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PI-PTEF-Al2O3 ternary nanocomposite multi-curved-porous membrane material, preparation method and application therefor

A nano-composite, PTFE-NP technology, applied in the direction of electrical components, circuits, battery pack components, etc., can solve the problems of low battery charge retention, large surface pore size, high porosity, etc., and achieve improved heat shrinkage resistance Performance, small surface pore size, effect of good pore structure

Active Publication Date: 2016-01-06
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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] An organic / inorganic ternary nanocomposite membrane material, which is based on electrospun polyimide (PI) nanofiber nonwoven fabric, and the pores of the substrate are filled with polytetrafluoroethylene nanospheres (PTFE-NP) and aluminum oxide nanoparticles (Al 2 o 3 -NP), both weight ratios are 42 / 38;

[0035] Its preparation method is as follows:

[0036] (1) Water-based mixed suspension of polytetrafluoroethylene nanospheres and alumina nanoparticles (PTFE-NP / Al 2 o 3 -NP / H 2 O-1) configuration: 70.0 grams of polytetrafluoroethylene nanospheres (mainly distributed in diameter at 300nm) emulsion (solid content 60wt%), 38.0 grams of aluminum oxide nanoparticles (mainly distributed at 200nm in particle diameter), polyacrylic acid 0.3 grams of ammonium, 8.7 grams of butyl acrylate-isooctyl acrylate copolymer, 328.0 grams of distilled water, put them in a beaker at one time, and emulsify at a speed of 8000 revolutions per minute to form polytetrafluoroethylene with...

Embodiment 2

[0040] An organic / inorganic ternary nanocomposite membrane material, which is based on electrospun polyimide (PI) nanofiber nonwoven fabric, and the pores of the substrate are filled with polytetrafluoroethylene nanospheres (PTFE-NP) and aluminum oxide nanoparticles (Al 2 o 3 -NP), the two weight ratios are 30 / 50;

[0041] Its preparation method is as follows:

[0042] (1) Water-based mixed suspension of polytetrafluoroethylene nanospheres and alumina nanoparticles (PTFE-NP / Al 2 o 3 -NP / H 2 O-2) configuration: 50.0 grams of polytetrafluoroethylene nano-microspheres (mainly distributed in diameter at 300nm) emulsion (solid content 60wt%), 50.0 grams of aluminum oxide nanoparticles (mainly distributed at 100nm in particle diameter), polyacrylic acid 0.4 grams of ammonium, 8.6 grams of butyl acrylate-isooctyl acrylate copolymer, 570.0 grams of distilled water, put them in a beaker at one time, and emulsify at a speed of 8000 revolutions per minute to form polytetrafluoroethy...

Embodiment 3

[0046] An organic / inorganic ternary nanocomposite membrane material, which is based on electrospun polyimide (PI) nanofiber nonwoven fabric, and the pores of the substrate are filled with polytetrafluoroethylene nanospheres (PTFE-NP) and aluminum oxide nanoparticles (Al 2 o 3 -NP), the two weight ratios are 30 / 50;

[0047] Its preparation method is as follows:

[0048] (1) Water-based mixed suspension of polytetrafluoroethylene nanospheres and alumina nanoparticles (PTFE-NP / Al 2 o 3 -NP / H 2 O-3) configuration: 50.0 grams of polytetrafluoroethylene nano-microspheres (mainly distributed in diameter 300nm) emulsion (solid content 60wt%), 50.0 grams of aluminum oxide nanoparticles (mainly distributed in 500nm), polyacrylic acid 0.5 grams of ammonium, 8.5 grams of butyl acrylate-isooctyl acrylate copolymer, 415.0 grams of distilled water, put them in a beaker at one time, emulsify at a speed of 8000 revolutions per minute, and form polytetrafluoroethylene with an absolute visc...

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Abstract

The invention discloses a PI-PTEF-Al2O3 ternary nanocomposite multi-curved-porous membrane material. The PI-PTEF-Al2O3 ternary nanocomposite multi-curved-porous membrane material takes polyimide (PI) nanofiber non-woven fabric as a base material, and composite nanoparticles are filled in pores of the base material; the multi-curved-porous membrane material is characterized in that the composite nanoparticles are formed by mixing polytetrafluoroethylene nano microspheres (PTFE-NP) and aluminium oxide nanoparticles (Al2O3-NP) at the weight ratio of (7-12) / (8-13). The nanocomposite multi-curved-porous membrane material provided by the invention is resistant to high temperature, moderate in porosity, moderate in surface density, good in ion transmission property and excellent in mechanical property; when the nanocomposite multi-curved-porous membrane material is used in lithium ion batteries, the problem of micro-short-circuit of batteries caused by overhigh porosity of pure polyimide nanofiber membrane can be solved; and in addition, the serious problem of thermal runaway caused by mechanical collisions of power lithium ion batteries can be solved.

Description

technical field [0001] The invention belongs to the field of battery diaphragms and relates to a multi-porous membrane material, in particular to an organic / inorganic ternary nanocomposite material, a preparation method thereof and an application as a battery diaphragm. 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. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/417H01M50/423H01M50/431H01M50/44H01M50/443H01M50/446
CPCH01M50/403H01M50/411H01M50/44H01M50/446Y02E60/10
Inventor 侯豪情陈林林许文慧叶婉简少菊朱健廖孝剑
Owner JIANGXI NORMAL UNIV
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