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Composite multi-arc-hole membrane material filled with boric nitride particles as well as preparation method and application thereof

A membrane material and curved hole technology, applied in the field of porous membrane materials and composite multi-porous membrane materials, can solve the problems of low battery charge retention, large surface pore size, high porosity, etc., and achieve excellent mechanical properties, surface pore size Small, high heat resistance effect

Active Publication Date: 2015-12-30
JIANGXI NORMAL UNIV
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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 composite membrane material containing BN nanoparticles, which uses electrospun polyimide (PI) nanofiber nonwoven fabric as the substrate, and the pores of the substrate are filled with BN nanoparticles (BN-NP);

[0037] The preparation method is as follows:

[0038] (1) Nano BN water-based suspension (BN / H 2 O-1) Configuration: 80.0 grams of nano boron nitride powder (mainly distributed in diameter of 30nm), 1.0 grams of ammonium polyacrylate, 8.0 grams of polybutyl acrylate-isooctyl ester, 300.0 grams of distilled water, put them in a beaker at once, Emulsify at a speed of 8000 revolutions per minute to form a nano-BN water-based suspension with an absolute viscosity of 27mPa·S (BN / H 2 O-1).

[0039] (2) Preparation of BN / PI nanocomposite high temperature and high safety battery separator: the BN / H 2 O-1 Boron Nitride water-based suspension was spread on the glass plate to form a suspension film with a thickness of 30μm, and then the electrospun PI nanofiber nonwoven fabri...

Embodiment 2

[0042] A composite membrane material containing BN nanoparticles, which uses electrospun polyimide (PI) nanofiber nonwoven fabric as the substrate, and the pores of the substrate are filled with BN nanoparticles (BN-NP);

[0043] The preparation method is as follows:

[0044] (1) Nano BN water-based suspension (BN / H 2 O-2) Configuration: 80.0 grams of nano boron nitride powder (mainly distributed in diameter of 100nm), 0.5 grams of ammonium polyacrylate, 8.0 grams of polybutyl acrylate-isooctyl ester, 433.0 grams of distilled water, put them in a beaker at once, Emulsify at a speed of 8000 revolutions per minute to form a water-based suspension of nano-boron nitride with an absolute viscosity of 18mPa·S (BN / H 2 O-2).

[0045] (2) Preparation of BN / PI nanocomposite high temperature and high safety battery separator: the BN / H 2 The O-2 boron nitride water-based suspension is spread on the glass plate to form a suspension film with a thickness of 60μm, and then the electrospun PI nanofi...

Embodiment 3

[0048] A composite membrane material containing BN nanoparticles, which uses electrospun polyimide (PI) nanofiber nonwoven fabric as the substrate, and the pores of the substrate are filled with BN nanoparticles (BN-NP);

[0049] The preparation method is as follows:

[0050] (1) Nano BN water-based suspension (BN / H 2 O-3) Configuration: 80.0 grams of nano boron nitride powder (mainly distributed in diameter of 50nm), 0.8 grams of ammonium polyacrylate, 8.0 grams of polybutyl acrylate-isooctyl ester, 300.0 grams of distilled water, put them in a beaker at once, Emulsify at 8000 revolutions per minute to form a micron boron nitride water-based suspension with an absolute viscosity of 24mPa·S (BN / H 2 O-3).

[0051] (2) Preparation of BN / PI nanocomposite high temperature and high safety battery separator: the BN / H 2 The O-3 boron nitride water-based suspension is spread on the glass plate to form a suspension film with a thickness of 50μm, and then the electrospun PI nanofiber nonwoven ...

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Abstract

The invention discloses a nano composite multi-arc-hole membrane material. The nano composite multi-arc-hole membrane material is characterized in that a polyimide (PI) nano fiber nonwoven fabric is used as a base material, and pores of the base material are filled with nano boric nitride particles; the diameter of the nano boric nitride particles falls in a range of 50nm to 100nm, and the nano boric nitride particles account for 30 to 60 percent in the total weight of the nano composite multi-arc-hole membrane material; the thickness of the PI nano fiber nonwoven fabric is ranged from 9 micrometers to 38 micrometers, and the porosity is ranged from 60 percent to 80 percent. The nano composite multi-arc-hole membrane material is resistant to high temperature, heat shrinkage, high voltage, high current impact and mechanical collision, suitable for being used as a safety cell diaphragm and a safety super capacitor diaphragm and suitable for manufacturing various high-capacity and high-power lithium cells or super capacitors. The invention also provides a preparation method of the nano composite multi-arc-hole membrane material and an application of the nano composite multi-arc-hole membrane material as a cell diaphragm.

Description

Technical field [0001] The invention belongs to the field of battery diaphragms, and relates to a porous membrane material, in particular to a composite curved porous membrane material containing BN nanoparticles, a preparation method thereof, and application as a battery diaphragm. Background technique [0002] As the power battery of new energy vehicles, lithium-ion batteries have developed rapidly and will become indispensable daily necessities for mankind. However, because the lithium battery separators currently used are polyolefin porous membrane materials with poor temperature resistance, at higher temperatures, or under the conditions of battery overcharge, overdischarge 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...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/431H01M50/443H01M50/446H01M50/489H01M50/491
CPCH01M50/446H01M50/403Y02E60/10
Inventor 侯豪情简少菊陈林林范品超朱健廖孝剑叶婉
Owner JIANGXI NORMAL UNIV
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