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Porous isolating membrane for lithium ion battery and preparation method thereof

A lithium-ion battery and separator technology, which is used in secondary batteries, battery pack parts, and secondary battery repair/maintenance, etc., can solve the problems of insufficient safety, low melting rupture temperature, etc. The effect of improving melting point and ensuring safety

Active Publication Date: 2018-04-13
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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  • Porous isolating membrane for lithium ion battery and preparation method thereof

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Effect test

Embodiment 1

[0026] 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;

[0027] 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;

[0028] 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 ultra-high molecular weight polyethylene, 2.5 parts by weight of glass powder; the particle size of the glass powder is 0.5 μm.

[0029] 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 respect...

Embodiment 2

[0031] 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

[0033] 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;

[0034] 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;

[0035] 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 ultra-high molecular weight polyethylene, TiO 2 1.5 parts by weight of particles; the TiO 2 The particle size of the particles was 0.2 μm.

[0036] 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...

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Abstract

The invention relates to the technical field of lithium ion batteries, and specifically relates to a porous isolating membrane for a lithium ion battery and a preparation method thereof. The porous isolating membrane comprises a main layer and a heat resistant layer or heat resistant layers arranged on one side or two sides of the main layer, wherein in terms of 100 parts of high density polyethylene in parts by weight, the main layer comprises 100 parts of high density polyethylene, 2 to 10 parts of low density polyethylene and 0.5 to 2 parts of polyester chips; in terms of 100 parts of polypropylene in parts by weight, each heat resistant layer comprises 100 parts of polypropylene, 3 to 12 parts of ultra-high molecular weight polyethylene and 1 to 5 parts of inorganic filler particles. In the porous isolating membrane provided by the invention, the main layer is used for realizing an automatic turn-off protection function, the heat resistant layer guarantees the melting temperature of the porous isolating membrane, the fusion and fracture of the isolating membrane, caused by overhigh temperature, to cause battery short circuit are prevented, the difference value of the obturatortemperature and the melting temperature of the porous isolating membrane is large, and the safety of the battery is guaranteed.

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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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M10/42H01M50/403H01M50/449H01M50/489
CPCH01M10/0525H01M10/4235H01M50/446H01M50/403H01M50/449H01M50/411Y02E60/10
Inventor 汪涛
Owner JIANGXI DIBIKE
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