Composite microporous membrane used as lithium ion battery diaphragm as well as preparation method and application thereof

A technology of lithium ion battery and microporous membrane is applied in the field of composite microporous membrane and its preparation, which can solve the problems of complex manufacturing method and process and high membrane cost, and achieve the effects of good safety, stable performance and easy industrialization.

Active Publication Date: 2011-07-13
河南惠强新能源材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Jointly developed by Exxon Mobil Corporation (EXXON) and Tonen Chemical Co., Ltd., a variety of polymers are combined into a multilayer co-extruded porous membrane. This separator impr

Method used

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  • Composite microporous membrane used as lithium ion battery diaphragm as well as preparation method and application thereof
  • Composite microporous membrane used as lithium ion battery diaphragm as well as preparation method and application thereof
  • Composite microporous membrane used as lithium ion battery diaphragm as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Dissolve photosensitive polyethyl cinnamate acrylate (PCEM) with active hydrogen in acetone solvent, prepare a modified solution a with a mass concentration of 1%, and then apply a polypropylene porous skeleton membrane (thickness 8 μm, porosity 40 %, the average pore size is 0.6 μm) is immersed in the above-mentioned modification solution, and the modified microporous membrane is obtained through UV cross-linking and anchored and introduced active hydrogen groups on the surface of the membrane micropores.

[0046] The above-mentioned modified microporous membrane was immersed in the modified solution b (1% polyimide with hydroxyl group, 5% SiO with a particle size of 1 μm 2 , 10% LiBr, 0.05% TEOS, the solvent is acetone); the temperature is controlled at 10°C, and then 0.05% ammonia water is added to the solution, and taken out after about 15 hours.

[0047] Immerse the above-mentioned modified microporous membrane into a phase transfer agent (acetone: water=5:1, volum...

Embodiment 2

[0049] Dissolve photosensitive poly(hydroxyethyl methacrylate-co-cinnamate ethyl acrylate) (P(HEMA-co-CEA) with active hydrogen in acetone solvent to prepare a modified solution with a mass concentration of 20% a. Then the polypropylene porous skeleton membrane (thickness is 60 μm, porosity 76%, pore diameter 0.4 μm) is immersed in the above-mentioned modification solution, obtains through UV cross-linking and obtains through anchoring and introduces the active hydrogen group on the surface of membrane micropores Modified Microporous Membranes.

[0050] The above-mentioned modified microporous membrane is immersed in the modification solution b (40% polyethylene terephthalate with hydroxyl, 60% MgO with a particle size of 10 μm, 80% DMF, 30% TEOS, and the solvent is NMP); The temperature is controlled at 80°C, and then 60% ammonia water is added to the solution, and taken out after about 0.5 hours.

[0051] Immerse the above-mentioned modified microporous membrane into a phas...

Embodiment 3

[0053] Dissolve photosensitive poly(hydroxyethyl methacrylate-co-cinnamate ethyl methacrylate) (P(HEMA-co-CEMA) with active hydrogen in tetrahydrofuran solvent, and prepare a modified solution with a mass concentration of 10%. Liquid a. Then the polyethylene porous skeleton membrane (membrane thickness between 30 μm, porosity 50%, pore size 0.5 μm) is immersed in the above-mentioned modifying solution, which is anchored by UV cross-linking and introduced into the membrane microporous surface. Microporous membranes modified by hydrogen groups.

[0054] The above-mentioned modified microporous membrane was immersed in the modified solution b (20% polyamide-imide with hydroxyl group, 30% SiO with a particle size of 5 μm 2 , 50% PEO, 15% TEOS, the solvent is pyridine); the temperature is controlled at 50° C., then 25% ammonia water is added to the solution, and it is taken out after about 7.0 hours.

[0055] Immerse the above-mentioned modified microporous membrane into a phase t...

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Abstract

The invention discloses a composite microporous membrane used as a lithium ion battery diaphragm as well as a preparation method and application thereof. The composite microporous membrane is prepared by the following steps of: steeping a polyolefin porous framework membrane in a modified liquid a and carrying out radiation crosslinking to obtain a modified framework membrane; preparing a modified liquid b, steeping the modified framework membrane in the modified liquid b and adding a sol-gel reaction catalytic agent to carry out a sol-gel condensation reaction; and immersing the modified membrane in a phase transforming agent solution, carrying out phase conversion to form a membrane and then drying to obtain a high-performance polymer/inorganic composite microporous membrane. In the invention, the preparation process is simple and the industrialization is easy to realize; the obtained composite microporous membrane has high air permeability, good electrolyte-favoring performance andhigh temperature resistance, a composite layer and the framework polyolefin membrane have good adhesion strength and cannot be separated when being placed in a lithium ion electrolyte solution with very good adhesion and without power-dropping and shedding. By means of the product of the invention, a series of defects in the prior art can be overcome.

Description

technical field [0001] The invention relates to the field of lithium-ion battery separator materials, in particular to a composite microporous membrane used as a lithium-ion battery separator and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products such as mobile phones, notebook computers, camcorders, etc., and the development of electric vehicles will also drive greater demand for lithium-ion batteries. Lithium-ion batteries are used in aerospace, navigation, and artificial satellites. , Small medical, military communication equipment and other fields have also been applied, gradually replacing traditional batteries. [0003] Lithium-ion batteries are mainly composed of three core components: electrodes, electrolytes, and separators. Although the separator does not participate in the electrochemical reactions during the use of lithium-ion batteries, it has an impact on the power de...

Claims

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Application Information

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IPC IPC(8): H01M2/16C08J7/12
CPCY02E60/12Y02E60/10
Inventor 胡继文肖定书卢汝烽胡美龙
Owner 河南惠强新能源材料科技股份有限公司
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