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

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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 orig

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
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Example Embodiment

[0052] Example 1. Aluminum oxide fiber composite diaphragm S1

[0053] 1) Preparation of fiber rod material:

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

[0055] 2) Preparation of composite diaphragm:

[0056...

Example Embodiment

[0057] Example 2. Zirconia fiber composite diaphragm S2

[0058] 1) Preparation of fiber rod material:

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

[0060] 2) Preparation of composite diaphragm:

[0061] Weigh ...

Example Embodiment

[0062] Example 3: Natural mineral fiber composite diaphragm S3

[0063] 1) Preparation of fiber rod material:

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

[0065] 2) Preparation of composite diaphragm:

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

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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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