Porous ceramic diaphragm slurry and preparation method thereof, battery diaphragm and battery

A technology of porous ceramics and battery separators, which is applied in battery pack parts, circuits, electrical components, etc., can solve the problems that the electrolyte cannot effectively increase the liquid retention capacity, the electrolyte adsorption effect is small, and the battery liquid retention capacity cannot be improved. Achieve the effect of increasing cycle life, reducing diaphragm resistance, and ensuring heat resistance

Pending Publication Date: 2019-05-10
SOUNDON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the current lithium-ion batteries, except for the adsorption of the electrolyte by the pole piece and the separator, the free electrolyte will be extracted out of the battery during the battery degassing molding process. The amount of electrolyte cannot effectively increase the liquid retention capacity, and the general diaphragm has little adsorption effect on the electrolyte, which cannot increase the liquid retention capacity of the battery

Method used

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  • Porous ceramic diaphragm slurry and preparation method thereof, battery diaphragm and battery
  • Porous ceramic diaphragm slurry and preparation method thereof, battery diaphragm and battery
  • Porous ceramic diaphragm slurry and preparation method thereof, battery diaphragm and battery

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preparation example Construction

[0028] The preparation method of the porous ceramic diaphragm slurry according to an embodiment of the present invention includes the following steps S1-S4:

[0029] S1. Corroding ceramic powder with hydrofluoric acid to obtain porous ceramic powder, the ceramic powder is made of at least two ceramic materials.

[0030] S2. Activate the porous ceramic powder by mixing it with hydrochloric acid or nitric acid to obtain activated porous ceramic powder.

[0031] S3. Coating the activated porous ceramic powder with a silane coupling agent to obtain a sensitized porous ceramic powder.

[0032] S4, mixing the binder and the organic solvent with the sensitized porous ceramic powder, and stirring evenly to obtain a porous ceramic diaphragm slurry.

[0033] The role of the separator in the lithium-ion battery is to physically isolate the positive and negative electrodes of the battery to prevent internal short circuits, and on the other hand to provide a channel for lithium ions to sh...

Embodiment 1

[0048] Dry the commercially available fluorphlogopite (particle size: 0.01-1 μm), nano-alumina (particle size: 2-10 nm), fluoroapatite (particle size: 0.01-1 μm), and cryolite in a vacuum oven at 300 °C. 24h, remove the water molecules adsorbed on the surface of the ceramic micropowder. Mix the four dried powders uniformly in a ball mill with a mass ratio of 0.2:8.5:0.8:0.1, then put them into a boron nitride crucible, and melt them in a silicon-molybdenum rod furnace at a melting temperature of 1800°C to 2000°C (due to A small amount of cryolite is added to reduce the melting point of alumina to about 1500°C), and the holding time is 2 to 2.5 hours. After melting, the obtained ceramic liquid is quickly poured into cold distilled water and quenched to obtain ceramic granules. After drying, the melting and quenching are repeated twice, and the parameters remain unchanged. Put ceramic granules, zirconia balls and absolute ethanol in a mass ratio of 1:1.5:0.5, and stir in a ball...

Embodiment 2

[0056] The difference from Example 1 is that the slurry is only coated on one side of the base film, and the coating amount is 20.58g / m 2 .

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Abstract

The invention relates to porous ceramic diaphragm slurry and a preparation method and application thereof. The preparation method comprises the following steps: corroding ceramic powder by using hydrofluoric acid to obtain porous ceramic powder, wherein the ceramic powder is made of at least two ceramic materials; mixing the porous ceramic powder and hydrochloric acid or nitric acid to perform activation so as to obtain activated porous ceramic powder; cladding a surface of the activated porous ceramic powder by using silane coupling agent to obtain sensitive porous ceramic powder; mixing thesensitive porous ceramic powder with adhesive and organic solvent, uniformly stirring to obtain the porous ceramic diaphragm slurry. The ceramic powder prepared from a plurality of ceramic materials is corroded through the hydrofluoric acid, the porous ceramic powder which is the porous structure is manufactured by utilizing the corrosion speed difference on different types of ceramic materials byutilizing the hydrofluoric acid, the porous ceramic powder obtains the porous ceramic diaphragm slurry through activation, sensitization and like treatment; the porous ceramic diaphragm slurry can obviously improve the electric performance of the battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a porous ceramic diaphragm slurry and a preparation method thereof, a battery diaphragm and a battery. Background technique [0002] With the lack of non-renewable energy and the control of environmental pollution by the whole society, the development of new energy has become an irresistible trend. Lithium-ion batteries have been widely used in the fields of electric vehicles and energy storage because of their advantages such as large specific energy, light weight, good cycle life, low self-discharge rate, no memory effect, and environmental friendliness. With the continuous expansion of the application range of lithium-ion batteries, various industries have put forward more stringent requirements on the performance of lithium-ion batteries, such as the increase of battery capacity, the increase of battery cycle life and the improvement of battery safety performance. Soft-pac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/417H01M50/434H01M50/491
CPCY02E60/10
Inventor 李景夫易四勇林琳林洋任超
Owner SOUNDON NEW ENERGY TECH CO LTD
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