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A kind of asymmetric PVDF coated diaphragm and preparation method thereof

An asymmetric, coating technology, applied in the direction of structural parts, electrical components, battery pack components, etc., can solve the problems of battery electrical performance decline, battery performance decline, failure to take into account, etc., to improve consistency, adhesion, etc. Keep the force consistent and ensure the effect of electrical performance

Active Publication Date: 2022-06-17
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the charging and discharging process of lithium-ion batteries, there will be a gap between the separator and the positive and negative electrodes, resulting in a sharp drop in battery performance; the current mainstream solution is to coat PVDF on both sides of the separator to improve the adhesion between the separator and the positive and negative electrodes, so as to reduce the occurrence of
However, the mainstream solution does not take into account the differences in the surface of the positive and negative electrodes, so the adhesion between the PVDF coated separator and the positive and negative electrodes is different, so failure is likely to occur on the side with poor adhesion, which in turn causes The electrical performance of the battery is degraded

Method used

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  • A kind of asymmetric PVDF coated diaphragm and preparation method thereof
  • A kind of asymmetric PVDF coated diaphragm and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Preparation of PVDF slurry:

[0033] A. Preparation of the first PVDF slurry: the first PVDF slurry is obtained by mixing 1% of binder, 86% of deionized water, 8% of PVDF monomer, and 5% of auxiliary agent;

[0034] B. Preparation of the second PVDF slurry: 3% of binder, 86.9% of deionized water, 10% of PVDF monomer, and 0.1% of auxiliary agent are mixed to obtain the second PVDF slurry;

[0035] (2) Coating diaphragm:

[0036] A. Select the substrate, coat the second PVDF slurry on the lower surface of the substrate at a speed of 80m / min to obtain a second PVDF coating, and place the second PVDF coating at 60°C for two dryings, one drying 30s to obtain diaphragm A; the areal density of the second PVDF coating is 0.5g / m 2 ;

[0037] B. Coating the first PVDF slurry on the upper surface of the substrate at a speed of 80 m / min to obtain the first PVDF coating, placing the first PVDF coating at 60°C and drying for 30 s to obtain an asymmetric PVDF coating Separator...

Embodiment 2

[0039] (1) Preparation of PVDF slurry:

[0040] A. Preparation of the first PVDF slurry: 3% of binder, 90% of deionized water, 1% of PVDF monomer, and 6% of auxiliary agent are mixed to obtain the first PVDF slurry;

[0041] B. Preparation of the second PVDF slurry: 3% of binder, 75% of deionized water, 20% of PVDF monomer, and 2% of auxiliary agent are mixed to obtain the second PVDF slurry;

[0042] (2) Coating diaphragm:

[0043] A. Select the substrate, coat the second PVDF slurry on the lower surface of the substrate at a speed of 80m / min to obtain a second PVDF coating, and place the second PVDF coating at 60°C for two dryings, one drying 30s to obtain diaphragm A; the areal density of the second PVDF coating is 0.5g / m 2 ;

[0044] B. Coating the first PVDF slurry on the upper surface of the substrate at a speed of 80 m / min to obtain the first PVDF coating, placing the first PVDF coating at 60°C and drying for 30 s to obtain an asymmetric PVDF coating Separator; firs...

Embodiment 3

[0046] (1) Preparation of PVDF slurry:

[0047]A. Preparation of the first PVDF slurry: the first PVDF slurry is obtained by mixing 5% of binder, 90% of deionized water, 0.1% of PVDF monomer, and 4.9% of auxiliary agent;

[0048] B. Preparation of the second PVDF slurry: 5% of binder, 75% of deionized water, 10% of PVDF monomer, and 10% of auxiliary agent are mixed to obtain the second PVDF slurry;

[0049] (2) Coating diaphragm:

[0050] A. Select the substrate, coat the second PVDF slurry on the lower surface of the substrate at a speed of 80m / min to obtain a second PVDF coating, and place the second PVDF coating at 60°C for two dryings, one drying 30s to obtain diaphragm A; the areal density of the second PVDF coating is 0.5g / m 2 ;

[0051] B. Coating the first PVDF slurry on the upper surface of the substrate at a speed of 80 m / min to obtain the first PVDF coating, placing the first PVDF coating at 60°C and drying for 30 s to obtain an asymmetric PVDF coating Separator...

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PUM

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Abstract

The invention discloses an asymmetric PVDF coating diaphragm and a preparation method thereof. The coated diaphragm in the present invention includes a base material and a PVDF slurry; the PVDF slurry also includes a first PVDF slurry and a second PVDF slurry; the first PVDF slurry is coated on the upper surface of the substrate and formed The first PVDF coating; the second PVDF slurry is coated on the lower surface of the substrate and forms a second PVDF coating; the adhesion of the second PVDF coating is greater than that of the first PVDF coating Strength; the present invention prepares an asymmetric PVDF-coated diaphragm through different coating compositions and manufacturing processes. The adhesive strength of the positive and negative plates is kept consistent, which improves the consistency of the battery, while ensuring the electrical performance of the battery, and improving the cycle life and charge and discharge efficiency of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium battery separators, in particular to an asymmetric PVDF-coated separator and a preparation method thereof. Background technique [0002] Lithium-ion batteries are more and more widely used in power fields, such as electric vehicles; in 3C fields, such as mobile phones and tablet computers; in power tools, such as various hand-held power tools. With the expansion of the application range, the market has higher and higher requirements for the performance of lithium-ion batteries, which in turn puts forward higher requirements for lithium-ion battery separators. [0003] Lithium-ion batteries have four major components: positive electrode, negative electrode, diaphragm, and electrolyte. The diaphragm is located between the positive electrode and the negative electrode. Its main function is to separate the positive and negative electrodes to avoid short circuits in the battery. , allowing lithium ion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/426H01M50/417H01M50/457H01M50/403H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 张立斌李正林翁星星陈朝晖贡晶晶
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD