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Separation membrane and preparation method thereof, and lithium ion battery using the separation membrane

A separator and polymer technology, applied in the field of separators with good cycle and safety performance and their preparation, can solve the problem of difficulty in ensuring long-term coating thickness uniformity, affecting battery cycle and rate performance, slitting knives and coating rollers problems such as large loss, to achieve the effect of improving the rate and cycle performance, easy to realize industrial production, and reducing the cost of slurry and equipment

Active Publication Date: 2015-11-25
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it should be pointed out that although the ceramic coated separator can improve the thermal stability and safety performance of the battery, it also affects the cycle and rate performance of the battery; The loss of slitting knife and coating roller is very large, and it is usually difficult to ensure the uniformity of coating thickness for a long time; moreover, the price of ceramic slurry is relatively high, which is not conducive to reducing costs

Method used

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  • Separation membrane and preparation method thereof, and lithium ion battery using the separation membrane
  • Separation membrane and preparation method thereof, and lithium ion battery using the separation membrane
  • Separation membrane and preparation method thereof, and lithium ion battery using the separation membrane

Examples

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Effect test

Embodiment 1

[0036] The preparation steps of the diaphragm of this embodiment are:

[0037]1) Add ultra-fine glass fibers with an average diameter of 1000nm to a polyethylene wax emulsion with a solid content of 25% in a mass ratio of 1:10 (the average particle size of polyethylene wax is 0.5 μm, the melting point is 105 ° C, the molecular weight 5000, the solvent is deionized water), stirred and immersed for 60 minutes, filtered and dried to obtain ultra-fine glass fibers with a polyethylene wax coating thickness of 2 μm;

[0038] 2) Add water and water-soluble sodium carboxymethylcellulose into the stirring grinder at a mass ratio of 98.5:1.5 to completely dissolve the sodium carboxymethylcellulose to obtain an aqueous solution of sodium carboxymethylcellulose;

[0039] 3) Add the ultra-fine glass fiber coated with polyethylene wax into the sodium carboxymethyl cellulose aqueous solution in proportion, and obtain the primary slurry after stirring;

[0040] 4) Add styrene-acrylic latex t...

Embodiment 2

[0044] The preparation steps of the diaphragm of this embodiment are:

[0045] 1) Add ultra-fine glass fibers with an average diameter of 500nm to polyethylene wax emulsion with a solid content of 30% in a mass ratio of 1:20 (the average particle size of polyethylene wax is 0.5μm, the melting point is 110°C, and the molecular weight 8000, the solvent is deionized water), stirred and soaked for 60 minutes, filtered and dried to obtain ultrafine glass fibers with a polyethylene wax coating thickness of 1 μm;

[0046] 2) Add water and water-soluble carboxyethyl cellulose to the stirring grinder at a mass ratio of 98.5:1.5 to completely dissolve the sodium carboxymethyl cellulose to obtain an aqueous solution of sodium carboxymethyl cellulose;

[0047] 3) Add the ultra-fine glass fiber coated with polyethylene wax into the sodium carboxymethyl cellulose aqueous solution in proportion, and obtain the primary slurry after stirring;

[0048] 4) Add styrene-acrylic latex to the prima...

Embodiment 3

[0052] The preparation steps of the diaphragm of this embodiment are:

[0053] 1) Add ultra-fine glass fibers with an average diameter of 500nm to a polypropylene wax emulsion with a solid content of 25% in a mass ratio of 1:20 (the average particle size of polypropylene wax is 1 μm, the melting point is 120°C, and the molecular weight is 8000, the solvent is deionized water), stirred and soaked for 60 minutes, filtered and dried to obtain ultra-fine glass fibers with a polypropylene wax coating thickness of 1 μm;

[0054] 2) Add water and water-soluble sodium carboxymethylcellulose into the stirring grinder at a mass ratio of 98.5:1.5 to completely dissolve the sodium carboxymethylcellulose to obtain an aqueous solution of sodium carboxymethylcellulose;

[0055] 3) Add the ultra-fine glass fiber coated with polypropylene wax into the sodium carboxymethyl cellulose aqueous solution in proportion, and obtain the primary slurry after stirring;

[0056] 4) Add styrene-acrylic la...

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Abstract

The present invention discloses a separation membrane and a preparation method thereof, and a lithium ion battery using the separation membrane. The separation membrane comprises a porous separation membrane substrate and a composite coating coated on at least a surface of the separation membrane substrate, wherein the composite coating comprises a polymer wax coated and modified ultra-fine glass fibers and an aqueous emulsion, and the melting point of the polymer wax for coating the ultra-fine glass fibers is 80-160 DEG C. The preparation method is used for preparing the separation membrane. Compared with the separation membrane in the prior art, the separation membrane of the present invention has advantages of high thermal stability, strong mechanical property, strong liquid absorbent ability, good safety and the like, such that the cycle performance and the safety of the lithium ion battery can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, more specifically, the invention relates to a diaphragm with good cycle and safety performance and a preparation method thereof. Background technique [0002] As a type of chemical battery with the characteristics of high energy density, high working voltage, no memory effect and long cycle life, lithium-ion batteries have gradually moved from batteries used in mobile phones, notebook computers, digital cameras and portable small appliances to electric vehicles, storage batteries, etc. Batteries used in energy and transportation fields such as power stations. With the widening of the application field of lithium-ion batteries, more and more attention has been paid to its price, cost, safety performance and cycle life. [0003] Lithium-ion battery separator (LIBS) is an important part of the battery except for the positive electrode material, negative electrode material and electrol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525H01M50/411H01M50/449H01M50/491
CPCY02E60/10
Inventor 占克军赖旭伦杨建瑞牛磊江辉
Owner CONTEMPORARY AMPEREX TECH CO
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