Diaphragm with excellent cohesiveness and air permeability and preparation method thereof

A gas-permeable and cohesive technology, applied in the direction of separators/films/diaphragms/spacers, electrical components, structural parts, etc., can solve the problems of poor comprehensive performance of the diaphragm, achieve a small cross-overlapping range, and ensure stability performance, to ensure the effect of breathability

Active Publication Date: 2022-02-25
JIANGSU ADVANCED MATERIAL TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: to solve the te

Method used

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  • Diaphragm with excellent cohesiveness and air permeability and preparation method thereof
  • Diaphragm with excellent cohesiveness and air permeability and preparation method thereof
  • Diaphragm with excellent cohesiveness and air permeability and preparation method thereof

Examples

Experimental program
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Effect test

Example Embodiment

[0039] The present application also provides a method for preparing a separator with excellent adhesion and air permeability, comprising the following steps:

[0040]S1. Prepare PVDF primary particles 211 by emulsion polymerization, the particle size D50 of the primary particles 211 is 50 nm-500 nm, and the primary particles 211 are polymerized into secondary particles 212, and the particle size D50 of the secondary particles 212 is 0.5 μm-20 μm; S2. Mix the secondary particles 212, PMMA microspheres, binder, and deionized water according to a preset weight ratio. The particle size of the added PMMA microspheres is 1-15 μm, and the PMMA content accounts for 5-30% of PVDF. The solid content of the bonding slurry is 10-30%, the binder accounts for 1-20% of the secondary particles 212, and a uniform bonding slurry is formed by stirring; S3. Use a rotary nozzle to spray the bonding slurry on one side of the base film Step 10, the spray flow rate of the rotary nozzle is 50-500ml / mi...

Example Embodiment

[0048] Example 1:

[0049] S1. Preparation of secondary particles 212

[0050] The PVDF primary particles 211 were prepared by emulsion polymerization with D50 of 240 nm, washed, spray-dried and sieved to obtain PVDF secondary particles 212, wherein the PVDF powder particle size D50 was 6.2 μm.

[0051] S2, configure the adhesive paste

[0052] A binder solution with a mass fraction of 15%, the binder is styrene-butadiene latex, PVDF, binder, and deionized water are mixed, and a uniform slurry is formed by stirring. The speed of the mixer is 700rpm, and the solid content of the slurry is 20%. , in which the binder accounts for 7.5% of the mass of PVDF.

[0053] S3, spraying

[0054] The slurry is uniformly sprayed on the surface of the 9-micron PE base film 10 on one side, the flow rate of a single rotary spraying equipment is 150 ml / min, and the speed is 10000rpm;

[0055] S4, drying to obtain diaphragm B1

[0056] The coated separator was placed in an oven and fully dri...

Example Embodiment

[0057] Example 2:

[0058] The difference from Example 1 is that the secondary particles 212 of PVDF are not stacked, and the primary particles 211 are directly used for the subsequent preparation of the spraying slurry. The other steps remain unchanged, and the diaphragm B2 is obtained. 0.64g / m 2 .

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Abstract

The invention relates to the technical field of lithium batteries, in particular to a diaphragm with excellent cohesiveness and air permeability and a preparation method thereof. The diaphragm comprises a base film and a bonding layer, the bonding layer is arranged on at least one surface of the base film and comprises a plurality of hollowed-out structures, each hollowed-out structure is fixed to the surface of the base film, the hollowed-out structures are defined by protruding parts, and the inner parts enclosed by the protruding parts are hollowed-out parts. According to the diaphragm with excellent cohesiveness and air permeability and the preparation method of the diaphragm, the thermal shrinkage performance of a ceramic coated diaphragm is maintained, the bonding strength between the diaphragm and a pole piece is met through relatively low glue content, the good air permeability of the diaphragm is also maintained, and the comprehensive performance of a battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a separator with excellent adhesion and gas permeability and a preparation method thereof. Background technique [0002] Lithium-ion batteries generally include a positive electrode, a negative electrode, a separator, and an electrolyte. As a key component, the diaphragm can prevent the short circuit of the positive and negative electrodes of the lithium-ion battery, provide a channel for transporting ions, and block the transmission of lithium ions through closed cells under uncontrolled conditions to prevent accidents. Therefore, the research on improving the safety, usability, and manufacturability of lithium-ion batteries by improving the performance of the separator has received more and more attention. [0003] In the case of manufacturing rechargeable lithium batteries, if the electrodes are not properly bonded to the separator, the positive and negative electro...

Claims

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Application Information

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IPC IPC(8): H01M50/443H01M50/449H01M50/457H01M50/46H01M50/463H01M50/489H01M50/403H01M10/0525
CPCH01M50/461H01M50/463H01M50/449H01M50/457H01M50/403H01M50/443H01M50/489H01M10/0525Y02E60/10
Inventor 韦性强王晓明孙东岳张磊徐强
Owner JIANGSU ADVANCED MATERIAL TECH CO LTD
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