Ceramic coating diaphragm, preparation method thereof and application

A technology of ceramic coating and diaphragm, applied in nanotechnology, nanotechnology, electrical components, etc. for materials and surface science, to achieve good ionic conductivity and mechanical properties, strong operability, and improved safety performance

Inactive Publication Date: 2017-06-13
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the ceramic powder used in general ceramic-coated diaphragms is mainly inorganic oxides, and the good heat resistance of inorganic oxides is mainly used. Therefore, the improvement of the thermal stability of this type of ceramic diaphragm is only A "passive" defense

Method used

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  • Ceramic coating diaphragm, preparation method thereof and application
  • Ceramic coating diaphragm, preparation method thereof and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] BN nanowires with a diameter of 10nm and a length of 1-2μm are used as powder, and polymethyl methacrylate is used as a binder to disperse in acetone. One-sided coating was carried out on the separator, and it was dried under vacuum at room temperature. The scanning electron micrographs of the obtained ceramic separator are as follows: figure 1 As shown, it can be seen from the figure that the BN nanowires are evenly coated on the surface of the polypropylene microporous membrane.

Embodiment 2

[0041] BN nanotubes with a diameter of 5nm and a length of 10μm are used as powder, and polyvinylidene fluoride is used as a binder to disperse in N-methylpyrrolidone. The speed of min is double-sided coating on the polyethylene diaphragm, and the ceramic diaphragm is obtained after drying.

Embodiment 3

[0043] Nanoparticles with a particle size of 50nm are used as powder, and polyvinylidene fluoride is used as a binder to disperse in dimethylformamide. After dispersing for 5 hours under mechanical stirring conditions, the coating machine is coated with a GTB780 at a speed of 2m / min. Double-sided coating is carried out on the vinylidene fluoride-hexafluoropropylene copolymer membrane, and a ceramic diaphragm is obtained after drying.

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Abstract

The invention discloses a ceramic coating diaphragm, a preparation method thereof and an application, and relates to a lithium-ion battery separator. The ceramic coating diaphragm comprises a polymer diaphragm; one side or both sides of the polymer diaphragm is / are coated with a high heat conduction insulation nano-material. The high heat conduction insulation nano-material adopts a BN nano-wire, a BN nano-particle, and a BN nano-tube, and others; the preparation method includes steps of adding high heat conduction insulation nano-material in the polymer solution, and then coating to the polymer diaphragm; after volatilizing the solvent, acquiring the solid polymer membrane, namely, ceramic coating diaphragm. The ceramic coating diaphragm can be applied to the lithium ion secondary battery. The prepared ceramic diaphragm with high heat conductivity can be used as the ceramic coating diaphragm of the lithium ion secondary battery, thereby improving the safety performance of the lithium ion battery; the ceramic coating diaphragm has very good ionic conductivity and mechanical performance. The operability is strong.

Description

technical field [0001] The invention relates to a lithium-ion battery diaphragm, in particular to a ceramic coating diaphragm and its preparation method and application. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, high specific power, good cycle performance, no memory effect, and no pollution. They have good economic benefits, social benefits, and strategic significance. They have become the most eye-catching green chemical power sources. [0003] In lithium-ion batteries, the separator mainly plays the role of preventing positive and negative electrodes from contacting and allowing ion conduction, and is an important part of the battery. At present, commercial lithium-ion batteries mainly use polyolefin diaphragm materials with microporous structures, such as single-layer or multi-layer films of polyethylene (Polyethylene, PE) and polypropylene (Polypropylene, PP). Due to the characteristics of the polymer itself, al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M10/42B82Y30/00B82Y40/00H01M50/403H01M50/431H01M50/443H01M50/457H01M50/489
CPCH01M10/0525H01M10/4235B82Y30/00B82Y40/00H01M50/431H01M50/403H01M50/411Y02E60/10
Inventor 赵金保张鹏王静
Owner XIAMEN UNIV
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