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Photo-initiation cross-linked polymer isolating membrane and preparation method thereof

A technology of cross-linked polymer and isolation film, applied in electrical components, circuits, battery pack parts, etc., can solve the problems of small difference between film breaking temperature and closed-cell temperature, and high cost of isolation film coating process, and achieve improved Reliability and safety, excellent battery performance, difference between film breaking temperature and closed cell temperature, and effect of thermal shrinkage improvement

Active Publication Date: 2018-06-22
SUZHOU GREEN POWER NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a photo-initiated cross-linked polymer separator and its preparation method, which is used to solve the difference between the rupture temperature and the closed cell temperature of the battery separator in the prior art. The value is small, and the cost of the isolation film coating process is relatively high.

Method used

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  • Photo-initiation cross-linked polymer isolating membrane and preparation method thereof
  • Photo-initiation cross-linked polymer isolating membrane and preparation method thereof
  • Photo-initiation cross-linked polymer isolating membrane and preparation method thereof

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preparation example Construction

[0045] Such as figure 1 As shown, the present invention also provides a method for preparing a light-initiated crosslinked polymer isolation film. Using the preparation method, the above-mentioned isolation film can be prepared, and the preparation method at least includes:

[0046] S1, mix at least one high molecular weight polyethylene, pore forming agent, antioxidant, co-crosslinking agent and photoinitiator, and stir to form a mixture, wherein the average molecular weight of the high molecular weight polyethylene is between 10.0×10 4 ~1000×10 4 Between and the density is between 0.940~0.976g / cm 3 between;

[0047] S2, adopting a twin-screw extrusion process, dissolving the high molecular weight polyethylene, antioxidant, co-crosslinking agent and photoinitiator in the pore-forming agent at a certain temperature, and then extruding;

[0048] S3, casting the mixture extruded in the step S2 into a strip;

[0049] S4, extracting and removing the pore-forming agent in the s...

Embodiment 1

[0081] The density of 100 grams is 0.957g / cm 3 The average molecular weight is 5.0×10 5 High molecular weight polyethylene, 0.5 gram of antioxidant β-(3,5-di-tert-butyl-4-hydroxyphenyl) n-octadecanoate propionate, 0.5 gram of photoinitiator benzophenone, 0.5 gram of auxiliary crosslinking Triallyl isocyanurate, 300 grams 40 ℃ kinematic viscosity is 50mm 2 / s mineral oil (that is, pore-forming agent) is added to the continuous batching kettle, stirred at a speed of 50 rpm, and the raw materials are mixed evenly.

[0082] The mixture is continuously added to the twin-screw extruder, and at 180° C., the high molecular weight polyethylene, antioxidant, photoinitiator and auxiliary crosslinking agent are continuously dissolved in mineral oil in the twin-screw extruder, and then The twin-screw extruder continuously extrudes at a speed of 200 rpm, and the mixture continuously enters the slit die, and the mixture is extruded through the slit die to the casting cooling roll, and cast...

Embodiment 2

[0088] The density of 100 grams is 0.957g / cm 3 The average molecular weight is 5.0×10 5 High molecular weight polyethylene, 0.5 grams of antioxidant β-(3,5-di-tert-butyl-4-hydroxyphenyl) n-octadecanoate propionate, 1.0 grams of photoinitiator benzophenone, 0.5 grams of crosslinking aid Triallyl isocyanurate, 300 grams 40 ℃ kinematic viscosity is 50mm 2 / s mineral oil is added to the continuous batching and feeding kettle, and stirred at a speed of 50 rpm to mix the raw materials evenly.

[0089] The mixture is continuously added to the twin-screw extruder, and at 180° C., the high molecular weight polyethylene, antioxidant, photoinitiator and auxiliary crosslinking agent are continuously dissolved in mineral oil in the twin-screw extruder, and then The twin-screw extruder continuously extrudes at a speed of 200 rpm, and the mixture continuously enters the slit die, and the mixture is extruded through the slit die to the casting cooling roll, and cast into strips at 80°C . ...

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Abstract

The invention provides a photo-initiation cross-linked polymer isolating membrane and a preparation method thereof. The isolating membrane comprises high molecular weight polyethylene, an antioxidant,an assistant crosslinker and a photoinitiator which are crosslinked polymerized, wherein the average molecular weight of the high molecular weight polyethylene is 10.0X10<4> to 1000X10<4>, and the density is 0.940 to 0.976g / cm<3>; by taking the weight of the high molecular weight polyethylene as 100 parts, the weight of the antioxidant is 0.1 to 10, the weight of the assistant crosslinker is 0.1to 10, and the weight of the photoinitiator is 0.1 to 10; the photo-initiation cross-linked polymer isolating membrane is formed in a photo-initiation cross-linked manner. The thickness of the isolating membrane is 5 to 30 micrometers, a micropore diameter is 0.01 to 0.1 micrometer, the porosity is 30 to 60 percent, the difference of obturator temperature and membrane rupture temperature is 30 to60 DEG C, and the minimum hot-shrinkage rate is 0.5 percent, so that compared with the prior art, the photo-initiation cross-linked polymer isolating membrane has the advantages that the difference ofobturator temperature and membrane rupture temperature and the hot-shrinkage rate are obviously increased, moreover, the photo-initiation cross-linked polymer isolating membrane has good strength, average pore diameter and pore diameter distribution.

Description

technical field [0001] The invention relates to the field of battery isolation films, in particular to a photoinitiated crosslinked polymer isolation film and a preparation method thereof. Background technique [0002] Lithium-ion batteries are usually mainly composed of positive electrodes, negative electrodes, separators, electrolytes, and battery casings. In the lithium-ion battery structure, the separator is one of the key inner components. The main function of the diaphragm is to separate the positive and negative electrodes of the battery, prevent the positive and negative electrodes from being directly contacted and short circuit, and at the same time enable the electrolyte ions to pass smoothly during the charging and discharging process of the battery, forming a current, and abnormality occurs when the battery operating temperature When it rises, the migration channel of electrolyte ions is closed, and the current is cut off to ensure the safety of the battery. It...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08F255/02C08L23/06C08K5/134H01M2/16H01M2/14H01M50/403H01M50/406H01M50/411H01M50/414H01M50/417H01M50/489H01M50/491H01M50/494
CPCC08F255/02C08J5/18C08K5/1345C08J2323/06H01M50/494H01M50/414H01M50/491H01M50/406H01M50/489C08J9/0023C08J9/0028C08J9/283Y02E60/10
Inventor 程跃熊磊
Owner SUZHOU GREEN POWER NEW ENERGY MATERIALS CO LTD
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