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Inorganic nano particle hybridized polyolefin microporous membrane and preparation method thereof

A technology of inorganic nanoparticles and polyolefin microporous membranes, applied in the field of diaphragm products, can solve problems such as thermal deformation, poor thermal stability, battery safety accidents, etc., achieve improved heat resistance and shrinkage resistance, and simple process flow Ease of operation and improvement of mechanical properties

Inactive Publication Date: 2014-11-19
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above technologies have their own shortcomings, such as glue application will reduce the liquid absorption and conductivity of the diaphragm, and the general method of compounding (such as hot pressing) will cause ceramic particles to fall off
Ordinary polyolefin separators have poor dimensional thermal stability. For example, polyethylene separators thermally shrink at 85°C and thermally deform significantly at 110°C, which may easily cause internal short circuits in the battery and cause safety accidents.

Method used

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  • Inorganic nano particle hybridized polyolefin microporous membrane and preparation method thereof
  • Inorganic nano particle hybridized polyolefin microporous membrane and preparation method thereof

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preparation example Construction

[0033] The preparation method of the present invention, on the basis of the previous technical scheme, specifically, the preparation method of lipophilic electrically insulating inorganic nanoparticles in step (1) is as follows: the inorganic nanopowder is dispersed in water or alcohol solution by ultrasonic, The volume ratio of water and alcohol in the alcohol solution is 1:5-1:0; select a modifier or coupling agent to prepare the solution, add it to the inorganic nanoparticle slurry and mix, heat up to 80-100°C and stir at constant temperature for 2-5 hours; stop the reaction, filter with suction, extract and wash with absolute alcohol, dry and grind the obtained modified inorganic nanoparticles in vacuum at 80-100° C. for later use.

[0034] In the preparation method of the present invention, on the basis of the previous technical scheme, the specific modifier or coupling agent is one of silane coupling agent, titanate coupling agent or aluminate coupling agent, anionic surf...

Embodiment 1

[0038] Firstly, silane coupling agent was used to modify the lipophilicity of alumina to obtain lipophilic nano-alumina. Add diluent and ultra-high molecular weight polyethylene in a certain proportion to twin-screw extruder B for plasticization and blending; add modified alumina to paraffin oil for heating and ultrasonic dispersion, and add double Screw extruder A plasticizes and blends. The melt formed by extruders A and B passes through the die head and quenching roll to form an oil film. The oil film is prepared by biaxial stretching, extraction, heat setting and other processes to prepare a microporous membrane with inorganic nanoparticle hybrid ultra-high molecular weight polyethylene, refer to figure 1 , the polyolefin layer 1 on the upper and lower surfaces, and the inorganic nanoparticle hybrid layer 2 between the polyolefin layers on the upper and lower surfaces. The nano-hybrid microporous membrane of ABA structure is a diaphragm with a thickness of 12±1 μm, a por...

Embodiment 2

[0040] Firstly, lipophilic aluminum nitride was modified by silane coupling agent to obtain lipophilic nano-aluminum nitride. Add diluent and ultra-high molecular weight polyethylene in a certain proportion to twin-screw extruder B for plasticization and blending; add modified aluminum nitride to paraffin oil to heat, ultrasonically disperse, and add in a certain proportion to ultra-high molecular weight polyethylene Twin-screw extruder A plasticizes and blends. The melt formed by extruders A and B passes through the die head and quenching roll to form an oil film. The oil film is prepared by biaxial stretching, extraction, heat setting and other processes to prepare a microporous membrane with inorganic nanoparticle hybrid ultra-high molecular weight polyethylene, refer to figure 1 , the polyolefin layer 1 on the upper and lower surfaces, and the inorganic nanoparticle hybrid layer 2 between the polyolefin layers on the upper and lower surfaces. The nano-hybrid microporous ...

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Abstract

The invention discloses an inorganic nano particle hybridized polyolefin microporous membrane which includes an upper surface polyolefin layer and a lower surface polyolefin layer. At least one inorganic nano particle hybridizing layer is disposed between the upper surface polyolefin layer and the lower surface polyolefin layer in a laminated manner. The inorganic nano particle hybridizing layer is a mixed structure composed of an electrically-insulating inorganic nano particle and polyolefin, wherein the electrically-insulating inorganic nano particle is lipophilically modified through a modifying agent or a coupling agent. The microporous membrane is 5-40 [mu]m in a thickness, is 25-100 nm in an average pore size, is not more than 2.0 in a thermal shrinkage at 135 DEG C, is more than 145 MPa in an MD tensile strength and is more than 130 MPa in an TD tensile strength. The invention also discloses a method for preparing the microporous membrane. The microporous membrane has advantages of being capable of inhibiting thermal shrinkage, being high in tensile strength and being high in fusing temperature.

Description

technical field [0001] The invention relates to diaphragm products, in particular to an inorganic nanoparticle hybrid polyolefin microporous membrane capable of inhibiting heat shrinkage, high in tensile strength and high in fusing temperature and a preparation method thereof. Background technique [0002] Lithium-ion batteries have good stability and large specific energy. With the popularization of 3C products and the rise of the electric vehicle market, the demand for lithium-ion secondary batteries is increasing. However, the safety of lithium-ion batteries has always been a major problem in the industry. Lithium-ion batteries are different from lead-acid batteries and nickel-chromium batteries. When the voltage continues to rise, the electrolyte and diaphragm will be oxidized. In particular, the high temperature generated during battery discharge will cause the diaphragm to shrink and rupture, resulting in a short circuit between the positive and negative electrodes. C...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14
CPCH01M10/0525H01M50/403H01M50/446Y02E60/10
Inventor 王郗陈世章李旦邓豪陈良
Owner SHENZHEN SENIOR TECH MATERIAL
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