Preparation method of heat shrinkage-resistant lithium-ion battery separator

A lithium-ion battery, heat-resistant technology, applied in the field of preparation of lithium-ion battery separators, can solve problems such as insufficient flatness, incomplete sealing of pore-forming agents, and different product quality and morphology.

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 cont

Method used

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  • Preparation method of heat shrinkage-resistant lithium-ion battery separator
  • Preparation method of heat shrinkage-resistant lithium-ion battery separator
  • Preparation method of heat shrinkage-resistant lithium-ion battery separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0143] The composition for preparing the heat-shrinkable lithium-ion battery separator includes 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] Prepare heat-shrinkable lithium-ion battery separators as follows:

[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 composition feed ports, and two Put white oil into the...

Embodiment 2

[0158] The composition for preparing the heat-shrinkable lithium-ion battery separator includes 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] Prepare heat-shrinkable lithium-ion battery separators as follows:

[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 be heated and melted, and then extruded On the ...

Embodiment 3

[0173] The method used in this example is similar to the method used in Example 2, the only difference being that the composition used to prepare the heat-shrinkable lithium-ion battery separator includes 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 of a heat shrinkage-resistant lithium-ion battery separator. The method comprises the steps of melting and mixing 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; and carrying out longitudinal stretching through a preheating roller, a stretching roller and a cooling roller, carrying out first transverse stretching through a first preheating zone, a first stretching zone and a first cooling zone, carrying out extracting, pore-forming and drying and then carrying out second transverse stretching through a second preheating zone, a second stretching zone and a second cooling zone to obtain the heat shrinkage-resistant lithium-ion battery separator. The preparation method of the heat shrinkage-resistant lithium-ion battery separator is simple and convenient to operate, high in controllability and wide in application; and the battery separator prepared by the method has excellent heat shrinkage resistance and good overall performance.

Description

technical field [0001] The invention relates to a preparation process of a battery diaphragm, in particular to a preparation method of a heat-shrinkable lithium-ion battery diaphragm. 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 battery. ...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M50/403
CPCH01M50/403Y02E60/10
Inventor 张汉鸿
Owner LIAOYUAN HONGTU LI ION BATTERY DIAPHRAGM TECH
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