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Ceramic diaphragm, lithium ion battery and preparation methods for ceramic diaphragm and lithium ion battery

A lithium-ion battery and ceramic diaphragm technology, which is applied in the field of lithium-ion batteries, can solve the problems of no effective suppression of combustion, large battery volume expansion, and closed pores, so as to achieve the effect of improving life expectancy, safety, and safety performance

Inactive Publication Date: 2017-05-17
OPTIMUM BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The inorganic insulating coating particles coated on the ceramic diaphragm are easy to block the pores of the diaphragm matrix due to their large particle size, resulting in closed pores, which is not conducive to the transmission of lithium ions and reduces the reactivity of the battery
[0006] 2. The adhesion between inorganic ceramic particles and the substrate is not good. In the winding process during the battery preparation process, due to the large tortuousness, the diaphragm is prone to creases, cracks, and inorganic particles fall off, causing internal short circuits in the battery, which in turn affects the battery. safety performance
[0007] 3. The separator commonly used in the prior art is made of polyolefin material. When an internal short circuit occurs in the battery, the heat generated inside cannot be effectively released, resulting in serious heat shrinkage of the separator, which aggravates the short circuit of the battery, causes the battery to explode, and seriously affects safety performance.
[0008] 4. When the battery has an internal short circuit, it is prone to serious heat accumulation and more gas, resulting in a large expansion of the battery volume. There is no substance inside the battery that can effectively inhibit combustion and reduce gas release, which is likely to cause battery explosion

Method used

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  • Ceramic diaphragm, lithium ion battery and preparation methods for ceramic diaphragm and lithium ion battery
  • Ceramic diaphragm, lithium ion battery and preparation methods for ceramic diaphragm and lithium ion battery
  • Ceramic diaphragm, lithium ion battery and preparation methods for ceramic diaphragm and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0056] 1. Negative electrode sheet preparation: use artificial graphite with a mass ratio of 96%, polyvinylidene fluoride and sodium carboxymethyl cellulose binder with a mass ratio of 2%, and 2% acetylene black as a conductive agent. With the same mass ratio of deionized water and styrene-butadiene rubber mixed solution, prepare the negative electrode sheet according to the general method in the industry;

[0057] 2. Weighing: take by weighing 50% triphenyl phosphate (boiling point 245 ° C, white crystals), 45% analytically pure nano-aluminum hydroxide (D 50 Particle size 4μm, specific surface area 5m 2 / g), the PVDF polyvinylidene fluoride (molecular weight 2,000,000 units) that mass ratio is 5%, joins in the stirred tank, takes by weighing and above-mentioned raw material (triphenyl phosphate, analytical pure nano aluminum hydroxide, polyvinylidene fluoride ) equal quality organic solvent NMP nitrogen methyl pyrrolidone, join in the above-mentioned stirred tank.

[0058] ...

Embodiment 2

[0063] The same steps as in Example 1 are used to prepare the slurry S2 and B2 for the ceramic diaphragm of the present example, the difference is that in step 2, the raw material is weighed: 50% cresyl diphenyl phosphate (boiling point : 255 ℃), mass ratio is 45% analytically pure nano-aluminum hydroxide, and mass ratio is 5% PVDF polyvinylidene fluoride, add in the stirred tank, take by weighing and above-mentioned raw material (diphenyl phosphoric acid, analytically pure nano-hydrogen Aluminum oxide, PVDF (polyvinylidene fluoride) equal quality organic solvent NMP nitrogen methyl pyrrolidone, join in the above-mentioned stirring tank.

Embodiment 3

[0065] The same steps as in Example 1 were used to prepare the slurries S3 and B3 for ceramic diaphragms of this example, the difference being that in step 2, the raw materials were weighed: 70% cresyl diphenyl phosphate was weighed, and the mass ratio was 70%. Ratio is 20% analytically pure nano-aluminum hydroxide, mass ratio is 10% PVDF polyvinylidene fluoride, add in the stirred tank, take by weighing and above-mentioned raw material (diphenyl phosphate cresyl ester, analytically pure nano-aluminum hydroxide, PVDF Polyvinylidene fluoride) equal quality organic solvent NMP nitrogen methyl pyrrolidone, join in the above-mentioned stirring tank.

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Abstract

The invention discloses ceramic diaphragm with high safety performance, a lithium ion battery and preparation methods for the ceramic diaphragm and lithium ion battery. The ceramic diaphragm comprises a diaphragm substrate and ceramic film coated outside of the diaphragm substrate. The diaphragm substrate comprises an inorganic filler, an organic binder and a hot-melt organism. The inorganic filler is selected from one or more of nano aluminium hydroxide, aluminium oxide, barium sulfate, magnesium hydroxide and calcium carbonate inorganic materials. The organic binder is selected from one or more of polyvinylidene fluoride, polytetrafluoroethylene and polyoxyethylene macromolecule materials. The hot-melt organism is selected from one or more of tri(beta-chloroethyl) phosphate, cresyl diphenyl phosphate, trioctyl phosphate, triphenyl phosphate, tricresyl phosphate, polydimethylsiloxane, organic silicones , polystyrene containing silicon copolymers, polyetherimide, bisphenol F polycarbonate, polyurethane and polymethyl methacrylate.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a ceramic diaphragm with high safety performance, a lithium ion battery and a method for manufacturing the ceramic diaphragm and the lithium ion battery. Background technique [0002] With the deterioration of the world's environmental problems and the increasing demand for clean and efficient energy for air quality, the country is vigorously developing the new energy vehicle industry, hybrid vehicles and pure electric vehicles and other new energy vehicles. At present, the main source of power for new energy vehicles on the market is Li-ion power battery. In order to meet the long-distance battery life requirements of new energy vehicles, power battery manufacturers generally use high-capacity materials to make power batteries, thereby improving the battery life of electric vehicles. [0003] Existing large-capacity power batteries generally use nickel...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M10/0587
CPCH01M10/0525H01M10/0587H01M2220/20H01M50/403H01M50/446H01M50/449Y02E60/10Y02P70/50
Inventor 马维克
Owner OPTIMUM BATTERY CO LTD
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