Preparation method of low-closed-pore-temperature diaphragm, prepared low-closed-pore-temperature diaphragm and application of low-closed-pore-temperature diaphragm

A closed-cell temperature and diaphragm technology, which is applied in the preparation of low-closed-cell temperature diaphragms and in the field of low-closed-cell temperature diaphragms, can solve problems such as damage, loss, and abnormal parts, and achieve the effect of reducing the closed-cell temperature and protecting safety

Pending Publication Date: 2020-10-16
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the closed cell temperature of the polyethylene diaphragm is about 130°C-140°C, and the normal operating temperature of the lithium-ion battery is 0-60°C. When the temperature is out of control and reaches 130-140°C, other parts will be abnormal or damaged, causing certain loss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method of a low-closing temperature diaphragm, comprising the following steps:

[0030] Step 1: Mix polyethylene, paraffin oil, 2,6-di-tert-butyl-4-methylphenol and polyethylene wax in proportion to obtain a mixture;

[0031] Wherein, in the mixture, the mass fraction of polyethylene is 30 parts, the mass fraction of paraffin oil is 68.5 parts, the mass fraction of antioxidant is 0.5 part, and the mass fraction of polyethylene wax is 1 part.

[0032] The molecular weight of the polyethylene wax is 2000-3000 (manufacturer: Shanghai Jinshan Xingxing Plastic Co., Ltd., name: WE-2, appearance: white sheet, softening point 100°C-102.9°C)

[0033] The weight average molecular weight of the polyethylene is 300,000 (manufacturer: Mitsui Chemicals, model: 028S).

[0034] Step 2: Pass the mixture obtained in Step 1 through a twin-screw extruder at a temperature of 130°C to obtain a high-temperature melt;

[0035] Step 3: The obtained high-temperature melt is accur...

Embodiment 2

[0052] A preparation method of a low-closing temperature diaphragm, comprising the following steps:

[0053] Step 1: Mix polyethylene, paraffin oil, pentaerythritol-tetrakis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl) acrylate] and polyethylene wax in proportion to obtain a mixture;

[0054]Wherein, in the mixture, the mass fraction of polyethylene is 20 parts, the mass fraction of paraffin oil is 76 mass fractions, the mass fraction of antioxidant is 1 mass fraction, and the mass fraction of polyethylene wax is 3 mass fractions.

[0055] The molecular weight of the polyethylene wax is 3000-5000 (manufacturer: Shanghai Jinshan Xingxing Plastic Co., Ltd., name: WE-3, appearance: white sheet, softening point 103°C-105.9°C);

[0056] The weight average molecular weight of the polyethylene is 1.5 million (manufacturer: Mitsui Chemicals).

[0057] Step 2: Pass the mixture obtained in Step 1 through a twin-screw extruder at a temperature of 135° C. to obtain a high-temperature melt;

...

Embodiment 3

[0075] A preparation method of a low-closing temperature diaphragm, comprising the following steps:

[0076] Step 1: Mix polyethylene, paraffin oil, octadecane-3-(3,5-di-tert-butyl-4-hydroxyphenyl) acrylate and polyethylene wax in proportion to obtain a mixture;

[0077] Wherein, in the mixture, the mass fraction of polyethylene is 20 parts, the mass fraction of paraffin oil is 74 mass fractions, the mass fraction of antioxidant is 1 mass fraction, and the mass fraction of polyethylene wax is 5 mass fractions.

[0078] The molecular weight of the polyethylene wax is 5000-10000 (manufacturer: Shanghai Jinshan Xingxing Plastic Co., Ltd., name: WE-N, appearance: white flake, softening point 106°C-110°C).

[0079] The weight average molecular weight of the polyethylene is 1.5 million (manufacturer: Mitsui Chemicals).

[0080] Step 2: Pass the mixture obtained in Step 1 through a twin-screw extruder at a temperature of 140°C to obtain a high-temperature melt;

[0081] Step 3: The...

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Abstract

The invention discloses a preparation method of a low-closed-pore-temperature diaphragm. The preparation method comprises the following steps of 1, mixing polyethylene, paraffin oil, an antioxidant and polyethylene wax in proportion to obtain a mixture, 2, conducting heating to 130-140 DEG C to obtain a melt, 3, preparing the obtained melt into a casting piece, 4, stretching the obtained casting piece, and extracting to form a microporous membrane, and 5, carrying out high-temperature heat setting on the obtained microporous membrane to obtain the low-closed-pore-temperature diaphragm. According to the preparation method, the polyethylene wax is added into the polyethylene, the paraffin oil and the antioxidant, and the characteristic of low melting point of the polyethylene wax is utilized, so that the hole closing temperature of the diaphragm is reduced on the premise of not influencing the basic functions of the diaphragm, and the safety of the lithium ion battery and surrounding parts is better protected.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery diaphragm production, in particular to a preparation method of a low-closing temperature diaphragm, the prepared low-closing temperature diaphragm and an application thereof. Background technique [0002] Lithium-ion batteries are widely used in the fields of electronic communication, energy storage and power supply, and are mainly composed of positive electrode, negative electrode, electrolyte and battery separator. Among them, the battery separator is non-conductive and is located between the positive and negative electrodes to prevent the short circuit between the positive and negative electrodes due to contact, while allowing the electrolyte ions to pass through to generate current. [0003] Most of the current battery separators are polyolefin films with microporous structure, and their performance determines the interface structure and internal resistance of the battery, which di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525B29D7/01
CPCH01M10/0525B29D7/01Y02E60/10
Inventor 袁海朝徐锋候丹丹马文献
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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