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A kind of porous separator film for lithium ion battery and preparation method thereof

A lithium-ion battery and separator technology, which is used in secondary batteries, battery pack components, and secondary battery repair/maintenance, etc. Heat resistance and mechanical strength, the effect of simple process

Active Publication Date: 2019-11-08
JIANGXI DIBIKE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the polyolefin microporous membranes currently used in commercial lithium-ion battery separators, the closed-cell temperature of polyethylene microporous membranes is 130 ° C to 140 ° C, but its melting rupture temperature is also very low, and the safety is not high enough.

Method used

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  • A kind of porous separator film for lithium ion battery and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] A porous separator for a lithium-ion battery, comprising a main layer with a pore structure, and heat-resistant layers arranged on both sides of the main layer;

[0026] The main layer includes the following substances in parts by weight: the molecular weight is 1×10 5 100 parts by weight of high-density polyethylene with a molecular weight of 1.5×10 5 7 parts by weight of low-density polyethylene, 1.5 parts by weight of polyethylene terephthalate;

[0027] The heat-resistant layer includes the following substances in parts by weight: the molecular weight is 1×10 6 100 parts by weight of polypropylene with a molecular weight of 2×10 6 8 parts by weight of polyethylene, 2.5 parts by weight of glass powder; the particle size of the glass powder is 0.5 μm.

[0028] The raw materials of the above-mentioned main layer and heat-resistant layer are weighed according to the formula, and after being dried and mixed by the extruder, they are respectively melted and mixed to fo...

Embodiment 2

[0030] In this embodiment, the heat-resistant layer is only provided on one side of the main layer in Embodiment 1, and the rest remain unchanged.

Embodiment 3

[0032] A porous separator for a lithium-ion battery, comprising a main layer with a pore structure, and heat-resistant layers arranged on both sides of the main layer;

[0033] The main layer includes the following substances in parts by weight: the molecular weight is 5×10 4 100 parts by weight of high-density polyethylene, molecular weight of 1.2 × 10 5 4 parts by weight of low-density polyethylene, 1 part by weight of polyethylene terephthalate;

[0034] The heat-resistant layer includes the following substances in parts by weight: the molecular weight is 1.2×10 6 100 parts by weight of polypropylene with a molecular weight of 3×10 6 5 parts by weight of polyethylene, TiO 2 1.5 parts by weight of particles; the TiO 2 The particle size of the particles was 0.2 μm.

[0035] The raw materials of the above-mentioned main layer and heat-resistant layer are weighed according to the formula, and after being dried and mixed by the extruder, they are respectively melted and mixed...

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Abstract

The present invention relates to the technical field of lithium-ion batteries, in particular to a porous separator for lithium-ion batteries and a preparation method thereof, wherein the porous separator includes a main layer; Layer; with the weight of high-density polyethylene as 100, the main layer includes: 100 parts by weight of high-density polyethylene, 2-10 parts by weight of low-density polyethylene, 0.5-2 parts by weight of polyester chips; The weight is 100, and the heat-resistant layer includes: 100 parts by weight of polypropylene, 3-12 parts of ultra-high molecular weight polyethylene, and 1-5 parts of inorganic filler particles; in the porous isolation membrane provided by the invention, the main layer is used In order to realize the automatic shutdown protection function, the heat-resistant layer ensures the melting temperature of the porous separator, preventing the battery from being melted and ruptured by excessive temperature and causing a battery short circuit. The difference between the closed cell temperature and the melting temperature of the porous separator is large, ensuring battery safety.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a porous separator for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been developed rapidly due to their excellent electrical properties such as high energy density, long cycle life and high voltage. At present, it has been widely used in the fields of electronic products such as mobile phones, portable computers, cameras, and video cameras, and the application fields are still expanding. [0003] Lithium-ion batteries consist of positive and negative electrodes, electrolytes and separators. Among them, an important function of the separator is to isolate the positive and negative electrodes and prevent the passage of electrons in the battery, while allowing the passage of ions, thereby completing the rapid transmission of lithium ions between the positive and negative electrodes during electrochemi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M10/42H01M50/403H01M50/449H01M50/489
CPCH01M10/0525H01M10/4235H01M50/446H01M50/403H01M50/449H01M50/411Y02E60/10
Inventor 韦梦梅汪涛
Owner JIANGXI DIBIKE
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