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A composite porous separator, a battery prepared from the separator and a preparation method thereof

A technology of separator and porous substrate, applied in the direction of separator/film/diaphragm/spacer element, secondary battery, battery pack parts, etc. safety effect

Active Publication Date: 2017-12-08
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a composite porous isolation membrane and its preparation method in view of the deficiencies of the prior art: that is, to coat a layer of ceramic layer on the surface of the porous substrate so as to improve the safety of the cell, Then in-situ polymerize inside the ceramic layer to form a polymer network structure to fix the ceramic coating to solve the problem of coating peeling off. Finally, the monomers selected to form the network structure polymer are symmetrical structural units with very good electrochemical properties. body, so it will not affect the final chemical properties of the cell

Method used

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  • A composite porous separator, a battery prepared from the separator and a preparation method thereof
  • A composite porous separator, a battery prepared from the separator and a preparation method thereof
  • A composite porous separator, a battery prepared from the separator and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1, different from Comparative Example 3, this Comparative Example includes the following steps:

[0048] Isolation film preparation: prepare the slurry according to the mass ratio of aluminum oxide (Rockwell hardness: 8.8): polyvinylidene fluoride: sodium carboxymethyl cellulose: water = 70:25:5:500, and then coat it on the poly Acrylic surface to obtain a composite isolation film; configure the solution according to the mass relationship of quaternary nonaneerythritol tetraacrylate: diisopropyl peroxydicarbonate: ethanol = 99.5:0.5:200; and then according to the weight of quaternary nonaneerritol tetraacrylate as According to the relationship of 0.1% of the quality of the porous coating, the above solution is sprayed uniformly on the surface of the composite isolation membrane. After the solution is fully infiltrated, the isolation membrane is baked at 70°C for 4 hours, so that the monomer is completely polymerized to produce the polymer, and the final product The...

Embodiment 2

[0050] Example 2, which is different from Comparative Example 3, is that this Comparative Example includes the following steps:

[0051] Isolation film preparation: prepare the slurry according to the mass ratio of aluminum oxide (Rockwell hardness: 8.8): polyvinylidene fluoride: sodium carboxymethyl cellulose: water = 70:25:5:500, and then coat it on the poly Acrylic surface to obtain a composite isolation film; configure the solution according to the mass relationship of quaternary nonaneerythritol tetraacrylate: diisopropyl peroxydicarbonate: ethanol = 99.5:0.5:200; and then according to the weight of quaternary nonaneerritol tetraacrylate as The quality of the porous coating is related to 1%. The above solution is sprayed uniformly on the surface of the composite isolation membrane. After the solution is fully infiltrated, the isolation membrane is baked at 70°C for 4 hours, so that the monomer is completely polymerized to produce polymer, and the final product The polymer ne...

Embodiment 3

[0053] Example 3 is different from Comparative Example 3. This comparative example includes the following steps:

[0054] Isolation film preparation: prepare the slurry according to the mass ratio of aluminum oxide (Rockwell hardness: 8.8): polyvinylidene fluoride: sodium carboxymethyl cellulose: water = 70:25:5:500, and then coat it on the poly Acrylic surface to obtain a composite isolation film; configure the solution according to the mass relationship of quaternary nonaneerythritol tetraacrylate: diisopropyl peroxydicarbonate: ethanol = 99.5:0.5:200; and then according to the weight of quaternary nonaneerritol tetraacrylate as The quality of the porous coating is related to 5%. Spray the above solution uniformly on the surface of the composite isolation membrane. After the solution is fully infiltrated, the isolation membrane is placed in a 70℃ environment for 4 hours to completely polymerize the monomer to produce the polymer. The polymer network structure porous isolation m...

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Abstract

The invention belongs to the field of separator technology, and particularly relates to a composite porous separator, a battery prepared by the separator and a preparation method thereof: a composite porous separator, comprising a porous base material and a porous coating, coated on a composite porous base On at least one surface of the material; the polymer network structure is distributed in the composite porous substrate or / and the porous coating, and the polymer network structure fixes the components it encloses into a whole, and forms the aggregate Polymers with a network structure include polymers with symmetrical structures. Compared with the prior art, the porous base material of the present invention is coated with a layer of ceramic layer to improve the safety of the cell, and then polymerized in situ inside the ceramic layer to form a polymer network structure to fix the ceramic coating to solve the problem of coating. In order to solve the problem of layer shedding, the monomer selected to form the network structure polymer is a symmetrical structure monomer with very good electrochemical performance, so it will not affect the final chemical performance of the battery.

Description

Technical field [0001] The invention belongs to the technical field of isolation membranes, and particularly relates to a composite porous isolation membrane and a preparation method thereof. Background technique [0002] Since 1991, carbon materials have been creatively used in the field of lithium-ion batteries and brought revolutionary changes in this field-after multiple charging and discharging efficiently and safely, they have been widely used in mobile phones, cameras, and notebooks. On computers and other portable appliances. Compared with traditional lead-acid, Ni-Cd, MH-Ni batteries, lithium-ion batteries have higher specific volume energy density, specific weight energy density, better environmental friendliness, smaller self-discharge and longer Cycle life, etc., is the ideal power supply for mobile electrical appliances, electric vehicle power supplies and power storage devices for power storage stations in the 21st century. [0003] However, with the improvement of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M10/0525H01M50/403H01M50/411H01M50/434H01M50/443H01M50/449H01M50/451H01M50/457H01M50/491
CPCH01M10/0525H01M50/403H01M50/409Y02E60/10
Inventor 杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH