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

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: 2016-08-31
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 is based on electrospun polyimide (PI) nanofiber nonwovens, and the pores of the substrate are filled with BN nanoparticles (BN-NP);

[0037] Its 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 30nm), 1.0 grams of ammonium polyacrylate, 8.0 grams of polybutyl acrylate-isooctyl, 300.0 grams of distilled water, put into a beaker at one time, Emulsify at a speed of 8000 rpm 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-resistant high-safety battery separator: the above-configured BN / H 2 The O-1 boron nitride water-based suspension was spread flat on a glass plate to form a suspension film with a thickness of 30 μm, and then the electrospun PI nanofiber nonwoven with a th...

Embodiment 2

[0042] A composite membrane material containing BN nanoparticles, which is based on electrospun polyimide (PI) nanofiber nonwovens, and the pores of the substrate are filled with BN nanoparticles (BN-NP);

[0043] Its 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 100 nm in diameter), 0.5 grams of ammonium polyacrylate, 8.0 grams of polybutyl acrylate-isooctyl, 433.0 grams of distilled water, put into a beaker at one time, Emulsify at a speed of 8000 rpm to form a nano-boron nitride water-based suspension (BN / H 2 O-2).

[0045] (2) Preparation of BN / PI nanocomposite high-temperature-resistant high-safety battery separator: the above-configured BN / H 2 The O-2 boron nitride water-based suspension was spread flat on a glass plate to form a suspension film with a thickness of 60 μm, and then the electrospun PI nanofiber nonwoven with a thickness of 38 μm was...

Embodiment 3

[0048] A composite membrane material containing BN nanoparticles, which is based on electrospun polyimide (PI) nanofiber nonwovens, and the pores of the substrate are filled with BN nanoparticles (BN-NP);

[0049] Its 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 50nm), 0.8 grams of ammonium polyacrylate, 8.0 grams of polybutyl acrylate-isooctyl, 300.0 grams of distilled water, put into a beaker at one time, Emulsify at a speed of 8000 rpm to form a micron boron nitride water-based suspension (BN / H) with an absolute viscosity of 24mPa·S 2 O-3).

[0051] (2) Preparation of BN / PI nanocomposite high-temperature-resistant high-safety battery separator: the above-configured BN / H 2 The O-3 boron nitride water-based suspension was spread flat on a glass plate to form a suspension film with a thickness of 50 μm, and then the electrospun PI nanofiber no...

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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 nano boron nitride particles are filled in the pores of the base material; the nano boron nitride Boron 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 separator and a safe supercapacitor separator, and can be used to manufacture various high-capacity and high-voltage membranes. 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 and relates to a porous membrane material, in particular to a composite porous membrane material containing BN 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. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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