Lithium ion battery diaphragm with three kinds of microporous structures, and polyethylene composition adopted by same

A lithium-ion battery and microporous structure technology, applied in the field of polyolefin compositions, can solve the problems of different product quality and appearance, uneven distribution of micropores, poor adhesion, etc.

Active Publication Date: 2017-01-11
LIAOYUAN HONGTU LI ION BATTERY DIAPHRAGM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are some defects in the traditional battery separator wet preparation process, including: in the casting process, a casting roll with cooling function is usually used for single-sided cooling, and the pore-forming agent is not completely sealed and easy to flow out, resulting in uneven distribution of micropores ;The extrusion equipment in different production steps is different, resulting in different product quality and appearance, and it is difficult to control the consistency; usually the surface of the extrusion equipment and stretching tension equipment is smooth, and the surface of the manufactured diaphragm is smooth, and the adhesion with other substances The ability is poor, which is not conducive to the development of new battery separators; the drying equipment after extraction usually uses two methods of water gun and air gun at the same time, resulting in water marks on the surface of the separator, and the flatness is not good enough
[0006] At present, in the prior art, there is a method of laminating multilayer polyolefin films to make multilayer composite lithium ion battery separators. Not only is the operation complicated, the product quality is unstable, and the equipment used often requires special design.

Method used

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  • Lithium ion battery diaphragm with three kinds of microporous structures, and polyethylene composition adopted by same
  • Lithium ion battery diaphragm with three kinds of microporous structures, and polyethylene composition adopted by same
  • Lithium ion battery diaphragm with three kinds of microporous structures, and polyethylene composition adopted by same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0232] The polyethylene composition used to prepare the lithium-ion battery separator with three kinds of microporous structures comprises the following components by weight:

[0233]

[0234] in,

[0235] The number average molecular weight of high molecular polyethylene is 500,000,

[0236] The number average molecular weight of UHMWPE is 1.4 million,

[0237] The average molecular weight of white oil is 200,

[0238] The particle size of the nano-magnesium chloride is 50-70nm.

[0239] Above-mentioned composition is made lithium-ion battery diaphragm according to the following method:

[0240] Step 1), extrusion: melt and mix high molecular polyethylene and nano-magnesium chloride, add ultra high molecular polyethylene, 4,4-thiobis(6-tert-butyl meta cresol), 2,4-dihydroxybenzophenone, sodium octadecyl quaternary ammonium and Tween 80 are added to the extruder by the second feed port, white oil is fed by the first pore-forming agent feed port and The second pore-form...

Embodiment 2

[0247] The composition for preparing lithium-ion battery diaphragm comprises the following components by weight:

[0248]

[0249] in,

[0250] The number average molecular weight of high molecular weight polyethylene is 300,000.

[0251] The number average molecular weight of UHMWPE is 1.3 million.

[0252] The average molecular weight of white oil is 180;

[0253] The particle size of the nano-magnesium chloride is 60-90nm.

[0254] The above-mentioned composition is prepared lithium-ion battery diaphragm according to the following method:

[0255] Step 1), extrusion: melt and mix high molecular polyethylene and nano-magnesium chloride, add ultra high molecular polyethylene, 3,5-di-tert-butyl-4-hydroxytoluene, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, sodium octadecyl quaternary ammonium and lauric acid are fed into the extruder from the second feed port, white oil is fed from the first The feed port of the pore agent and the feed port of the second pore forming ag...

Embodiment 3

[0262] The method used in this embodiment is similar to the method used in Example 2, except that the polyethylene composition comprises the following components by weight:

[0263]

[0264] in,

[0265] The number average molecular weight of high molecular weight polyethylene is 400,000.

[0266] The number average molecular weight of UHMWPE is 1.4 million.

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PUM

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Abstract

The invention discloses a lithium ion battery diaphragm with three kinds of microporous structures, and a polyethylene composition adopted by the same. The composition comprises high-molecular polyethylene, ultra-high-molecular polyethylene and an optional additive. The lithium ion battery diaphragm prepared from the composition has integrally-formed three kinds of microporous structures; and in addition, the lithium ion battery diaphragm has relatively low closed-hole temperature, high heat resistance shrinkage, high tensile strength, high puncture strength and relatively high membrane-rupture temperature, thereby ensuring safety in preparation and usage of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium-ion battery separators, in particular to a lithium-ion battery separator with three microporous structures and a polyolefin (especially polyethylene) composition used. Background technique [0002] Lithium-ion batteries are widely used in the fields of electronic communication, energy storage, and power supply. They are mainly composed of positive electrodes, negative electrodes, electrolytes, and battery separators. Among them, the battery separator is non-conductive and is located between the positive and negative electrodes to prevent positive and negative electrodes. The latter is short-circuited due to contact, and at the same time allows the electrolyte ions to pass through, thereby generating current. The current battery separator is mostly a polyolefin film with a microporous structure, and its performance determines the interface structure and internal resistance of the battery, which directly affec...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/417
CPCH01M10/0525H01M50/40H01M50/409Y02E60/10
Inventor 张汉鸿
Owner LIAOYUAN HONGTU LI ION BATTERY DIAPHRAGM TECH
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