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High-stability lithium ion battery diaphragm, preparation method thereof and lithium ion battery

A lithium-ion battery, high-stability technology, used in secondary batteries, battery pack components, circuits, etc., can solve problems such as affecting battery life, low melting point, and battery combustion and explosion

Active Publication Date: 2017-11-10
WINNERWAY MOTORS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polymer separator is light in weight and has good electronic insulation performance. The disadvantage is that the polymer generally has a low melting point. When the battery is thermally abused, the separator will be near the melting temperature, and the size of the separator will also shrink, and holes will appear. The life of the battery is limited, and in serious cases, battery combustion and explosion accidents will occur

Method used

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  • High-stability lithium ion battery diaphragm, preparation method thereof and lithium ion battery
  • High-stability lithium ion battery diaphragm, preparation method thereof and lithium ion battery
  • High-stability lithium ion battery diaphragm, preparation method thereof and lithium ion battery

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preparation example Construction

[0033] A method for preparing a high-stability lithium ion battery diaphragm includes the following steps:

[0034] (1) Ultrasonic dispersion of ceramic particles A and ceramic particles B in the dispersant uniformly, and then adding fibers and binders to ultrasonic dispersion to obtain ceramic slurry;

[0035] (2) Coating the ceramic slurry on the surface of the polymer matrix and then drying to obtain diaphragm A;

[0036] (3) Soak the separator A in an alkaline solution for 3-24 hours to obtain a lithium ion battery separator.

[0037] According to the present invention, the preparation method of the high-stability lithium ion battery separator further includes pretreatment of the fiber, and the pretreatment step includes soaking the fiber in a non-acidic solution for 2-24 hours, washing, sonicating, and filtering to obtain For the swelling fiber, it is further preferred that the diameter of the fiber is 5-20 nm and the length is 20-200 nm.

[0038] According to the present inventio...

Embodiment 1

[0046] A lithium ion battery is composed of a positive electrode, a negative electrode and a separator. The preparation method is as follows:

[0047] (1) Preparation of positive electrode

[0048] 100 parts by weight of LiNi 0.33 Co 0.33 Mn 0.34 O 2 , 4 parts by weight of polyvinylidene fluoride (PVDF) and 4 parts by weight of acetylene black are added to 50 parts by weight of N-methylpyrrolidone (NMP), and then stirred in a vacuum mixer to form a uniform positive electrode slurry; It is evenly coated on an aluminum foil with a width of 400mm and a thickness of 20μm, then dried at 120°C, rolled under a pressure of 1.6MPa, and then slit on a slitter to obtain a positive electrode with a size of 385mm×42mm×135μm.

[0049] (2) Preparation of negative electrode

[0050] Add 100 parts by weight of negative active material natural graphite, 4 parts by weight of polytetrafluoroethylene (PTFE), and 4 parts by weight of carbon black to 45 parts by weight of dimethyl sulfoxide (DMSO), and then...

Embodiment 2

[0059] A lithium ion battery is composed of a positive electrode, a negative electrode and a separator. The preparation method is as follows:

[0060] (1) The preparation method of the positive electrode is the same as in Example 1;

[0061] (2) The preparation method of the negative electrode is the same as in Example 1;

[0062] (3) Preparation of diaphragm:

[0063] Soak 2.2 parts by weight of ramie fibers in 1M potassium hydroxide (40°C) solution for 2h, then filter to remove the filtrate, wash the filter residue with water to neutrality, then ultrasonically disperse for 30min, filter to obtain swollen cellulose (diameter 10nm, length 200nm);

[0064] 17.6 parts by weight of zinc oxide (average particle size of 150nm), 24.3 parts by weight of zinc oxide (average particle size of 30nm) were uniformly dispersed in 44 parts by weight of polyvinylpyrrolidone ultrasonically, and then swollen fibers and 0.2 parts by weight of polyimide were added. Silk (average diameter of 100nm), 1 par...

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Abstract

The invention relates to the technical field of a lithium ion battery and discloses a high-stability lithium ion battery diaphragm, a preparation method thereof and the lithium ion battery. The high-stability lithium ion battery diaphragm comprises a polymer substrate and ceramic film coated on the surface of the polymer substrate. The ceramic film is prepared by ceramic slurry. The ceramic slurry comprises dispersant, adhesive and powder. The power comprises the following substances of ceramic particles and fibers. The ceramic particles comprise ceramic particles A with a particle size range of 80nm-200nm and the ceramic particles B with the particle size range of 10nm-50nm. The high-stability lithium ion battery diaphragm provided by the invention has excellent absorption and electrolyte holding capability; a hot-shrinkage rate of the diaphragm at the high temperature can be reduced; and the stability and service life of the battery can be improved.

Description

Technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-stability lithium ion battery diaphragm, a preparation method thereof, and a lithium ion battery. Background technique [0002] In recent years, with the exhaustion of the earth's resources and the increasing awareness of social environmental protection, green and clean energy has become an important direction in the field of energy storage and energy conversion. As a basic energy storage and conversion device, chemical power has become an indispensable part of production and life. With the rapid development of portable electronic devices today, the demand for rechargeable chemical power sources is extremely urgent. Compared with the traditional secondary batteries such as nickel-cadmium and lead-acid batteries, lithium-ion batteries have the characteristics of high energy density, long life and no pollution to the environment, and have been widely used as power ...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/434H01M50/44H01M50/443H01M50/449H01M50/489
CPCH01M10/0525H01M50/411H01M50/44H01M50/403Y02E60/10
Inventor 李娜梁卫刚钟楚平孟庆石王晶
Owner WINNERWAY MOTORS CO LTD
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