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Lithium-ion battery membrane

2016-06-12

Lithium-ion battery membrane is one of the three important components of lithium battery. Our annual output of dry process Biaxially Oriented Lithium-ion battery membrane is 40 million square meters.  

The dry process of Biaxially Oriented Lithium-ion battery membrane is on the basis of the developed technology of institute of chemistry of Chinese academy of Sciences with independent intellectual property rights.

The formation of microporosity crystal shape changes is using PP density differences between different  phase during stretching process through adding β type crystal form ameliorant with nucleation effect in PP.

 

Product characteristics:

   Uniform pore size distribution

   High porosity and permeability

   Excellent chemical and electro chemical stability

   Excellent absorbing moisturizing ability

   Excellent thermal stability and automatic shutoff protection performance

 

Product specification;

width

20-800mm

thickness

16-40μm

 

Storage condition:

The product should be stored in a ventilated, cool, and dry warehouse with the temperature of -5℃-35℃, away from heat source, is not subject to strong direct sunlight.

 

Technical Parameter:

Inspection item

Unit

Test method

 Product specification

Technical standard

Thickness

μm

   ISO

4591-1992

All specification

± 2

Air permeability

Sec/100ML

Company standard

 

16μm

200±30

20μm

250±30

25μm

300±30

32μm

400±30

40μm

500±30

Porosity

%

Company standard

 

All specification

35-50

Absorption

%

Company standard

(Lithium)

 

16μm

>140%

20μm

>140%

25μm

>140%

32μm

>140%

40μm

>140%

Surface density

G/m2

Company standard

 

16μm

8±1

20μm

10.5±1

25μm

13±1

32μm

16±2

40μm

19.5±2

 Thermal shrinkage

 Constant temperature drying oven

 

 

 

   %

 

 

ASTMD

1204

 

 

All specification

120℃

60min

TD

≤2.5

MD

≤3

105℃

60min

TD

≤1

MD

≤2

Puncture

Strength

 

   g

 

Company standard

16μm

≥300

20μm

≥350

25μm

≥400

32μm

≥450

40μm

≥500

Tensile strength

Mpa

 

 

GB/T 13022

All specification

TD

≥30

MD

≥100

Elongation

at break

%

All specification

TD

≥150

MD

≥40

Blister,

impurity point

Spots/m2

 

Company standard

All specification

≤10

Flatness

mm/m

All specification

≤1.5

End surface

mm

All specification

±0.5

Others

 

 

All specification

The surface is smooth, no spots,

no scratch, no folding, no stripe

no shading zone



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