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Ceramic diaphragm and preparation method and application thereof, and battery comprising ceramic diaphragm

A ceramic diaphragm and ceramic powder technology, applied in the field of electrochemistry, can solve the problems of battery combustion and explosion accidents, the diaphragm cannot provide electronic conductive partitions, and the flame retardant performance cannot provide sufficient insulation guarantees, so as to increase safety, Strong popularization and application value, the effect of stable flame retardant temperature

Inactive Publication Date: 2017-05-24
JIANGSU CHUHAN ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a short circuit occurs in the battery, a large amount of heat will be generated. At this time, the diaphragm will be near the melting temperature, the size of the diaphragm will shrink, and holes will appear. The diaphragm will basically not be able to provide electronic conductivity isolation function, and the battery will usually burn and explode.
[0003] To solve such problems, the patent CN101301586B of Evonik Degussa Co., Ltd., the patent CN100438140C of Samsung SDI Co., Ltd., and the patent CN102244223A of Dongguan New Energy Technology Co., Ltd. all propose to apply ceramic insulating coatings to increase the flame retardancy of the diaphragm. Although the temperature rise caused by short circuit can be partially alleviated, the temperature rise inside the battery may also be caused by some batteries being abused, such as external acupuncture, mechanical extrusion, etc. At this time, the conventional ceramic-coated polyolefin separator A single flame retardant performance cannot provide sufficient insulation protection

Method used

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  • Ceramic diaphragm and preparation method and application thereof, and battery comprising ceramic diaphragm
  • Ceramic diaphragm and preparation method and application thereof, and battery comprising ceramic diaphragm
  • Ceramic diaphragm and preparation method and application thereof, and battery comprising ceramic diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Preparation method: first mix 9wt% cerium oxide powder and 80wt% zirconia powder together to form a ceramic powder, then weigh 3wt% polyethylene glycol and dissolve it in an ethanol solution, stir and dissolve it fully, and pour it into The mixed ceramic powder is added, after being stirred at a high speed of 1500rpm in the mixer for 2 hours, the secondary granulation is carried out by spray drying method, and the spray dried powder is calcined at 900°C for 4h, and the heating rate is set at 10°C / min; then mix 11wt% of the binder polyvinylpyrrolidone and a certain amount of nitrogen methylpyrrolidone solution, and add the calcined ceramic powder after the dispersion is uniform, and after high-speed stirring, the ceramics are coated on the polyolefin micropores On the membrane, both sides are coated with a thickness of 10 μm respectively.

[0026] from figure 1 It can be seen that the crystal form of zirconia doped with 9wt% ceria is mostly tetragonal, that is, tetrago...

Embodiment 2

[0030] Preparation method: first mix 20wt% hafnium oxide powder and 75wt% zirconium oxide powder together to form a ceramic powder, then weigh 3wt% polyvinylpyrrolidone and dissolve it in ethanol solution, stir and dissolve fully, pour into it Add the mixed ceramic powder, after stirring at a high speed of 1200rpm for 2 hours, use the spray drying method for secondary granulation, and calcinate the spray-dried powder at 930°C for 4h, and set the heating rate to 10°C / min; Binder 3wt% styrene-butadiene rubber, 2wt% sodium carboxymethyl cellulose and a certain amount of nitrogen methyl pyrrolidone solution are mixed, after the dispersion is uniform, the calcined ceramic powder is added, after high-speed stirring, the ceramics are coated on On a polyolefin microporous membrane, coated on one side, with a thickness of 30 μm.

[0031] from Figure 4 It can be seen that most of the zirconia after 20wt% hafnium oxide doping is tetragonal zirconia t-ZrO 2 .

Embodiment 3

[0033] Preparation method: first mix 3wt% yttrium oxide powder and 95wt% zirconia powder together to form a ceramic powder, then weigh 0.3wt% polyethylene glycol and dissolve it in ethanol solution, stir and dissolve, Add the mixed ceramic powder into it, after 1300rpm high-speed stirring for 1.5h, secondary granulation by spray drying method, and calcine the spray-dried powder at 920°C for 4h, set the heating rate to 10°C / min ; Then mix 2wt% binder polyvinyl alcohol and a certain amount of nitrogen methyl pyrrolidone solution, add the calcined ceramic powder after the dispersion is uniform, and after high-speed stirring, the ceramic is coated on the polyolefin microporous membrane , coated on both sides, with a thickness of 0.2 μm, respectively.

[0034] from Figure 5 It can be seen that the zirconia doped with 3wt% yttria is all tetragonal zirconia.

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Abstract

The invention discloses a ceramic diaphragm and a preparation method and application thereof, and a battery comprising the ceramic diaphragm. The ceramic diaphragm comprises a base material and a ceramic coating compounded on at least one surface of the base material, wherein the ceramic coating is prepared from two or more ceramic powder and a binder; the ceramic powder comprises a main component tetragonal zirconia and a toughened component; the toughened component is one or two or more of cerium oxide, hafnium oxide and magnesium oxide; and the toughened component can be yttrium oxide. Due to the doped toughened component, zirconium oxide can exist in a metastable tetragonal phase at a room temperature, the prepared ceramic powder coats the membrane of taking a polyolefin microporous membrane as the base material, and the zirconium oxide in the tetragonal phase is mutated into zirconium oxide in a monoclinic phase during a sudden rise of the temperature or an impact of external force to absorb one part of energy, so that an effective flame-retardant effect can be achieved, and the stable temperature can be effectively ensured; and the preparation method of the ceramic membrane is simple in process and good in repeatability and has very high promotion and application values.

Description

technical field [0001] The invention relates to a ceramic diaphragm, its preparation method, application and a battery containing the diaphragm, belonging to the technical field of electrochemistry. Background technique [0002] A lithium-ion battery consists of a positive electrode, a negative electrode, an electrolyte, a separator, and packaging. The separator is located between the positive and negative electrodes of the lithium-ion battery, separating the positive and negative electrodes, avoiding direct contact between the positive and negative electrodes to cause local short circuits, and reducing safety issues such as battery defects and reliability caused by self-discharge. The commonly used lithium-ion battery diaphragm material is polyolefin diaphragm. The closed cell temperature of wet PE film is generally 120-130 °C, and the membrane rupture temperature is generally 140-150 °C; the closed cell temperature of dry process PP diaphragm is generally 150 °C. -160°C, ...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411H01M50/446H01M50/449Y02E60/10
Inventor 洪树韩翔龙许艳艳赵一博宋文峰
Owner JIANGSU CHUHAN ENERGY TECH CO LTD
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