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Enhancement-type inorganic diaphragm for lithium ion battery and preparation method of enhancement-type inorganic diaphragm

A lithium-ion battery, inorganic separator technology, applied in secondary batteries, battery pack parts, separators/films/diaphragms/spacers, etc., can solve the problem of lack of mechanical strength and flexibility, poor adhesion of inorganic particles , Unable to meet the requirements of lithium-ion battery assembly and use, to achieve the effect of improving mechanical strength and flexibility, high flexibility, excellent electrolyte wettability and high temperature dimensional stability

Inactive Publication Date: 2016-05-11
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the bonding between inorganic particles is poor, and they do not have sufficient mechanical strength and flexibility to meet the requirements of lithium-ion battery assembly and use.

Method used

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  • Enhancement-type inorganic diaphragm for lithium ion battery and preparation method of enhancement-type inorganic diaphragm
  • Enhancement-type inorganic diaphragm for lithium ion battery and preparation method of enhancement-type inorganic diaphragm
  • Enhancement-type inorganic diaphragm for lithium ion battery and preparation method of enhancement-type inorganic diaphragm

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Embodiment 1～3

[0036] Polyvinylidene fluoride (PVDF), polyacrylonitrile (PAN) and their mixture (PVDF / PAN) with a mass ratio of 1:1 were dissolved in N,N-dimethylformamide at 80 °C to obtain spinning The mass of the polymer in the spinning solution is 22 parts, and the solvent is 78 parts.

[0037] The above spinning solution was electrospun to prepare polymer nanofibers; the spinning voltage was 15kV.

[0038] Disperse 0.4 parts by mass of nano-silica in 99.6 parts by mass of acetone, and add 0.04 parts by mass of polyvinylidene fluoride as a binder to prepare a nano-silica suspension, ultrasonically treated for 10min .

[0039] The nano-silica suspension is infiltrated into the polymer nanofibers by means of vacuum filtration, and the mass ratio of the nano-silica suspension to the polymer nanofibers is 500, thus obtaining a reinforced inorganic diaphragm.

[0040] After drying, the reinforced inorganic diaphragm was prepared into a dumbbell-shaped sample, and the tensile strength and el...

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Abstract

The invention discloses an enhancement-type inorganic diaphragm for a lithium ion battery and a preparation method of the enhancement-type inorganic diaphragm. According to the enhancement-type inorganic diaphragm, inorganic particles are used as a matrix, and high-molecular nanofibers penetrate through the inorganic particle matrix to form an enhancement phase. The enhancement-type inorganic diaphragm is prepared by that an inorganic particle suspension liquid permeates among the high-molecular nanofibers. The enhancement-type inorganic diaphragm prepared by virtue of the preparation method contains a large amount of inorganic particles (more than 65 parts by weight), and the advantages of the inorganic particles are adequately exerted, so that the enhancement-type inorganic diaphragm has excellent electrolyte wettability and high-temperature stability, and the electrochemical performance and the use safety of the lithium ion battery are greatly improved. Meanwhile, by virtue of the high-molecular nanofibers, the enhancement-type inorganic diaphragm has relatively good mechanical strength and flexibility and can meet use and assembling requirements of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and particularly relates to an enhanced inorganic separator for lithium ion batteries and a preparation method thereof. Background technique [0002] The separator is an important component in lithium-ion batteries, and its role is to separate the positive and negative electrodes to prevent short circuits. In order to meet the requirements of high-performance lithium-ion batteries, the separator should at least have the following characteristics: 1) good electrolyte wettability and high liquid absorption rate, 2) excellent high temperature dimensional stability. The currently commonly used polyolefin-based microporous separator cannot meet the above characteristics, and the obtained lithium ion battery has poor performance. Electrospinning refers to a spinning technique in which a polymer solution or melt is drawn into fibers under the action of an electrostatic field. The diamete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/40H01M50/403H01M50/431
CPCH01M10/0525H01M50/40H01M50/403H01M50/409H01M50/431Y02E60/10
Inventor 吕瑞华那兵柳和生
Owner EAST CHINA UNIV OF TECH
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