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 st

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Example 1

[0032] The polypropylene porous diaphragm of the lithium ion battery in this embodiment is composed of the following quality components: 2,2'-methylene-bis(4,6-di-tert-butylphenol) sodium phosphate 1.5g, sodium benzoate 0.5g, 2.0kg of polypropylene resin. Among them, 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 membrane includes 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) Extruding the melt from the die, cooling it on a cooling roll and casting it into a thick sheet with a cooling temperature of 90°C;

[0036] 3) Take the thick sheet at 135°C and stretch it successively at 2 times in the longitudinal direction and 2 times in the transverse direction to mak...

Example Embodiment

[0038] Example 2

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

[0040] The preparation method of polypropylene porous membrane includes 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 it to 210°C to obtain a melt;

[0042] 2) Extruding the melt from the die, cooling and casting it into a thick sheet on a cooling roll, the cooling temperature is 100°C;

[0043] 3) Take the thick film at 135°C and stretch it successively at 3 times in the longitudinal direction and 2 times in the trans...

Example Embodiment

[0045] Example 3

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

[0047] The preparation method of polypropylene porous membrane includes the following steps:

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

[0049] 2) Extruding the melt from the die, cooling and casting it into a thick sheet on a cooling roll, the cooling temperature is 110°C;

[0050] 3) Take the thick film at 140℃ and stretch it successively at 3 times in the longitudinal direction and 2.5 times in the transverse direction to make a ...

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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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