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

A membrane material, aluminum oxide technology, applied in hybrid capacitor separators, separators/films/diaphragms/spacer components, electrical components, etc., can solve the problem of low battery charge retention, large surface pore size, and high porosity High efficiency and other issues, to achieve the effect of excellent mechanical properties, small surface pore size, high heat resistance

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

[0034]A composite membrane material containing aluminum oxide micro-nano particles, which uses electrospun polyimide (PI) nanofiber nonwovens as a substrate, and the pores of the substrate are filled with aluminum oxide micro-nano particles (Al 2 o 3 -NP);

[0035] Its preparation method is as follows:

[0036] (1) Nano Al 2 o 3 Water-based suspension (Al 2 o 3 / H 2 O-1) Configuration: 80.0 grams of alumina powder (mainly distributed in diameter of 80 nm), 0.8 grams of ammonium polyacrylate, 8.0 grams of butyl acrylate-isooctyl acrylate copolymer, 300.0 grams of distilled water, put them in a beaker at one time, and Emulsified at a speed of 10,000 revolutions per minute to form a nano-alumina water-based suspension (Al 2 o 3 / H 2 O-1).

[0037] (2)Al 2 o 3 / PI nanocomposite porous membrane preparation: Al 2 o 3 / H 2 The O-1 alumina water-based suspension was spread flat on a glass plate to form a suspension film with a thickness of 40 μm, and then the electrospu...

Embodiment 2

[0040] A composite membrane material containing aluminum oxide micro-nano particles, which uses electrospun polyimide (PI) nanofiber nonwovens as a substrate, and the pores of the substrate are filled with aluminum oxide micro-nano particles (Al 2 o 3 -NP);

[0041] Its preparation method is as follows:

[0042] (1) Submicron Al 2 o 3 Water-based suspension (Al 2 o 3 / H 2 O-2) Configuration: 80.0 grams of alumina powder (mainly distributed in diameter of 500 nm), 0.6 grams of ammonium polyacrylate, 8.0 grams of butyl acrylate-isooctyl acrylate copolymer, 300.0 grams of distilled water, put them in a beaker at one time, Emulsify under the rotating speed of 8000 revolutions per minute, form the submicron alumina water-based suspension (Al 2 o 3 / H 2 O-2).

[0043] (2)Al 2 o 3 Preparation of / PI micro-nano composite porous membrane: the above-configured Al 2 o 3 / H 2 The O-2 alumina water-based suspension was spread flat on a glass plate to form a suspension film w...

Embodiment 3

[0046] A composite membrane material containing aluminum oxide micro-nano particles, which uses electrospun polyimide (PI) nanofiber nonwovens as a substrate, and the pores of the substrate are filled with aluminum oxide micro-nano particles (Al 2 o 3 -NP);

[0047] Its preparation method is as follows:

[0048] (1) Micron Al 2 o 3 Water-based suspension (Al 2 o 3 / H 2 O-3) Configuration: 80.0 grams of alumina powder (mainly distributed in diameter of 800nm), 0.4 grams of ammonium polyacrylate, 8.0 grams of butyl acrylate-isooctyl acrylate copolymer, 300.0 grams of distilled water, put them in a beaker at one time, Emulsify at a speed of 8000 rpm to form a micron aluminum oxide water-based suspension (Al 2 o 3 / H 2 O-3).

[0049] (2)Al 2 o 3 Preparation of / PI micro-nano composite porous membrane: the above-configured Al 2 o 3 / H 2 The O-3 alumina water-based suspension was spread flat on a glass plate to form a suspension film with a thickness of 60 μm, and the...

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Abstract

The invention discloses a micro-nano composite multi-curvature membrane material, which uses polyimide (PI) nanofiber non-woven fabric as a base material, and the pores of the base material are filled with micro-nano Al2O3 particles; the micro-nano Al2O3 The particles have a diameter between 50-800nm ​​and account for 20-50% of the total weight of the micro-nano composite multi-curved pore membrane material; the micro-nano composite multi-curved pore membrane material has a porosity between 30-60% , the average surface pore diameter is between 50-800nm, and the thickness is between 10-40μm. The micro-nano composite multi-curved hole membrane material provided by the invention is resistant to high temperature, thermal shrinkage, high voltage and high current impact, and mechanical impact resistance, and is suitable for use as a safety battery separator and a safety supercapacitor separator to manufacture various high-capacity and High power lithium battery or supercapacitor. The invention also provides a preparation method of the nanocomposite multi-curvature membrane material and its application as a battery separator.

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 multi-porous membrane material containing aluminum oxide micro-nano particles, 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01G11/52H01M50/403H01M50/44H01M50/443H01M50/446
CPCH01G11/52H01M50/409Y02E60/13Y02E60/10
Inventor 侯豪情王琦周小平程楚云张和安
Owner JIANGXI ADVANCED NANOFIBER S&T CO LTD
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