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Preparation method for battery diaphragm with three kinds of microporous structures

A battery diaphragm and microporous structure technology, applied in the field of battery diaphragm preparation, can solve the problems of incomplete sealing of pore forming agents, easy flow out, and difficulty in controlling consistency

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 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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  • Preparation method for battery diaphragm with three kinds of microporous structures
  • Preparation method for battery diaphragm with three kinds of microporous structures
  • Preparation method for battery diaphragm with three kinds of microporous structures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0143] The composition used to prepare three kinds of microporous structure battery diaphragms comprises the following components by weight:

[0144]

[0145] in,

[0146] The number average molecular weight of high molecular polyethylene is 500,000,

[0147] The number average molecular weight of UHMWPE is 1.4 million,

[0148] The average molecular weight of white oil is 200,

[0149] The particle size of the nano-magnesium chloride is 50-70nm.

[0150] Three kinds of microporous structure battery separators were prepared according to the following methods:

[0151] Step 1), extrusion: mix high molecular weight polyethylene and magnesium chloride nanoparticles uniformly, and mix ultra high molecular weight polyethylene, 4,4-thiobis(6-tert-butyl m-cresol), 2,4-dihydroxy Benzophenone, sodium stearyl quaternary ammonium and Tween 80 are mixed evenly, and the above two mixtures are respectively put into the extruder to be heated and melted through two polyethylene composi...

Embodiment 2

[0158] The composition used to prepare three kinds of microporous structure battery diaphragms comprises the following components by weight:

[0159]

[0160] in,

[0161] The number average molecular weight of high molecular weight polyethylene is 300,000,

[0162] The number average molecular weight of UHMWPE is 1.3 million,

[0163] The average molecular weight of white oil is 180,

[0164] The particle size of the nano-magnesium chloride is 60-90nm.

[0165] Three kinds of microporous structure battery separators were prepared according to the following methods:

[0166] Step 1), extrusion: mix high molecular polyethylene and magnesium chloride nanoparticles evenly, and ultra high molecular polyethylene, 3,5-di-tert-butyl-4-hydroxytoluene, 4-benzoyloxy-2, 2,6,6-Tetramethylpiperidine, octadecyl quaternary ammonium sodium and lauric acid are mixed evenly, and the above two mixtures are respectively fed into the extruder from two polyethylene composition feed ports to ...

Embodiment 3

[0173] 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:

[0174]

[0175] in,

[0176] The number average molecular weight of high molecular polyethylene is 400,000,

[0177] The number average molecular weight of UHMWPE is 1.4 million.

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Abstract

The invention discloses a preparation method for a battery diaphragm with three kinds of microporous structures. The preparation method comprises the steps of performing fusing and mixing on a polyethylene composition, a pore-forming agent and an optional additive; extruding a cast film, and casting a thick sheet through a first sheet-casting roller and a second sheet-casting roller; next, performing longitudinal stretching through a preheating roller, a stretching roller, and a cooling roller; performing transverse stretching for the first time by passing through a first preheating region, a first stretching region and a first cooling region; performing extracting and pore-forming, and drying; and performing transverse stretching for the second time by passing through a second preheating region, a second stretching region and a second cooling region to obtain the battery diaphragm with the three kinds of microporous structures. The preparation method for the battery diaphragm with the three kinds of microporous structures is simple and convenient to operate, high in controllability and wide in application; and the battery diaphragm prepared by the method is good in comprehensive performance.

Description

technical field [0001] The invention relates to a preparation process of a battery separator, in particular to a preparation method of three kinds of microporous structure battery separators. 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. And the short circuit allows the electrolyte ions to pass through at the same time, thereby generating current. The current battery separator is mostly a polyethylene composition film with a microporous structure, and its 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 and other characteristics, a battery separator with excellent performance plays an important role in improving the overall performance of the b...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/0525H01M50/403
CPCH01M10/0525H01M2220/10H01M2220/20H01M2220/30H01M50/411Y02E60/10
Inventor 张汉鸿
Owner LIAOYUAN HONGTU LI ION BATTERY DIAPHRAGM TECH
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