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Pi-bn-ptfe ternary nanocomposite porous membrane material and its preparation method and application

A nano-composite, PTFE-NP technology, applied in the field of battery separators, can solve the problems of low battery charge retention, large surface pore size, high porosity, etc., and achieve improved electrical breakdown strength, small surface pore size, and good pore structure. 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

[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 boron nitride nanoparticles (BN-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 boron nitride nanoparticles (PTFE-NP / BN-NP / H 2 O-1) configuration: polytetrafluoroethylene nano-microspheres (diameter mainly distributed in 300nm) emulsion (solid content 60wt%) 70.0 grams, boron nitride nanoparticles (main particle diameter distributed in 200nm) 38.0 grams, 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...

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 boron nitride nanoparticles (BN-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 boron nitride nanoparticles (PTFE-NP / BN-NP / H 2 O-2) configuration: 50.0 grams of polytetrafluoroethylene nano-microspheres (mainly distributed in diameter 300nm) emulsion (solid content 60wt%), 50.0 grams of boron 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 viscosit...

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 boron nitride nanoparticles (BN-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 boron nitride nanoparticles (PTFE-NP / BN-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 boron 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 viscosity of 2...

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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 the pores of the base material are filled with composite nanoparticles; it is characterized in that: the composite The nanoparticles are composed of polytetrafluoroethylene nanospheres (PTFE‑NP) and boron nitride nanoparticles (BN‑NP) in a weight ratio of (7‑12) / (8‑13). The nanocomposite multi-porous membrane material provided by the invention has high temperature resistance, high hardness, moderate porosity, moderate areal density, good ion transport and excellent mechanical properties. The imide nanofiber diaphragm causes the problem of micro-short circuit of the battery due to high porosity; it can solve the serious problem of thermal runaway caused by mechanical collision of power lithium-ion batteries.

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 Patents(China)
IPC IPC(8): H01M2/16H01M2/14H01G11/52H01G11/84H01M50/40H01M50/403H01M50/423H01M50/44H01M50/446
CPCH01G11/52H01G11/84H01M2220/20H01M50/411H01M50/44H01M50/403Y02E60/10
Inventor 侯豪情李永红陈林林李春根朱健廖孝剑叶婉
Owner JIANGXI NORMAL UNIV
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