Lithium ion battery ceramic diaphragm coated with polyvinylidene fluoride, and preparation method therefor

A polyvinylidene fluoride, lithium-ion battery technology, applied in battery electrodes, battery pack components, separators/films/diaphragms/spacers, etc., can solve the problems of poor flexibility of diaphragms, easy cracking of ceramic slurry, etc. To achieve the effect of improving heat resistance, surface densification and safety performance

Inactive Publication Date: 2016-08-10
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the poor flexibility of the lithium-ion battery diaphragm in the prior art, the ceramic slurry coated on the surface of the diaphragm is easy to crack after drying, and the safety problems of the lithium-ion battery, the present invention proposes a lithium-ion battery coated with polyvinylidene fluoride Ceramic diaphragm and preparation method thereof

Method used

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  • Lithium ion battery ceramic diaphragm coated with polyvinylidene fluoride, and preparation method therefor
  • Lithium ion battery ceramic diaphragm coated with polyvinylidene fluoride, and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A lithium-ion battery ceramic diaphragm coated with polyvinylidene fluoride, including a substrate diaphragm, and the two surfaces of the substrate diaphragm are coated with ceramic slurry;

[0029] The lithium-ion battery ceramic separator coated with polyvinylidene fluoride is prepared by the following steps:

[0030] 1. Use polyethylene and polypropylene three-layer composite diaphragm as the substrate, and the substrate diaphragm thickness is 20um. Mix and disperse polyvinylidene fluoride and N-methylpyrrolidone according to the weight ratio of 1:1 to obtain the dispersion glue;

[0031] 2. Mix the dispersion glue with Al 2 o 3 The particles are mixed and dispersed according to the weight ratio of 1:1 to obtain ceramic slurry;

[0032] 3. Use the gravure double-sided coating method to evenly coat the ceramic slurry on the surface of the substrate diaphragm, the coating speed is 25m / min, the coating thickness is 3um, Al 2 o 3 The particle size is 20nm, and dried ...

Embodiment 2

[0034] A lithium-ion battery ceramic diaphragm coated with polyvinylidene fluoride, including a substrate diaphragm, and the two surfaces of the substrate diaphragm are coated with ceramic slurry;

[0035] The lithium-ion battery ceramic separator coated with polyvinylidene fluoride is prepared by the following steps:

[0036] 1. The three-layer composite diaphragm of polyethylene and polypropylene is used as the substrate, and the thickness of the substrate diaphragm is 30um. Polyvinylidene fluoride and N-methylpyrrolidone are mixed and dispersed at a weight ratio of 1:1.5 to obtain a dispersion glue;

[0037] 2. Mix the dispersion glue with Al 2 o 3 The particles are mixed and dispersed according to the weight ratio of 1:2 to obtain ceramic slurry;

[0038] 3. Use the gravure double-sided coating method to evenly coat the ceramic slurry on the surface of the substrate diaphragm, the coating speed is 25m / min, the coating thickness is 3um, Al 2 o 3 The particle size is 20n...

Embodiment 3

[0040] A lithium-ion battery ceramic diaphragm coated with polyvinylidene fluoride, including a substrate diaphragm, and the two surfaces of the substrate diaphragm are coated with ceramic slurry;

[0041] The lithium-ion battery ceramic separator coated with polyvinylidene fluoride is prepared by the following steps:

[0042] 1. Using polyethylene and polypropylene copolymer separator as the substrate, the thickness of the substrate separator is 10um, mix and disperse polyvinylidene fluoride and dimethylacetamide according to the weight ratio of 1:15 to obtain the dispersion glue;

[0043] 2. Mix the dispersion glue with ZrO 2 , ThO 2 The particles are mixed and dispersed at a weight ratio of 1:5 to obtain a ceramic slurry;

[0044] 3. Apply the ceramic slurry evenly on the surface of the substrate diaphragm by gravure single-sided coating, the coating speed is 45m / min, the coating thickness is 7um, ZrO 2 , ThO 2 The particle size is 30nm, and dried at 90°C for 20 minutes...

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Abstract

The invention discloses a lithium ion battery ceramic diaphragm coated with polyvinylidene fluoride. The lithium ion battery ceramic diaphragm comprises a base material diaphragm, wherein at least one surface of the base material diaphragm is coated with ceramic slurry; the ceramic diaphragm is prepared by the following steps of mixing and dispersing polyvinylidene fluoride and a dispersing agent at a weight ratio of 1 to 0.1-50 to obtain a dispersion glue solution; mixing and dispersing the dispersion glue solution and ceramic granules at a weight ratio of 1 to 0.1-10 to obtain ceramic slurry; and uniformly coating the surface of the base material diaphragm with the ceramic slurry, and drying the base material diaphragm to obtain the lithium ion battery ceramic diaphragm coated with polyvinylidene fluoride. The surface of the base material diaphragm of the lithium ion battery is coated with the ceramic diaphragm of polyvinylidene fluoride and ceramic granules, wherein the ceramic diaphragm is 0.1-10um in thickness; the ceramic diaphragm is compact in surface and uniform in thickness; polyvinylidene fluoride has a relatively high decomposition temperature, so that the diaphragm can be protected when the surface of the base material diaphragm is coated with the polyvinylidene fluoride; and therefore, the thermal resistance of the diaphragm is improved, so that the safety performance of the lithium ion battery is further improved.

Description

[0001] technical field [0002] The invention belongs to the field of lithium ion batteries, in particular to a lithium ion battery ceramic diaphragm coated with polyvinylidene fluoride and a preparation method thereof. Background technique [0003] Lithium-ion batteries have a series of advantages: high specific energy, long cycle life, no memory effect, no pollution to the environment, high safety, fast charging and discharging, etc., so they have become the characteristics of new power supply technology research in recent years. China's new energy vehicles are developing rapidly and have become the world's largest producer of new energy vehicles. In 2015, the sales volume of new energy vehicles in my country exceeded 300,000. In a pure electric vehicle, the cost of the power battery accounts for the entire vehicle cost. Nearly half, and recently there have been endless safety issues about the "heart" power battery of new energy vehicles, which puts forward more stringent r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M4/66H01M50/409
CPCH01M4/664H01M50/409Y02E60/10
Inventor 张传明荆孟娜
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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