Composite porous membrane material filled with polytetrafluoroethylene microspheres and its preparation method and application

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

Active Publication Date: 2017-04-05
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 composite multi-porous membrane material filled with PTFE-NP, which uses polyimide (PI) nanofiber nonwoven fabric as a base material, and the pores of the base material are filled with polytetrafluoroethylene nano-microspheres ( PTFE-NP); Described PTFE-NP, its diameter is between 100-300nm, accounts for 30-60% of the total weight of nanocomposite multi-porous membrane material; Described PI nanofiber non-woven fabric is thickness between 9 Electrospun PI nanofiber nonwoven fabric with a porosity between ‑38 μm, a porosity between 60‑80%, and a fiber diameter below 0.5 μm. The nanocomposite multi-porous membrane material provided by the invention is resistant to high temperature, heat shrinkage, high voltage and high current impact, and mechanical impact, and is suitable for use as a safe battery diaphragm and a safe supercapacitor diaphragm to manufacture various high-capacity and high-capacity Power lithium battery or super capacitor. The invention also provides a preparation method of the nanocomposite porous membrane material and its application 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 Patents(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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