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Silane crosslinked polymer separation film and preparation method thereof

A technology of silane cross-linking and silane cross-linking agent, which is applied in the field of electrochemistry, can solve problems such as unsatisfactory thermal shrinkage, difference between membrane rupture temperature and closed cell temperature, and achieve excellent comprehensive performance, low closed cell temperature, and low The effect of mean pore size

Inactive Publication Date: 2018-06-22
SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a silane crosslinked polymer isolation membrane and its preparation method, which is used to solve the difference between the rupture temperature and the closed cell temperature difference in the isolation membrane in the prior art. And the problem of unsatisfactory heat shrinkage

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  • Silane crosslinked polymer separation film and preparation method thereof
  • Silane crosslinked polymer separation film and preparation method thereof
  • Silane crosslinked polymer separation film and preparation method thereof

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preparation example Construction

[0046] Such as figure 1 As shown, the present invention also provides a method for preparing the above-mentioned silane cross-linked polymer isolation film. The silane cross-linked polymer isolation film is prepared by chemical cross-linking. The preparation method is roughly as follows: raw material mixing, mixture extrusion, casting Making strips, extracting strips, washing to obtain films, heat-setting the obtained films, winding, etc. Specifically, at least include the following steps:

[0047] S1, mixing ultra-high molecular weight polyethylene, high-density polyethylene, pore-forming agent, antioxidant, auxiliary cross-linking agent and silane cross-linking agent, and stirring uniformly to form a mixture, the molecular weight of the ultra-high molecular weight polyethylene is between 1.0 ×10 6 ~10.0×10 6 Between, the density of the high-density polyethylene is between 0.940 ~ 0.976g / cm 3 between;

[0048] S2, using a twin-screw extrusion process, at a certain temper...

Embodiment 1

[0079] The density of 220 grams is 0.956g / cm 3 High-density polyethylene with a molecular weight of 5.0×10 in 100 grams 6 Ultra-high molecular weight polyethylene, 6.4 g antioxidant (β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate n-octadecanoate), silane crosslinker (vinyltrimethylsilane ), 4.3 grams of auxiliary cross-linking agent (triallyl isocyanurate), 2200 grams of mineral oil (i.e. pore forming agent, CAS8020-83-5, purchased from Lanzhou Petrochemical Company) adds in the continuous batching feed kettle, with Stir at a speed of 50 rpm to mix the ingredients evenly.

[0080] The mixture is continuously fed into the twin-screw extruder, and the ultra-high molecular weight polyethylene, high-density polyethylene, antioxidant, silane crosslinking agent and co-crosslinking agent are continuously dissolved in the twin-screw extruder under the condition of 180°C in mineral oil, and then extruded continuously by a twin-screw extruder at a speed of 200 rpm, the mixture conti...

Embodiment 2

[0086] The density of 220 grams is 0.956g / cm 3 High-density polyethylene with a molecular weight of 5.0×10 in 100 grams 6 Ultra-high molecular weight polyethylene, 6.4 grams of antioxidant (β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate n-octadecanoate), 4.8 grams of silane crosslinking agent (vinyl trimethyl base silane), auxiliary crosslinking agent (triallyl isocyanurate), and 2200 grams of mineral oil are added in the continuous batching and feeding kettle, stirred at a speed of 50 rpm, and the raw materials are mixed evenly.

[0087] The mixture is continuously fed into the twin-screw extruder, and the ultra-high molecular weight polyethylene, high-density polyethylene, antioxidant, silane crosslinking agent and co-crosslinking agent are continuously dissolved in the twin-screw extruder under the condition of 180°C in mineral oil, and then extruded continuously by a twin-screw extruder at a speed of 200 rpm, the mixture continuously enters the slot die, and the mixture...

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Abstract

The invention provides a silane crosslinked polymer separation film, which comprises crosslinked polymerized ultrahigh molecular weight polyethylene, high-density polyethylene, an antioxidant, an assistant crosslinker and a silane crosslinking agent, wherein the molecular weight of the ultrahigh molecular weight polyethylene is 1.0*10<6> to 10.0*10<6>; the density of the high-density polyethyleneis 0.940-0.976g / cm<3>; and on the basis of 100 parts by weight of a mixture of the ultrahigh molecular weight polyethylene and the high-density polyethylene, the weight of the antioxidant is 0.5-20 parts, the weight of the assistant crosslinker is 0.1-10 parts and the weight of the silane crosslinking agent is 0.1-10 parts. The separation film is prepared through a chemical crosslinking method, sothat a difference value between the film rupture temperature and the obturator temperature of the prepared silane crosslinked polymer separation film and the hot shrinkage rate are improved and the safety performance of a battery is higher.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a silane crosslinked polymer isolation membrane 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 can be see...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M50/40H01M50/403H01M50/417
CPCH01M50/403H01M50/411Y02E60/10
Inventor 程跃熊磊曾鹏
Owner SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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