium-ion Battery SeparatorGRADES
| Physical properties | Test method | BH500 | UH650 | |
|---|---|---|---|---|
| Average molecular weight (Mv) | - | ASAHI KASEI PE METHOD | 0.50×106 | 0.90×106 |
| Bulk density | g/cm3 | ASAHI KASEI PE METHOD | 0.5 | 0.5 |
| Density | g/cm3 | ASAHI KASEI PE METHOD | 0.94 | 0.94 |
| Average particle size d50,3 | μm | ASAHI KASEI PE METHOD | 150 | 140 |
| Melting point | ℃ | ASAHI KASEI PE METHOD | 137 | 137 |
| Prescription of additives | Yes | Yes | ||
Lithium-ion Battery SeparatorPROPERTY
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High-strength separators
The grade design adopted for SUNFINE™ features a molecular weight distribution within a narrow range. The content of low molecular weight ingredients causing the deterioration of strength in grades of SUNFINE™ for separator applications is reduced, increasing their puncture-resistance. That leads to higher impact resistance and improved battery safety.
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Very low metal residues
The trace metal residues in SUNFINE™ derived from catalysts are very low, a feature achieved using advanced catalyst technology. This reduces the problems caused by increased pressure in the extruder when SUNFINE™ is used. It also minimizes the risk of equipment corrosion.
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Quality stability
SUNFINE™ maintains highly stabile physical properties in every lot through intensive plant management and advanced catalyst technology, enabling customers to achieve higher production stability and reduce costs.
SUNFINEAPPLICATIONS
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Lithium-ion Battery Separator
The high quality, optimized grades of SUNFINE™ improve the functions of lithium-ion battery (LiB) separators and achieve their stable production.
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Lead Acid Battery Separator
Asahi Kasei proposes UHMWPE with low contaminants and stable physical properties to help batteries achieve a high level of safety.
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High-strength Fiber
Developed from Asahi Kasei's experience supplying industry-leading companies, it offers a distinguished high molecular weight grade that helps achieve the functional enhancement of fibers.
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Molding
Asahi Kasei offers several grades suited for molding applications. They contain a low level of foreign matter and have high whiteness. Some grades meet standards for food applications.