Aromatic polyamide composite membrane

An aromatic polyamide and composite diaphragm technology, applied in electrical components, electrochemical generators, circuits, etc., can solve problems such as affecting the production process, large fiber gaps, affecting production efficiency, etc., to simplify the production process and the preparation process. , the effect of improving production efficiency

Active Publication Date: 2016-06-01
BEIJING STAR RIVER INTEGRATED EQUIP TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the excessive gap between the fibers of the aromatic polyamide composite diaphragm in the prior art and the need to add a metal salt technical solution when preparing the composite membrane, the present invention affects the subsequent production process and affects the production efficiency. Polyamide has been studied in depth, and the technical solution adopted is to provide an aromatic polyamide composite diaphragm for lithium-ion batteries, which is characterized in that the aromatic polyamide composite diaphragm includes:

Method used

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  • Aromatic polyamide composite membrane
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Examples

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preparation example Construction

[0041] Now introduce an example of the preparation method of the present invention. In an embodiment of the method for preparing the composite diaphragm of the present invention, the method includes the following steps: add lithium salt to solvent A to dissolve completely, and then add aromatic polyamide and stir until completely dissolved , Slowly add an appropriate amount of water while stirring, control the water content so that the aromatic polymer does not precipitate directly from the solvent to obtain component A 1 . After adding inorganic nanoparticles and high-temperature closed-cell material in solvent B to fully disperse, add gel polymer to stir and dissolve and then disperse evenly to obtain component B 1 . Component A 1 Can be used alone as a coating liquid, or combined with component B 1 It is used as a coating liquid after being uniformly mixed and dispersed. The coating liquid is coated on one or both surfaces of the porous base film and dried to obtain the arom...

Embodiment 1

[0051] Add 10 parts of LiTFSI to 100 parts of DMAC and stir until it is completely dissolved, then add 10 parts of Aramid 1313 and continue to stir until completely dissolved, and then slowly drop 10 parts of deionized water into the solution to obtain component A 1 As a coating liquid. A 16μm thick polyethylene monolayer membrane prepared by wet biaxial stretching and a porosity of 40% was immersed in the resulting coating solution to obtain an aromatic polyamide composite with a 3μm thick coating on both sides after drying. Diaphragm. The performance of the composite diaphragm is shown in Table 1.

Embodiment 2

[0053] Add 10 parts of LiTFSM to 80 parts of NMP and stir until it is completely dissolved, add 10 parts of Aramid 1313 and continue to stir until completely dissolved, and then slowly drop 10 parts of deionized water into the solution to obtain component A 1 . Add 5 parts of PEO to 80 parts of DMAC, and obtain component B after complete dissolution 1 . Component A 1 And component B 1 After mixing uniformly, a coating liquid is formed. A polypropylene monolayer membrane with a thickness of 16μm and a porosity of 50% prepared by dry single drawing was immersed in the resulting coating solution to obtain an aromatic polyamide composite membrane coated with a 3μm thick coating on both sides after drying. . The performance of the composite diaphragm is shown in Table 1.

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Abstract

The invention provides an aromatic polyamide composite membrane in order to overcome the problem that a subsequent production process and production efficiency are affected due to overlarge fiber gaps of the aromatic polyamide composite membrane, and due to a technical scheme that metal salt is added in the preparation of the composite membrane in the prior art; the inventor provides the aromatic polyamide composite membrane used for a lithium ion battery through in-depth study on aromatic polyamide. According to the proposed technical scheme, the aromatic polyamide composite membrane is characterized by comprising a porous base membrane and an aromatic polyamide composite coating layer; the aromatic polyamide composite coating layer is characterized in that the coating layer is obtained by coating one or two surfaces of the porous base membrane with coating liquid containing aromatic polyamide, electrolyte lithium salt insensitive to water, a gel polymer and inorganic nanoparticles. The safety performance of the lithium ion battery is improved; and the membrane has good high-temperature-resistant thermal contraction performance, so that the safety performance of the lithium ion battery in the use process is improved consequently.

Description

Technical field [0001] The invention relates to a diaphragm for a lithium ion battery, in particular to a composite diaphragm. Background technique [0002] Lithium-ion batteries have become the main power source of various electronic products due to their high working voltage, high energy density (light weight), no memory effect, long cycle life, and no pollution. The market is very huge. It has been used in mobile phones, video recorders, and tablets. It is widely used in communication electronic products such as computers. In recent years, with the improvement of the safety performance of electrode materials, lithium-ion batteries have also begun to be used in some high-power power batteries such as electric vehicles, electric bicycles, and power tools. Power lithium-ion batteries have higher power / energy density than communication lithium-ion batteries, so higher requirements are put forward for the safety performance of power lithium-ion batteries. The diaphragm plays a ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M50/403H01M50/414H01M50/449
CPCH01M10/0525H01M50/403H01M50/449H01M50/411Y02E60/10
Inventor 汪为健李林
Owner BEIJING STAR RIVER INTEGRATED EQUIP TECH
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