Ceramic diaphragm and application of same to lithium ion battery

A technology of ceramic diaphragm and secondary battery, applied in the field of electrochemistry, can solve the problems of affecting the performance of ceramic diaphragm, poor uniformity, powder drop, etc.

Inactive Publication Date: 2013-08-07
XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large specific surface energy of ceramic powder, it is easy to agglomerate, and its surface is generally hydrophilic, while the polyolefin film is a hydrophobic material. Therefore, according to research reports, the uniformity of ceramic powder coating is poor , there is an obvious "powder dropping" phenomenon, which will greatly affect the performance of ceramic separators in lithium-ion batteries

Method used

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  • Ceramic diaphragm and application of same to lithium ion battery
  • Ceramic diaphragm and application of same to lithium ion battery
  • Ceramic diaphragm and application of same to lithium ion battery

Examples

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Embodiment 1

[0081] Using silica nanowires with a number-average diameter of 10 nanometers, a number-average length of about 2 microns, and an aspect ratio of about 200:1 as powder, polymethyl methacrylate as a binder is dispersed in acetone. After dispersing for 10 hours under the condition of mechanical stirring, one-side coating was carried out on the polyethylene microporous diaphragm by casting method, and dried under vacuum condition at room temperature. The scanning electron micrographs of the obtained ceramic separator are as follows: figure 2 As shown, it can be seen from the figure that the silica nanowires are uniformly coated on the surface of the polyethylene microporous membrane.

Embodiment 2

[0083] Titanium dioxide nanotubes with a number-average diameter of 5 nanometers, a number-average length of 10 microns, and an aspect ratio of 2000:1 are used as powder, and polyvinylidene fluoride is used as a binder to disperse in N-methylpyrrolidone. After dispersing for 5 hours, double-sided coating was carried out on the polyethylene diaphragm on a GTB780 type coater at a speed of 2 m / min, and a ceramic diaphragm was obtained after drying.

Embodiment 3

[0085] Aluminum oxide nanorods with a number-average diameter of 50 nanometers, a number-average length of 1 micron, and an aspect ratio of 20:1 were used as powder, and polyvinylidene fluoride was used as a binder to disperse in dimethylformamide. After dispersing for 5 hours under mechanical stirring conditions, double-sided coating was carried out on the vinylidene fluoride-hexafluoropropylene copolymer film on a GTB780 type coater at a speed of 2 m / min, and a ceramic separator was obtained after drying.

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Abstract

The invention belongs to the field of electrochemistry and particularly relates to a ceramic diaphragm. More particularly, the invention relates to the ceramic diaphragm prepared from an inorganic matter with a nano structure and with a certain length-diameter ratio as a ceramic powder body. The invention also relates to an application of the ceramic diaphragm to chemical power supply systems such as a lithium ion battery. The ceramic diaphragm disclosed by the invention can be used as a high-safety diaphragm material of secondary batteries such as a lithium ion secondary battery, and has the electrochemical performance and the heat stability. The ceramic diaphragm is high in operability, lower in cost in comparison with other methods, good in reproducibility and stable in product quality.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a ceramic diaphragm. More specifically, the present invention relates to a ceramic diaphragm prepared by using a nanostructured inorganic material with a certain aspect ratio as a ceramic powder. The present invention also relates to the application of the ceramic diaphragm in chemical power systems such as lithium-ion batteries. Background technique [0002] As a chemical power 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] In lithium-ion batteries, the separator mainly plays ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16B82Y30/00
CPCY02E60/12Y02E60/10
Inventor 赵金保张鹏陈丽肖
Owner XIAMEN UNIV
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