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Polytetrafluoroethylene nanoparticle-filled composite tortuous porous membrane material and preparation method and application thereof

A membrane material and curved hole technology, which is applied in the field of porous membrane materials and composite multi-porous membrane materials, can solve the problems of large surface pore size, micro-short circuit, low battery charge retention rate, etc.

Active Publication Date: 2015-12-16
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] A composite porous membrane material filled with PTFE-NP, which uses electrospun polyimide (PI) nanofiber nonwoven fabric as a base material, and PTFE-NP is filled in the pores of the base material;

[0035] Its preparation method is as follows:

[0036] (1) Water-based suspension of polytetrafluoroethylene nanospheres (PTFE-NP / H 2 O-1) configuration: polytetrafluoroethylene nano-microsphere emulsion (mass solubility 60%, wherein the surfactant ammonium perfluorooctanoate accounts for 5% of polytetrafluoroethylene; the main diameter of the microspheres is distributed at 300nm) 134.0 grams, polyacrylic acid 0.5 grams of ammonium, 16.0 grams of butyl acrylate-isooctyl acrylate copolymer emulsion (mass concentration 50%), 144.5 grams of distilled water, put into a beaker at one time, and emulsify at a speed of 8000 revolutions per minute to form an absolute viscosity of 22mPa The water-based suspension of polytetrafluoroethylene nanospheres of S (PTFE-NP / H 2 O-1).

[0037...

Embodiment 2

[0040] A composite porous membrane material filled with PTFE-NP, which uses electrospun polyimide (PI) nanofiber nonwoven fabric as a base material, and PTFE-NP is filled in the pores of the base material;

[0041] Its preparation method is as follows:

[0042] (1) Water-based suspension of polytetrafluoroethylene nanospheres (PTFE-NP / H 2 O-2) configuration: 134.0 grams of polytetrafluoroethylene nano-microsphere emulsion (mass solubility 60%, wherein the surfactant ammonium perfluorooctanoate accounts for 5% of polytetrafluoroethylene; the main diameter of the microspheres is distributed at 100nm), polyacrylic acid 0.8 grams of ammonium, 16.0 grams of butyl acrylate-isooctyl acrylate copolymer emulsion (mass concentration 50%), 342.5 grams of distilled water, put into a beaker at one time, emulsify under the rotating speed of 8000 revolutions per minute, and form an absolute viscosity of 17mPa The water-based suspension of polytetrafluoroethylene nanospheres of S (PTFE-NP / H ...

Embodiment 3

[0046] A composite porous membrane material filled with PTFE-NP, which uses electrospun polyimide (PI) nanofiber nonwoven fabric as a base material, and PTFE-NP is filled in the pores of the base material;

[0047] Its preparation method is as follows:

[0048] 1) Preparation of polytetrafluoroethylene microspheres (PTFEMP):

[0049] (1) Water-based suspension of polytetrafluoroethylene nanospheres (PTFE-NP / H 2 O-3) configuration: 134.0 grams of polytetrafluoroethylene nano-microsphere emulsion (mass solubility 60%, wherein the surfactant ammonium perfluorooctanoate accounts for 5% of polytetrafluoroethylene; the main diameter of the microspheres is distributed at 100nm), polyacrylic acid 0.8 grams of ammonium, 16.0 grams of butyl acrylate-isooctyl acrylate copolymer emulsion (mass concentration 50%), 204.4 grams of distilled water, put into a beaker at one time, and emulsify at a speed of 8000 revolutions per minute to form an absolute viscosity of 20mPa The water-based sus...

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Abstract

The invention discloses a polytetrafluoroethylene nanoparticle (PTFE-NP)-filled composite tortuous porous membrane material. With polyimide (PI) nanofiber nonwoven fabric as a base material, holes of the base materials are filled with polytetrafluoroethylene nanoparticles (PTFE-NPs); the PTFE-NPs are 100-300nm in diameter and account for 30%-60% of total weight of the composite tortuous porous membrane material; and the PI nanofiber nonwoven fabric is electrospinning PI nanofiber nonwoven fabric of which the thickness is 9-38 microns, the porosity is 60%-80% and the fiber diameters are less than 0.5 micron. The nano composite tortuous porous membrane material disclosed by the invention has the advantages of high temperature resistance, heat shrinkage resistance, high voltage impact resistance, high current impact resistance and mechanical impact resistance, and is suitable for manufacturing various high-capacity and high-power lithium batteries or super capacitors as a safe battery diaphragm and a safe super capacitor diaphragm. The invention further provides a preparation method of the nano composite tortuous porous membrane material and an application of the composite tortuous porous membrane material 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 PTFE-NP, 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. [0003] F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/42H01M10/0525H01M50/403H01M50/423H01M50/431H01M50/44H01M50/491
CPCH01M10/0525H01M10/4235H01M50/411H01M50/44Y02E60/10
Inventor 侯豪情陈林林朱健廖孝剑叶婉周刚勇熊天柔
Owner JIANGXI NORMAL UNIV
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