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Three kinds of microporous structure battery separator

A technology of battery separator and microporous structure, applied in the direction of structural parts, battery pack parts, separators/films/diaphragms/spacers, etc. New battery separators and other issues, to achieve the effects of excellent mechanical strength, low closed cell temperature, and low thermal shrinkage

Active Publication Date: 2019-08-27
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 equipment is smooth, and the surface of the manufactured diaphragm is smooth, and the adhesion ability with other substances Poor, which is not conducive to the development of new battery separators; 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

Method used

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  • Three kinds of microporous structure battery separator
  • Three kinds of microporous structure battery separator
  • Three kinds of microporous structure battery separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0144] The composition for preparing three kinds of microporous structure battery separators includes the following components by weight:

[0145]

[0146] in,

[0147] The number average molecular weight of high molecular polyethylene is 500,000,

[0148] The number average molecular weight of UHMWPE is 1.4 million,

[0149] The average molecular weight of white oil is 200,

[0150] The particle size of nano-magnesium chloride is 50-70 nm.

[0151] Three kinds of microporous structure battery separators were prepared according to the following methods:

[0152] Step 1), extrusion: mix the high molecular polyethylene and magnesium chloride nanoparticles uniformly, and mix the ultra high molecular polyethylene, 4,4-thiobis(6-tert-butyl-m-cresol), 2,4-dihydroxyl Benzophenone, sodium octadecyl quaternary ammonium and Tween 80 are mixed uniformly, the above two mixtures are respectively put into the extruder from two polyethylene composition feed ports and heated and melted...

Embodiment 2

[0159] The composition for preparing three kinds of microporous structure battery separators includes the following components by weight:

[0160]

[0161] in,

[0162] The number average molecular weight of high molecular polyethylene is 300,000,

[0163] The number-average molecular weight of ultra-high molecular weight polyethylene is 1.3 million,

[0164] The average molecular weight of white oil is 180,

[0165] The particle size of the nano-magnesium chloride is 60-90 nm.

[0166] Three microporous structured battery separators were prepared as follows:

[0167] Step 1), extrusion: mix the high molecular polyethylene and magnesium chloride nanoparticles uniformly, and mix the 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 were mixed uniformly, and the above two mixtures were respectively put into the extruder from the two polyethylene compositi...

Embodiment 3

[0174] The method used in this example is similar to the method used in Example 2, the only difference being that the compositions used to prepare three kinds of microporous structure battery separators include the following components by weight:

[0175]

[0176] in,

[0177] The number average molecular weight of high molecular polyethylene is 400,000,

[0178] The number average molecular weight of the ultra-high molecular weight polyethylene is 1.4 million.

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Abstract

The invention discloses a battery separator with three micropore structures. The separator comprises a first outer layer, a second outer layer and an inner layer clamped between the first outer layer and the second outer layer, wherein the first outer layer, the second outer layer and the inner layer have different micropore structures. The battery separator with the three micropore structures disclosed by the invention has a plurality of physical and chemical properties and good overall performance, has high puncture strength and tensile strength when reaching a relatively small thickness, can be used for a relatively small battery, and is not easily damaged in the installation process and has good air permeability and porosity and small internal resistance; the capacity and the cycle performance of the battery are improved; and furthermore, the battery separator also has relatively low closed pore temperature and membrane rupture temperature and high safety.

Description

Technical field [0001] The present invention relates to a preparation process of battery separators, specifically to three types of microporous structure battery separators and their preparation methods. Background technique [0002] Lithium-ion batteries are widely used in fields such as electronic communications, energy storage, and power supplies. They are mainly composed of a positive electrode, a negative electrode, an electrolyte, and a battery separator. The battery separator is non-conductive and is located between the positive electrode and the negative electrode to prevent contact between the two. A short circuit also allows electrolyte ions to pass through, thereby generating current. Current battery separators are mostly polyethylene composition films with microporous structures. Their performance determines the interface structure and internal resistance of the battery, which directly affects the capacity and cycle of the battery. As well as safety performance a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M2/18H01M2/14
CPCH01M50/403H01M50/411H01M50/463Y02E60/10
Inventor 张汉鸿
Owner LIAOYUAN HONGTU LI ION BATTERY DIAPHRAGM TECH