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

Dry Separator

Classification Features Microstructure
Dry Separator High performance, tear resistance 10-25μm
⸺Multicomponent technology
Note: The above test data is for reference only, and can be customized according to special requirements.
Inspection Items Unit Standard Value
Model Number KSG12 KSG14 KSH14 KSG16 KSH16 KSG18 KSG20 KDG25
Physical Properties Thickness μm 12.6 14.4 14.4 16 16 18 20 25
Breathability s/100mL 220 230 125 280 260 305 325 305
Puncture Strength gf 240 250 240 300 250 320 340 400
Area Density g/m² 6.8 7.5 6.9 8.8 8.5 10.1 11 13.75
Porosity % 40 42 47 39 42 38 39 39
105℃/1h Thermal Shrinkage MD % 1.0 1.0 1.1 0.9 0.9 0.5 0.8 0.7
105℃/1h Thermal Shrinkage TD % 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
MD Tensile Strength 2000 1700 1800 1900 1750 1900 1800 1800
TD Tensile Strength kgf/cm² 160 170 130 150 165 170 155 160

Wet Separator

Classification Features Microstructure
Wet Separator Fin-shaped, High strength 4-12μm
⸺Low melting point material
7-meter wide separator production line, higher production efficiency
Note: The above test data is for reference only and can be customized to meet special requirements.
Inspection Items Unit Standard Value
Model Number KWD04
High Porosity and Hight Strength		 KWS05
Hight Strength		 KWS07
Hight Strength		 KWG09
General		 KWG12
General		 KWH12
High Porosity and Low Permeability		 KWG16
General		 KWH16
High Porosity
Physical Properties Thickness μm 4.5 5.3 7.1 9.2 12.1 12.2 16.5 16.1
Breathability s/100mL 68 118 160 166 185 89 223 174
Porosity % 37.3 31.5 37.1 38.6 39.2 49.5 40.8 44.5
MD Tensile Strength kgf/cm² 4349 5025 3311 2843 2334 2463 2065 1921
TD Tensile Strength kgf/cm² 4272 4935 3778 2925 2413 2118 2090 2210
Puncture Strength gf 412 603 545 573 642 608 785 716
Area Density g/m² 2.7 3.4 4.2 5.4 6.9 6.0 9.1 8.4
MD Elongation at Break % 59 68 116 112 99 102 110 123
TD Elongation at Break % 75 85 89 97 95 111 103 102
105℃/1h Thermal Shrinkage MD % 2.1 1.9 3.4 1.8 2.3 0.8 3.5 2.9
105℃/1h Thermal Shrinkage TD % 1.6 1.8 1.5 0.5 0.5 0.6 1.1 0.8

Ceramic Coating Film

Category Features Microstructure
Ceramic Coating High Heat Resistance CCS Coating 150℃→180℃
Coating Thickness 2-3 μm"
Low Humidity CCS Coating 800ppm→＜500ppm
Coating Thickness 2-3 μm
Note: The above test data is for reference only and can be customized to meet special requirements.
Product Category Performance Aluminum Oxide Coating Bemite Coating
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
Polymer coating Water-based PVDF
Low cost
Note: The above test data is for reference only and can be customized to fit specific requirements.
Performance Unit Water-based Spray PVDF
3+2+7+2+3
2-Ceramic
3-PVDF		 5+9+3+5
3-Ceramic
5-PVDF		 9+3+3
3-Ceramic
3-PVDF
Model Number KWG07C22P33 KWG09C03P55 KWG09C03P03
Thickness μm 175 (10 layers) 220 (10 layers) 150 (10 layers)
Breathability s/100ml 220 200 200
Total Density g/m² 10.5 12 11
Adhesive Layer Density g/m² 1.2 1.6 0.6

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.