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Battery diaphragm and application thereof

A battery diaphragm and base film technology, applied in the direction of secondary batteries, battery components, circuits, etc., can solve the problems of increased tortuosity of diaphragm aperture, increased ionic conductivity, inconsistent porosity, etc., to improve wettability and absorption liquid performance, reduce ionic conductivity, and enhance the effect of heat resistance

Inactive Publication Date: 2015-05-06
SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium-ion batteries may catch fire or even explode under abuse conditions such as short circuit, overcharge, and extrusion, causing property damage and casualties
The safety issue of lithium-ion batteries has always been an obstacle restricting the larger-scale application of lithium-ion batteries
However, the disadvantage is that the cost of two coatings is high, and the porosity of the two coatings is inconsistent, which will increase the air permeability of the separator, increase the tortuosity of the diaphragm aperture, increase the ion conductivity, and reduce the performance of the battery.

Method used

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  • Battery diaphragm and application thereof
  • Battery diaphragm and application thereof
  • Battery diaphragm and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this example, 0.99 kg of polyvinylidene fluoride purchased from Arkema, D50 = 0.05um, and 8.91 kg of alumina purchased from Sumitomo Chemical, D50 = 0.4um, the weight ratio of these two nanoparticles is that of ceramic particles : Organic polymer particles = 9:1, add 15 kg of deionized water, and pre-mix for 180 min with a mixer at a linear speed of 10 m / min. Then disperse through sand milling equipment, the dispersion line speed is 25m / min, and the sand milling time is 20min. Then add 100 gram polyoxyethylenes, make the weight ratio of binder and nano particle be binder: nano particle=1:99, stir 300min with the linear velocity of 5m / min, vacuumize 180min, obtain total solid content be 40 % of coating slurry. A PE diaphragm with a thickness of 9 um purchased from Asahi Kasei, Japan was used as a base material, and coated by a micro-gravure coater to obtain a composite diaphragm with a thickness of 12 um.

Embodiment 2

[0030] In this example, 4.75 kg of polyvinylidene fluoride purchased from Arkema, D50 = 0.6um, and 4.75 kg of alumina purchased from Sumitomo Chemical, D50 = 2.0um, the weight ratio of these two nanoparticles is that of ceramic particles : Organic polymer particles = 1:1, add 15 kg of deionized water, and pre-mix for 180 min with a mixer at a linear speed of 10 m / min. Then disperse through conical mill equipment, the dispersion line speed is 40m / min, and the residence time is 600s. Add 600 gram polyoxyethylenes then, make the weight ratio of binder and nano particle be binder: nano particle=5:95, stir 300min with the linear velocity of 5m / min, vacuumize 180min, obtain total solid content and be 40 % of coating slurry. A 9um PE separator purchased from Asahi Kasei, Japan was used as a base material, and coated by an extrusion coater to obtain a composite separator.

Embodiment 3

[0032]In this example, 1.92 kg of polyvinylidene fluoride purchased from Arkema, D50 = 0.2um, and 7.68 kg of alumina purchased from Sumitomo Chemical, D50 = 0.6um, the weight ratio of these two nanoparticles is that of ceramic particles : Organic polymer particles=8:2, add 15 kg of deionized water, and pre-mix for 180 min with a mixer at a linear speed of 10 m / min. Then disperse through high-speed dispersing equipment, the dispersion line speed is 50m / min, and the residence time is 60s. Add 400 gram polyoxyethylenes then, make the weight ratio of binder and nano particle be binder: nano particle=4:96, stir 300min with the linear velocity of 5m / min, vacuumize 180min, obtain total solid content to be 40 % of coating slurry. A 9um PE separator purchased from Asahi Kasei, Japan was used as a base material, and coated by a three-roll coater to obtain a composite separator with a thickness of 12um.

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Abstract

The invention discloses a battery diaphragm and application thereof. The battery diaphragm provided by the invention is composed of a base membrane and a nanoparticle coating coated on at least one surface of the base membrane. The nanoparticle coating contains at least two nanoparticles, which include ceramic particles and organic polymer particles. According to the battery diaphragm provided by the invention, the organic polymer particles are firstly added into the nanoparticle coating, thus not only enhancing the porosity of the nanoparticle coating, reducing the ionic conductivity of the battery diaphragm, but also enhancing the heat resistance of the battery diaphragm, decreasing the dosage of ceramic particles, and reducing the thickness of the nanoparticle coating. In addition, by adding the organic polymer particles, certain caking property exists between the battery diaphragm and the battery anode and cathode, so that the prepared battery has better oneness, and the diaphragm electrolyte solution wettability and absorption performance can also be improved, thus laying the foundation for providing lithium ion batteries with high security performance.

Description

technical field [0001] The present application relates to the field of battery separators, in particular to a battery separator and its application. Background technique [0002] In recent years, portable mobile devices such as notebook computers, mobile phones, digital cameras and video cameras have become increasingly popular, and are developing in the direction of miniaturization and thinning. At the same time, electric bicycles, hybrid electric vehicles and pure electric vehicles have also developed rapidly and have begun to be commercialized on a large scale. Correspondingly, as the power source of these tools, the requirements for battery capacity and energy density are also higher. Secondary batteries represented by lithium-ion batteries have the characteristics of high specific energy and many cycle times, and are not only widely used in various portable mobile devices, but also in large-scale electric vehicles such as electric vehicles. However, lithium-ion batter...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/446
CPCH01M10/0525H01M50/403H01M50/446H01M50/449Y02E60/10
Inventor 于长溥张胜刚曹志锋瞿威张辉
Owner SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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