Separator for Lithium-ion Batteries
The lithium-ion battery separator is one of the important internal components in the structure of a lithium battery. Its main function is to separate the positive and negative electrodes of the battery, preventing the two electrodes from touching or short-circuiting. It also allows the passage of electrolyte ions. Its performance determines the interface structure and internal resistance of the battery, directly affecting the battery's capacity, cycle, and safety performance. Toyohashi Chemical can adjust the characteristics of the diaphragm according to the development needs of battery customers, and realize customized production.
Performance Characteristics
- Excellent cleanliness
- Superior uniformity
- Chemically stable characteristics
- Outstanding mechanical properties
- Good thermal stability
- High safety performance
- Excellent porosity
- Superior tensile strength and puncture resistance
Dry Separator
Classification | Features | Microstructure | |
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Dry Separator | High performance, tear resistance 10-25μm ⸺Multicomponent technology |
Inspection Items | Unit | Standard Value | ||||||
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Model Number | KSG10 | KSG12 | KSS14 | KSG16 | KSG20 | KSG25 | ||
Physical Properties | Thickness | μm | 10 | 12 | 14 | 16 | 20 | 25 |
Breathability | s/100ml | 180 | 200 | 250 | 280 | 260 | 350 | |
Puncture Strength | gf | 250 | 300 | 350 | 400 | 420 | 450 | |
Area Density | g/m² | 5.6 | 6.7 | 7.8 | 8.7 | 11.3 | 13.5 | |
Porosity | % | 38 | 38 | 38 | 40 | 38 | 40 | |
105℃/1h Thermal Shrinkage MD | % | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | |
105℃/1h Thermal Shrinkage TD | % | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | |
MD Tensile Strength | kgf/cm² | 1800 | 1800 | 2000 | 1800 | 1600 | 1800 | |
TD Tensile Strength | kgf/cm² | 160 | 160 | 160 | 160 | 160 | 160 |
Wet Separator
Classification | Features | Microstructure | |
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Wet Separator | Fin-shaped, High strength 4-12μm ⸺Low melting point material |
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7-meter wide separator production line, higher production efficiency |
Inspection Items | Unit | Standard Value | ||||||||
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Model Number | KWS05 High Strength |
KWS07 High Strength |
KWG09 General |
KWH09 High Porosity and Low Air Permeability |
KWG12 General |
KWG14 General |
KWG16 General |
KWG20 General |
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Physical Properties | Thickness | μm | 5 | 7 | 9 | 9 | 12 | 14 | 16 | 20 |
Breathability | s/100ml | 140 | 140 | 160 | 60 | 180 | 160 | 170 | 180 | |
Porosity | % | 35 | 37 | 39 | 50 | 40 | 42 | 43 | 44 | |
MD Tensile Strength | kgf/cm² | 3200 | 2800 | 2800 | 2000 | 2800 | 2500 | 2500 | 2200 | |
TD Tensile Strength | kgf/cm² | 3100 | 2800 | 2800 | 1700 | 2500 | 2200 | 2200 | 1900 | |
Area Density | g/m² | 3.1 | 4.2 | 5.2 | 4.3 | 6.8 | 7.7 | 8.7 | 10.6 | |
MD Elongation at Break | % | 85 | 95 | 105 | 98 | 110 | 115 | 115 | 120 | |
105℃/1h Thermal Shrinkage MD | % | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | |
105℃/1h Thermal Shrinkage TD | % | 1 | 1 | 1 | 0.5 | 1 | 1 | 1 | 1 |
Ceramic Coating Film
Category | Features | Microstructure | |
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Ceramic Coating | High Heat Resistance CCS Coating 150℃→180℃ Coating Thickness 2-3 μm" |
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Low Humidity CCS Coating 800ppm→<500ppm Coating Thickness 2-3 μm |
Product Category | Performance | Aluminum Oxide Coating | Bemite Coating | ||||
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General | Low Thermal Shrinkage | Resistance to Humidity and Heat | General | Low Thermal Shrinkage | Resistance to Humidity and Heat | ||
Single Side 2u Coating △ Breathability: ~20 seconds |
Humidity Moisture/ppm | 400-600 | 900-1300 | 600-800 | 300-500 | 800-1100 | 400-700 |
Thermal Shrinkage <3% at 130℃ for 1 hour | Y | Y | Y | Y | Y | Y | |
Thermal Shrinkage <5% at 150℃ for 1 hour | - | Y | - | - | Y | - | |
Single Side 3u Coating △ Breathability: ~30 seconds |
Humidity Moisture/ppm | 500-800 | 1200-1600 | 900-1100 | 350-550 | 1000-1400 | 500-800 |
130℃/1 hour Heat shrinkage <3% | Y | Y | Y | Y | Y | Y | |
150℃/1 hour Heat shrinkage <5% | - | Y | Y | - | Y | Y | |
Double-sided 2-3u coating △ Breathability: ~40 seconds |
Humidity Moisture/ppm | 600-900 | 1600-2200 | 1000-1400 | 400-600 | 1100-1600 | 600-1000 |
130℃/1 hour Heat shrinkage <3% | Y | Y | Y | Y | Y | Y | |
150℃/1 hour Heat shrinkage <5% | - | Y | Y | - | Y | Y |
Polymer coated film
Classification | Features | Microstructure | |
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Polymer coating | Water-based PVDF Low cost |
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Oil-based PVDF High adhesiveness Width speed upgrade Cost optimization |
Performance | Unit | Water-based Spray PVDF | Oil-based PVDF | ||||
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3+2+7+2+3 2-Ceramic 3-PVDF |
5+9+3+5 3-Ceramic 5-PVDF |
9+3+3 3-Ceramic 3-PVDF |
2+5+2 2-Mixed Coating |
2+7+2 2-Mixed Coating |
1+7+2+1 2-Ceramic 1-PVDF |
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Model Number | KWG07C22P33 | KWG09C03P55 | KWG09C03P03 | KWG05M22 | KWG07M22 | KWG07C02U11 | |
Thickness | μm | 175 (10 layers) | 220 (10 layers) | 150 (10 layers) | 8 | 10 | 11 |
Breathability | s/100ml | 220 | 200 | 200 | 140 | 160 | 170 |
Total Density | g/m² | 10.5 | 12 | 11 | 5.7 | 7.1 | 9.5 |
Adhesive Layer Density | g/m² | 1.2 | 1.6 | 0.6 | 2.6 | 2.6 | 1.4 |
Main Uses of Lithium Ion Battery Separator
In the structure of a lithium-ion battery, the separator is one of the internal components and plays a very important role. Lithium-ion batteries can be used in various fields such as electric vehicles, communications, energy storage, data centers, aerospace, electric ships, mobile power, smart homes, and power tools.