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Polypropylene porous membrane for lithium-ion battery and preparation method of polypropylene porous membrane

A technology for lithium-ion batteries and porous diaphragms, which is applied to battery components, circuits, electrical components, etc., can solve the problems of weak puncture resistance and high porosity, and achieve uniform strength, strong tensile strength, and moderate size. Effect

Active Publication Date: 2016-06-01
HENAN NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The film has good uniformity, high permeability and strong dimensional stability, but its puncture resistance is weak and the porosity is too high

Method used

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  • Polypropylene porous membrane for lithium-ion battery and preparation method of polypropylene porous membrane

Examples

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Effect test

Embodiment 1

[0032] The lithium-ion battery polypropylene porous diaphragm in the present embodiment, raw material is made up of the component of following quality: 2,2'-methylene-di(4,6-di-tert-butylphenol) sodium phosphate 1.5g, sodium benzoate 0.5g, polypropylene resin 2.0kg. Among them, the polypropylene resin has a viscosity average molecular weight of 1.3×10 4 The isotactic resin has a melt index of 15g / 10min.

[0033] The preparation method of polypropylene porous diaphragm, comprises the following steps:

[0034] 1) Accurately take polypropylene resin, 2,2'-methylene-bis(4,6-di-tert-butylphenol) sodium phosphate and sodium benzoate according to the quality, and heat to 180°C to obtain a melt;

[0035] 2) The melt is extruded from the die, cooled and cast into a thick sheet on a cooling roll, and the cooling temperature is 90°C;

[0036] 3) Take the thick sheet and carry out successive stretching at 135°C to 2 times in the vertical direction and then 2 times in the transverse dir...

Embodiment 2

[0039]The lithium-ion battery polypropylene porous diaphragm in the present embodiment, raw material is made up of the component of following quality: 2,2'-methylene-di(4,6-di-tert-butylphenol) calcium hydrogen phosphate 15.0g, benzene Calcium formate 5.0g, polypropylene resin 2.0kg. Among them, the polypropylene resin has a viscosity average molecular weight of 3.0×10 4 A random resin with a melt index of 10g / 10min.

[0040] The preparation method of polypropylene porous diaphragm, comprises the following steps:

[0041] 1) Accurately take polypropylene resin, 2,2'-methylene-bis(4,6-di-tert-butylphenol) calcium hydrogen phosphate and calcium benzoate according to the quality, and heat to 210°C to obtain a melt;

[0042] 2) Extrude the melt from the die, cool it on a cooling roll and cast it into a thick sheet at a cooling temperature of 100°C;

[0043] 3) Take the thick sheet and stretch it at 135°C to 3 times in the vertical direction and then 2 times in the transverse di...

Embodiment 3

[0046] The lithium-ion battery polypropylene porous diaphragm in the present embodiment, raw material is made up of the component of following quality: Methylene bis (2,4-di-tert-butylphenoxy) aluminum phosphate 23.0g, magnesium benzoate 17.0g, Polypropylene resin 2.0kg. Among them, the polypropylene resin has a viscosity average molecular weight of 1.1×10 5 The syndiotactic resin has a melt index of 7.8g / 10min.

[0047] The preparation method of polypropylene porous diaphragm, comprises the following steps:

[0048] 1) Accurately take polypropylene resin, methylene bis(2,4-di-tert-butylphenoxy)aluminum phosphate and magnesium benzoate according to the quality, and heat to 210°C to obtain a melt;

[0049] 2) The melt is extruded from the die, cooled and cast into a thick sheet on a cooling roll, and the cooling temperature is 110°C;

[0050] 3) Take the thick sheet and carry out successive stretching at 140°C at a ratio of 3 times in the longitudinal direction and then 2.5 ...

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Abstract

The invention discloses a polypropylene porous membrane for a lithium-ion battery and a preparation method of the polypropylene porous membrane, and belongs to the technical field of membranes for lithium-ion batteries. The polypropylene porous membrane for the lithium-ion battery is prepared from the following components in percentage by mass: 0.075%-2.5% of a porous modifier, 0.025%-2.5% of an aperture regulator and the balance of polypropylene resin; the porous modifier is selected from any one or combination of two of organic phosphate and an amide nucleating agent; and the aperture regulator is selected from any one or combination of two of benzoate and alkyl carboxylate containing 3-6 carbons. In an in-situ compound manner, the porous modifier and the aperture regulator are added to polypropylene resin; a mixture is subjected to heat setting after melting and casting and two-way stretching to prepare the polypropylene porous membrane; the mean pore sizes of pores of the membrane are 60-300nm; the polypropylene porous membrane is moderate in size, high in puncture strength and good in air permeability; the porosity of the membrane is 35%-50%; and the air permeability is 200-400s / 100mL.

Description

technical field [0001] The invention relates to a lithium battery diaphragm, in particular to a polypropylene porous diaphragm for a lithium ion battery and a preparation method for the polypropylene porous diaphragm, and belongs to the technical field of lithium ion battery diaphragms. Background technique [0002] In the lithium battery structure, the separator is one of the key inner components. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A separator with excellent performance plays an important role in improving the overall performance of the battery. [0003] Looking at the performance requirements from the function, lithium battery separators generally need to meet the following requirements: (1) isolation requirements: have electronic insulation to ensure effective isolation of positive and negative electrodes; (2) porosity ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/411H01M50/489
CPCH01M50/403H01M50/411Y02E60/10
Inventor 杨书廷谷继峰曹相杰董红玉尹艳红褚鹏杰
Owner HENAN NORMAL UNIV
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