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PI-AlN-PTFE ternary nano-composite multi-curve pore membrane material and preparing method and application thereof

A nano-composite, PTFE-NP technology, used in electrical components, electrolytic capacitors, non-aqueous electrolyte batteries, etc., can solve the problems of low battery charge retention, large surface pore size, high porosity, etc., to improve electrical breakdown. Effects of strength, small surface pore size, good pore structure

Active Publication Date: 2015-11-11
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

[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 nitride nanoparticles (AlN-NP), the weight ratio of the two is 42 / 38;

[0035] Its preparation method is as follows:

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

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 nitride nanoparticles (AlN-NP), the weight ratio of the two is 30 / 50;

[0041] Its preparation method is as follows:

[0042] (1) Water-based mixed suspension of polytetrafluoroethylene nanospheres and aluminum nitride nanoparticles (PTFE-NP / AlN-NP / H 2 O-2) configuration: 50.0 grams of polytetrafluoroethylene nanospheres (mainly distributed in diameter 300nm) emulsion (solid content 60wt%), 50.0 grams of aluminum nitride nanoparticles (mainly distributed in 100nm), ammonium polyacrylate 0.4 grams, 8.6 grams of butyl acrylate-isooctyl acrylate copolymer, 570.0 grams of distilled water, put them in a beaker at one time, emulsify at a speed of 8000 revolutions per minute, and form a polytetrafluoroethylene nanometer with an absolute vis...

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 nitride nanoparticles (AlN-NP), the weight ratio of the two is 30 / 50;

[0047] Its preparation method is as follows:

[0048] (1) Water-based mixed suspension of polytetrafluoroethylene nanospheres and aluminum nitride nanoparticles (PTFE-NP / AlN-NP / H 2 O-3) configuration: 50.0 grams of polytetrafluoroethylene nanospheres (mainly distributed in diameter 300nm) emulsion (solid content 60wt%), 50.0 grams of aluminum nitride nanoparticles (mainly distributed in 500nm), ammonium polyacrylate 0.5 grams, 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 a polytetrafluoroethylene nanometer with an absolute vis...

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Abstract

The invention discloses a nano-composite multi-curve pore membrane material, polyimide (PI) nano-fiber non-woven fabric serves as the base material, and base material pores are filled with composite nano-particles. The nano-composite multi-curve pore membrane material is characterized in that the nano-particles are formed by mixing polytetrafluoroethylene nanoparticle (PTFE-NP) and aluminium nitride nanoparticle (AlN-NP) at the weight ratio of (7-12) / (8-13). The nano-composite multi-curve pore membrane material is resistant to high temperature, high in hardness, proper in porosity, proper in surface density, good in ion transmission performance and good in mechanical performance, when the nano-composite multi-curve pore membrane material is used in lithium-ion batteries, the problem of a battery micro short circuit due to the excessively-high porosity of a pure polyimide nano-fiber membrane can be solved, and the serious problem of thermal runaway caused by the mechanical collision of the 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): H01M2/16H01M10/05H01G9/02H01M50/403H01M50/457H01M50/489H01M50/491
CPCH01M10/05H01G9/02H01M50/446Y02E60/10
Inventor 侯豪情冯艳熊天柔周刚勇朱丽徐海波周松智
Owner JIANGXI NORMAL UNIV
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