Heat shrinkage-resistant lithium-ion battery separator

A technology for lithium ion batteries and battery separators, which is applied in the field of battery separator preparation, can solve the problems of incomplete sealing of pore formers, different product quality and morphology, unfavorable new battery separators, etc., and achieves excellent mechanical strength, porosity and ventilation. The effect of high temperature and low thermal shrinkage

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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  • Heat shrinkage-resistant lithium-ion battery separator
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  • Heat shrinkage-resistant lithium-ion battery separator

Examples

Experimental program
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Effect test

Embodiment 1

[0144] The composition for preparing the heat-shrinkable lithium-ion battery separator 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 the nano-magnesium chloride is 50-70nm.

[0151] Prepare heat-shrinkable lithium-ion battery separators as follows:

[0152] 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

[0159] The composition for preparing the heat-shrinkable lithium-ion battery separator includes the following components by weight:

[0160]

[0161] in,

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

[0163] The number average molecular weight of UHMWPE is 1.3 million,

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

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

[0166] Prepare heat-shrinkable lithium-ion battery separators as follows:

[0167]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 o...

Embodiment 3

[0174] 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:

[0175]

[0176] in,

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

[0178] The number average molecular weight of UHMWPE is 1.4 million.

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Abstract

The invention discloses a heat shrinkage-resistant lithium-ion battery separator, which 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 heat shrinkage-resistant lithium-ion battery separator disclosed by the invention has excellent heat shrinkage resistance and good overall performance, has high puncture strength and tensile strength when reaching a relatively low thickness, can be applied to a relatively small battery and is not easily damaged in the installation process; a plurality of physical properties are taken into account; meanwhile, the heat shrinkage-resistant lithium-ion battery separator has good air permeability and porosity and small internal resistance; the capacity and the cycle performance of the battery are improved; and furthermore, the heat shrinkage-resistant lithium-ion battery separator also has relatively low closed pore temperature and membrane rupture temperature and high safety.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525H01M50/403H01M50/417H01M50/457H01M50/489H01M50/491H01M50/494
CPCH01M10/0525H01M2220/10H01M2220/20H01M2220/30H01M50/411Y02E60/10
Inventor 张汉鸿
Owner LIAOYUAN HONGTU LI ION BATTERY DIAPHRAGM TECH
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