Composite diaphragm material and preparation method and application thereof

A composite diaphragm and film layer technology, applied in the field of materials, can solve problems such as easy clogging, loss of battery capacity and cycle life, and achieve low cost, improved battery capacity and cycle life, and high process stability.

Inactive Publication Date: 2015-03-11
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the shape of the ceramic particles is close to spherical, the particles and the binder are more likely to block the pores in the original polyolefin separator, thus blocking the conduction channel of lithium ions, resulting in a significant loss of battery capacity and cycle life.

Method used

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  • Composite diaphragm material and preparation method and application thereof
  • Composite diaphragm material and preparation method and application thereof
  • Composite diaphragm material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Embodiment 1, Al2O3 fiber composite diaphragm S1

[0053] 1) Preparation of fiber rod material:

[0054] Dissolve 2.0g of aluminum nitrate in 20g of deionized water, then add 20g of polyvinyl alcohol aqueous solution with a concentration of 10% by mass, and stir thoroughly to obtain a precursor solution; add the above precursor solution into the syringe of the electrospinning equipment, The precursor composite fiber was obtained by electrospinning (spinning conditions: spinning voltage 30KV, extrusion speed 2.0ml / min). After repeating the above experiments several times, multiple precursor composite fibers were obtained. All the composite fibers were removed from the receiving plate, calcined in a medium-temperature furnace at 1000°C for 10 hours, and the aluminum oxide fibers collected were 50.5 g in total. The average length of the aluminum oxide fiber rod-shaped materials was 0.5 microns, and the 50 nanometers in diameter.

[0055] 2) Preparation of composite diap...

Embodiment 2

[0057] Embodiment 2, zirconia fiber composite diaphragm S2

[0058] 1) Preparation of fiber rod material:

[0059] Dissolve 2.0g of zirconium oxynitrate in 20g of deionized water, then add 20g of polyvinyl alcohol aqueous solution with a mass fraction of 10%, and stir thoroughly to obtain a precursor solution; add the above precursor solution into the syringe of the electrospinning equipment, and pass Electrospinning method to obtain precursor composite fiber (spinning conditions: spinning voltage 30KV, extrusion speed 2.0ml / min). After repeating the above experiments several times, multiple precursor composite fibers were obtained. All the composite fibers were removed from the receiving plate, calcined in a medium-temperature furnace at 1000° C. for 10 hours, and a total of 38.76 g of zirconium dioxide fibers were collected. The average length of the zirconia fiber rod-shaped material is 1.5 micrometers, and the average diameter is 300 nanometers.

[0060] 2) Preparation ...

Embodiment 3

[0062] Embodiment 3, natural mineral fiber composite diaphragm S3

[0063] 1) Preparation of fiber rod material:

[0064] Purified attapulgite clay fiber powder with a purity of 98% (purchased from Jiangsu Jiuchuan Nano Material Technology Co., Ltd.) was vacuum-dried to remove interlayer hydrates of attapulgite clay to obtain fiber rod-shaped materials. The average length of the fibrous rod-shaped material is 1 micrometer, and the average diameter is 50 nanometers.

[0065] 2) Preparation of composite diaphragm:

[0066] Weigh 500.0g of the obtained fiber rod-shaped material of step 1), 15.0g of the adhesive styrene-butadiene latex, and 10.0g of the dispersing agent polyethylene glycol (weight-average molecular weight is 4000), dissolve in 700g of water, and mix by high-speed stirring. In order to speed up the dispersing speed, ultrasonic assisted rapid dispersing is used. The obtained solution is coated on a commercial PE film with a thickness of 20 microns (the porous pol...

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Abstract

The invention discloses a composite diaphragm material and a preparation method and application thereof. The composite diaphragm material comprises an inorganic layer and a porous polymeric membrane layer, wherein the inorganic layer is positioned on one side or two sides of the porous polymeric membrane layer; the inorganic layer is connected with the porous polymeric membrane layer through adhesive; the inorganic layer is made of fiber rod-like materials; the fiber rod-like materials are mutually stacked to form a plurality of pores with the average pore diameter of 0.05-1 micron; the porous polymeric membrane layer has the average pore diameter of 0.05-0.5 micron and the porosity of 30-60%. The composite diaphragm material can be used as a diaphragm of a secondary lithium ion battery; the lithium ion battery using the diaphragm material provided by the invention has excellent electrochemical performance and safety.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a composite diaphragm material and a preparation method and application thereof. Background technique [0002] Lithium-ion secondary batteries are currently widely used as mobile power sources for electronic devices due to their high energy density, long life, and environmental friendliness of their constituent materials, and are generally recognized by the industry as a promising option for future new energy vehicles. Energy carrier has very broad application prospects and economic value. In recent years, my country's lithium-ion battery industry has achieved great development. In 2013, its production capacity accounted for 30% of the global market, ranking second in the world. With the expansion of the application of emerging new energy power and energy storage fields such as new energy vehicles, communication base stations, and new energy power stations, the demand for lithium-ion batt...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/403H01M50/431H01M50/44H01M50/449H01M50/489H01M50/497
CPCH01M10/0525H01M50/431H01M50/44H01M50/403H01M50/449Y02E60/10
Inventor 李峥冯玉川南策文
Owner TSINGHUA UNIV
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