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Ceramic diaphragm, and preparation method and application thereof

A ceramic diaphragm and diaphragm material technology, applied in electrical components, electrochemical generators, circuits, etc., can solve problems such as loss of isolation function, easy fire, and difference in diaphragm performance, so as to reduce VOC emissions, reduce fire risks, The effect of reducing energy consumption

Active Publication Date: 2014-02-12
PANYU NANSHA YAN TIN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the battery has a thermal runaway and generates a large amount of heat, and the temperature rises further to 160°C or above, the separator will melt and decompose or rupture, lose its isolation function, and the two poles will be short-circuited, which will lead to even more immeasurable dangers such as battery explosion. sexual appearance
Moreover, in the above-mentioned preparation method of the ceramic diaphragm, the thickness of the ceramic layer is uneven, the distribution of the ceramic particles is uneven, etc., resulting in a difference in the performance of the diaphragm.
Moreover, the organic solvents used in lithium batteries need to consume a lot of electric energy to volatilize and recycle. The use of organic solvents in the coating process is prone to fire and high energy consumption.

Method used

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  • Ceramic diaphragm, and preparation method and application thereof

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Comparison scheme
Effect test

Embodiment 1

[0029] Add 20g of alumina to 80g of water-soluble polyvinylidene fluoride, add an appropriate amount of water, and disperse at a high speed with a stirrer at a speed above 100rpm. During the dispersion process, add 0.1-3% of the weight of the ceramic particles. )-based phenol polyoxyethylene ether, and polyethylene glycol polyols accounting for 0.1-3% of the weight of the ceramic particles. After the dispersed slurry is stirred for 30-60 minutes, it is subjected to vacuum defoaming treatment to obtain a protective layer slurry;

[0030] The protective layer is coated on the base material of the diaphragm material, and then dried to form a coil of ceramic diaphragm film, and finally cut into finished ceramic diaphragm coils of various width specifications.

[0031] Such as figure 1 As shown, the intermediate layer of the ceramic diaphragm prepared above is the diaphragm material substrate 1, and the diaphragm material substrate

[0032] The material is a porous film layer made...

Embodiment 2

[0034] Add 30g of alumina to 70g of water-soluble acrylic resin, and add an appropriate amount of water, and use a stirrer to disperse at a speed of more than 100rpm at a high speed. During the dispersion process, add a defoamer accounting for 0.1-3% of the weight of the ceramic particles, and The dispersant accounts for 0.1-3% of the weight of the ceramic particles, and after the dispersed slurry is stirred for 30-60 minutes, it is subjected to vacuum defoaming treatment to obtain a protective layer;

[0035] The protective layer is coated on the base material of the diaphragm material, and then dried to form a coil of ceramic diaphragm film, and finally cut into finished ceramic diaphragm coils of various width specifications.

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Abstract

The invention discloses a ceramic diaphragm, and a preparation method and application thereof. The ceramic diaphragm comprises a diaphragm material substrate; the surface of the diaphragm material substrate is coated with a protective layer; the protective layer comprises 0.1% to 50% of ceramic particles and 50% to 99.9% of water-based polymer resin in percentage by weight. According to the invention, the water-based polymer resin is adopted to dispersing the ceramic particles, the use of poisonous N-methylpyrrolidine ketone with a high steam point can be avoided, an organic solvent is not required at all in the production process, solvent volatilization is eliminated, the emission of VOC is reduced, environmental protection is facilitated, energy consumed in the ceramic diaphragm production process can be lowered effectively, the risk of fire hazard can be reduced, and the cost can be lowered.

Description

technical field [0001] The invention relates to a ceramic diaphragm, in particular to an environmentally friendly and energy-saving ceramic diaphragm, a preparation method and application thereof. Background technique [0002] As an energy storage system with high energy density, high output voltage, no memory effect, excellent cycle performance, and environmental friendliness, lithium-ion battery has good economic benefits, social benefits and strategic significance, and has been widely used in mobile Communications, digital products and other fields, and it is very likely to become the most important power supply system in the field of energy storage and electric vehicles. [0003] The ceramic diaphragm is specially used to isolate the positive and negative electrodes of high-power lithium-ion batteries. It can not only isolate the contact between the positive electrode and the negative electrode of the battery, but also not hinder the electrolyte from penetrating the di...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/0525H01M50/414H01M50/434
CPCY02E60/122H01M50/403H01M50/446Y02E60/10
Inventor 周嘉林李兆辉藤川昇朱淑娴
Owner PANYU NANSHA YAN TIN CHEM
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