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Composite porous membrane material filled with silicon nitride particles and its preparation method and application

A membrane material, curved hole technology, used in textiles and papermaking, fiber processing, electrical components, etc., can solve the problems of high porosity, micro-short circuit, low battery charge retention rate, etc., and achieve the effect of resisting mechanical impact

Active Publication Date: 2017-07-11
JIANGXI ADVANCED NANOFIBER S&T CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since this electrospun nanofiber separator is a non-woven fabric stacked by fibers, it has too high porosity and too large surface pore size, resulting in a low charge retention rate of the battery and frequent micro-short circuits. Especially when the thickness of the battery separator is low, such as below 30 microns, the probability of this situation is quite high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] a Si containing 3 N 4 Nanoparticle composite membrane material, which is based on electrospun polyimide (PI) nanofiber non-woven fabric, and the pores of the substrate are filled with Si 3 N 4 Nanoparticles (Si 3 N 4 -NP);

[0037] Its preparation method is as follows:

[0038] (1) Nano Si 3 N 4 water-based suspension (Si 3 N 4 / H 2 Configuration of O-1): Nano silicon nitride powder (mainly distributed at 30nm in diameter) 80.0g, ammonium polyacrylate 1.0g, butyl acrylate-isooctyl acrylate copolymer 8.0g, distilled water 300.0g, put into a beaker at one time , emulsified at 8000 rpm to form a nano-silicon nitride water-based suspension (SiN) with an absolute viscosity of 28 mPa·S. 3 N 4 / H 2 O-1).

[0039] (2) Si 3 N 4 Preparation of / PI nanocomposite high temperature resistant and high safety battery separator: the above-configured Si 3 N 4 / H 2 O-1 silicon nitride water-based suspension was flattened on a glass plate to form a suspension film with a...

Embodiment 2

[0042] a Si containing 3 N 4 Nanoparticle composite membrane material, which is based on electrospun polyimide (PI) nanofiber non-woven fabric, and the pores of the substrate are filled with Si 3 N 4 Nanoparticles (Si 3 N 4 -NP);

[0043] Its preparation method is as follows:

[0044] (1) Nano Si 3 N 4 water-based suspension (Si 3 N 4 / H 2 O-2) configuration: silicon nitride powder (mainly distributed at 100nm in diameter) 80.0g, ammonium polyacrylate 0.5g, butyl acrylate-isooctyl acrylate copolymer 8.0g, distilled water 433.0g, put into a beaker at one time , emulsified at 8000 rpm to form a nano-silicon nitride water-based suspension with an absolute viscosity of 19 mPa·S (Si 3 N 4 / H 2 O-2).

[0045] (2) Si 3 N 4 Preparation of / PI micro-nano composite high-temperature and high-safety battery separator: the above-configured Si 3 N 4 / H 2 O-2 silicon nitride water-based suspension was flattened on a glass plate to form a suspension film with a thickness of...

Embodiment 3

[0048] a Si containing 3 N 4 Nanoparticle composite membrane material, which is based on electrospun polyimide (PI) nanofiber non-woven fabric, and the pores of the substrate are filled with Si 3 N 4 Nanoparticles (Si 3 N 4 -NP);

[0049] Its preparation method is as follows:

[0050] (1) Nano Si 3 N 4 water-based suspension (Si 3 N 4 / H 2 O-3) Configuration: silicon nitride powder (diameter mainly distributed at 50nm) 80.0g, ammonium polyacrylate 0.7g, butyl acrylate-isooctyl acrylate copolymer 8.0g, distilled water 300.0g, put into a beaker at one time , emulsified at 8000 rpm to form a micron silicon nitride water-based suspension (Si 3 N 4 / H 2 O-3).

[0051] (2) Si 3 N 4 Preparation of / PI nanocomposite high temperature resistant and high safety battery separator: the above-configured Si 3 N 4 / H 2 O-3 silicon nitride water-based suspension was flattened on a glass plate to form a suspension film with a thickness of 50 μm, and then electrospun PI nanofi...

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Abstract

The invention discloses a nanocomposite multi-porous membrane material, which uses polyimide (PI) nanofiber non-woven fabric as a base material, and the pores of the base material are filled with nano-silicon nitride particles; the nano-nitride Silicon particles, whose diameter is between 50-100nm, accounts for 30-60% of the total weight of the nanocomposite multi-porous membrane material; the thickness of the PI nanofiber nonwoven fabric is between 9-38 μm, and the porosity is between 60-38 μm. Between 80%. The nanocomposite multi-porous membrane material provided by the invention is resistant to high temperature, heat shrinkage, high voltage and high current impact, and mechanical impact, and is suitable for use as a safe battery diaphragm and a safe supercapacitor diaphragm to manufacture various high-capacity and high-capacity Power lithium battery or super capacitor. The invention also provides a preparation method of the nanocomposite porous membrane material and its application as a battery diaphragm.

Description

technical field [0001] The invention belongs to the field of battery separators, relates to a porous membrane material, in particular to a 3 N 4 A composite porous membrane material of nanoparticles, a preparation method thereof, and an application as a battery separator. Background technique [0002] As the power battery of new energy vehicles, lithium-ion batteries have been developed rapidly and will become an indispensable daily necessities for human beings. However, since the currently used lithium battery separator is a polyolefin porous membrane material with poor temperature resistance, at a higher temperature, or in the case of overcharging, overdischarging and mechanical damage, lithium-ion batteries are prone to smoke, Fire, even explosion and other hidden dangers that endanger the safety of users. Therefore, improving the safety of lithium-ion batteries is the key to promoting the application of lithium-ion batteries in automotive power and other fields. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16D06M101/30H01M50/403H01M50/44H01M50/491
CPCY02E60/10
Inventor 侯豪情王琦周小平程楚云何云云
Owner JIANGXI ADVANCED NANOFIBER S&T CO LTD
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