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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 technical problem of poor overall performance of the existing diaphragm in the prior art

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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preparation example Construction

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

[0040]S1. Prepare PVDF primary particles 211 by emulsion polymerization, the particle diameter D50 of the primary particles 211 is 50nm-500nm, and polymerize the primary particles 211 into secondary particles 212, the particle diameter D50 of the secondary particles 212 is 0.5μm-20μm; 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 slurry is 10-30%, and the binder accounts for 1-20% of the secondary particles 212. Stir to form a uniform bonding slurry; S3. Spray the bonding slurry on one side of the base film using a rotating nozzle On 10, the spraying flow rate of the rotary nozzle is 50-500ml / min, and the rotation speed ...

Embodiment 1

[0049] S1. Preparation of secondary particles 212

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

[0051] S2. Configure bonding slurry

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

[0053] S3, spraying

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

[0055] S4, dry and prepare diaphragm B1

[0056] Place the coated separator in an oven and fully dry it at 60°C to obtain separator B1 after drying, with a polymer coati...

Embodiment 2

[0058] The difference from Example 1 is that the secondary particles 212 of PVDF are not piled up, and the primary particles 211 are directly used for subsequent spraying slurry preparation, and the other steps are unchanged, and the separator B2 is obtained. The polymer coating load after drying is 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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