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Lithium Battery Separator Film

Battery separators are a permeable membrane placed between the anode and cathode of a battery in order to keep the two electrodes from touching, thus preventing an electrical short circuit while still allowing for movement of ionic charge carries needed for closing the circuit during the movement of the current in an electrochemical cell. Here at Ningbo Great Southeast Wanxiang Science and Technology Co.,Ltd., we offer lithium battery separator films with 3 ceramic coatings to choose from: alumina ceramics, composite ceramics and nano-ceramics in order to meet specific application needs.

Application:
DDN products are widely used as separator films of electric car batteries, energy storage batteries and batteries for 3C products and so on. The lithium battery separator films are primarily used in 3C products, including computer, communication, consumer electronics, and storage batter products.

1. 12μm plus 4μm alumina ceramics separator films (supporting 2μm ceramics coating)
Number Item Acceptance standard
1 Packaging sealing bags with vacuum packaged Internal diameter:76mm plastic rolling core
2 Thickness 16±1.5μm (average value:16±1.0μm)
3 coating thickness 4(or 2+2)±0.5um
4 Peel strength of coating >150N/m
5 Quality of coating Coating must be smooth, uniform, and have no defects.
6 areal density 13±3g/m2
7 air permeability 200±100 s/100cc
8 Puncture Strength ≥5N
9 tortuosity < 1.5mm/m
10 humidity ≤1500ppm
11 obturator temperature 125±10℃
12 fusion temperature >140℃
13 Porosity 45±5
14 Thermal Contraction Coefficient MD≤1%
TD≤1%
15 Tensile strength MD≥120Mpa
MD≥110Mpa
2. 12μm plus 4μm plus 1μm plus 1μm alumina ceramics separator films and PVDF separator films (supporting 2μmceramics coating)
Number Item Acceptance standard
1 Packaging sealing bags with vacuum packaged Internal diameter:76mm plastic rolling core
2 Thickness 18±1.5um(average value: 18±1.0um)
3 coating thickness 4(or 2+2)+1+1±0.5um
4 Peel strength of coating >150N/m
5 Quality of coating Coating must be smooth, uniform, and have no defects.
6 areal density 14±3 g/m2
7 air permeability 200±100 s/100cc
8 Puncture Strength ≥6N
9 tortuosity < 1.5mm/m
10 humidity ≤1000ppm
11 obturator temperature 125±10℃
12 fusion temperature >140℃
13 Porosity 45±5
14 Thermal Contraction Coefficient MD≤1%
TD≤1%
15 Tension strength MD≥160Mpa
MD≥150Mpa
Electron micrograph:
  • The electron micrograph of separator film with high porosity in the wet process
  • The electron micrograph of separator film with high porosity in the dry process
  • The electron micrograph of separator film with normal porosity in the dry process
  • The electron micrograph of separator film with normal porosity in the wet process

Product features:
The lithium battery separator film features a higher porosity, better air permeability and better safety levels than other battery separator films, thus meeting the requirements for large current discharges in power batteries.

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