Preparation method of coating membrane containing PVDF and copolymer thereof

A technology of copolymer and diaphragm, which is applied in the field of preparation of diaphragm containing PVDF and its copolymer coating, which can solve the problems that the binder cannot act as a bonding layer, is prone to agglomeration, and the specific surface area of ​​ceramic particles and whiskers is large. , to achieve the effect of improving structural stability and safety, avoiding heat shrinkage, and not easy to disperse and deform

Active Publication Date: 2017-05-10
DONGGUAN ADVANCED ELECTRONICS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application number is CN201610068433.X, a lithium ion battery ceramic diaphragm slurry, which discloses a composite coating with ceramic nanoparticles and whiskers (alumina, boehmite) as filling materials, which can effectively reduce the lithium battery The thermal shrinkage rate of the diaphragm, but the specific surface area of ​​the ceramic particles and whiskers is large, it is easy to agglomerate, and the bond with the lithium battery pole piece is not strong, and the mechanical strength of the ceramic diaphragm is low, easy to break and puncture, causing short circuit of the lithium battery
The application numbers are CN201510057002.9 and CN201310497095.8 Lithium-ion battery composite diaphragms respectively provide a composite modified diaphragm coated on a film substrate after mixing polyvinylidene fluoride-hexafluoropropylene and ceramics in a certain proportion and A composite coating layered sequentially with ceramics, aramid resin and PVDF-HFP. The two modification methods both improved the thermal stability of the diaphragm and the adhesion between the coating and the diaphragm to a certain extent, and improved the The hardness of the lithium battery, but the compatibility between the high-polarity ceramics and the separator has not been substantially improved, and the binder in the coating cannot play the role of the bonding layer, and the separator will easily cause the coating to peel off when it is violently impacted , and with the rapid development of today's power / energy storage system requirements, the thermal stability of the diaphragm encounters greater challenges

Method used

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  • Preparation method of coating membrane containing PVDF and copolymer thereof
  • Preparation method of coating membrane containing PVDF and copolymer thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method containing PVDF and its copolymer coating diaphragm, comprises the following steps:

[0024] 1) Preparation of modified polypropylene microporous membrane: Soak a polypropylene microporous membrane with a thickness of 16 μm in the initiating solution formed by mixing 10 g of benzoyl peroxide and 500 g of acetone solution, and react for 1 h at a temperature of 100 ° C , and then evaporated to dryness at room temperature, and then soaked the evaporated polypropylene microporous membrane in a modified solution formed by mixing 10 parts of acrylic acid and 90 parts of water, and reacted at a temperature of 80 ° C for 5 hours. After ultrasonic rinsing and vacuum drying, the modified polypropylene microporous membrane was obtained;

[0025] 2) Preparation of modified alumina: Stir 300g of alumina powder and 500g of deionized water evenly, then add 30g of acrylic acid and 10g of benzoyl peroxide, react at a temperature of 80°C for 5h, then filter and dry ...

Embodiment 2

[0030] A preparation method containing PVDF and its copolymer coating diaphragm, comprises the following steps:

[0031] 1) Preparation of modified polypropylene microporous membrane: Soak a polypropylene microporous membrane with a thickness of 15 μm in an initiating solution formed by mixing 10 g of benzoyl peroxide and 500 g of acetone solution, and react for 2 hours at a temperature of 90° C. , and then evaporated to dryness at room temperature, then soak the evaporated polypropylene microporous membrane in a modified solution formed by mixing 10 parts of methacrylic acid and 90 parts of water, and react for 2 hours at a temperature of 100 ° C. , the modified polypropylene microporous membrane was obtained after ultrasonic rinsing and vacuum drying;

[0032] 2) Preparation of modified magnesium oxide: Stir 300g of magnesium oxide powder and 500g of deionized water evenly, then add 30g of methacrylic acid and 10g of benzoyl peroxide, react at a temperature of 80°C for 3h, t...

Embodiment 3

[0037] A preparation method containing PVDF and its copolymer coating diaphragm, comprises the following steps:

[0038] 1) Preparation of modified polypropylene microporous membrane: Soak a polypropylene microporous membrane with a thickness of 3 μm in a solution that is uniformly mixed with 20 g of benzoyl peroxide and 500 g of acetone to form an initiating solution at a temperature of 80° C. React for 3 hours, then evaporate to dryness at room temperature, and then soak the evaporated polypropylene microporous membrane in a modification solution formed by mixing 10 parts of methyl acrylate and 90 parts of water, at a temperature of 80 ° C After reacting for 3 hours, the modified polypropylene microporous membrane was obtained after ultrasonic rinsing and vacuum drying;

[0039] 2) Preparation of modified silica: Stir 300g of silica powder and 500g of deionized water evenly, then add 30g of methyl acrylate and 10g of benzoyl peroxide, react at a temperature of 80°C for 3 hou...

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Abstract

The invention provides a preparation method of a coating membrane containing PVDF and a copolymer thereof. The method comprises the following steps of (1) preparing a modified polyolefin microporous membrane; (2) preparing modified ceramic powder; (3) preparing modified ceramic slurry; (4) preparing water-based mixed slurry; and (5) coating, namely coating one side of the modified polyolefin microporous membrane prepared in the step (1) with the modified ceramic slurry prepared in the step (3) according to a certain coating mode and drying in an oven of 40-100 DEG C to obtain a ceramic coating, coating the outer surface of the ceramic coating with the water-based mixed slurry prepared in the step (4) according to a certain coating mode and drying in the oven of 40-100 DEG C to obtain a water-based coating, and preparing the coating membrane containing the PVDF and the copolymer thereof. According to the preparation method, the heat stability of the membrane can be improved, the conductivity of a lithium battery is improved, the condition that the membrane can be kept stable in structure for a long period of time is ensured and the use security of the lithium battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium battery diaphragm preparation, in particular to a method for preparing a coating diaphragm containing PVDF and its copolymer. Background technique [0002] As a new type of high-energy chemical power source, lithium-ion batteries, under the conditions of high temperature or high-efficiency charging and discharging, the thermal effect of the battery system will cause heat accumulation inside the battery, which can easily lead to thermal runaway, which will cause combustion and explosion of lithium batteries. Therefore, The safety of lithium batteries is our top priority. The application number is CN201610068433.X, a lithium ion battery ceramic diaphragm slurry, which discloses a composite coating with ceramic nanoparticles and whiskers (alumina, boehmite) as filling materials, which can effectively reduce the lithium battery The thermal shrinkage rate of the diaphragm, but the specific surface are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/42
CPCH01M10/4235H01M50/403H01M50/411H01M50/431Y02E60/10
Inventor 杨浩田王晓明韦程李景树
Owner DONGGUAN ADVANCED ELECTRONICS TECH
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