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Poly(p-phenylenebenzobisoxazole) porous membrane, preparation method and application thereof

A technology of benzobisoxazole and poly-p-phenylene, which is applied in the field of lithium-ion secondary batteries, can solve the problems of poor heat resistance and low strength of the separator, and achieve the effects of high tensile strength, uniform distribution and good permeability

Inactive Publication Date: 2014-04-23
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the poor heat resistance and low strength of the diaphragm applied to lithium-ion secondary batteries, the object of the present invention is to provide a poly-p-phenylene benzobisoxazole porous film and its preparation method and application. Specific applications in lithium-ion secondary batteries

Method used

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  • Poly(p-phenylenebenzobisoxazole) porous membrane, preparation method and application thereof
  • Poly(p-phenylenebenzobisoxazole) porous membrane, preparation method and application thereof
  • Poly(p-phenylenebenzobisoxazole) porous membrane, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Step 1: Add poly-p-phenylenebenzobisoxazole fibers with a molecular weight of 105,000 to a mixed solvent of methanesulfonic acid (MSA) and trifluoroacetic acid (TFA) (the volume ratio of MSA and TFA is 7:3), Stir for one week under dry conditions at room temperature to form a 1% by mass poly-p-phenylenebenzobisoxazole solution.

[0055] Step 2: After the solution is subjected to vacuum defoaming treatment, it is cast into a film in an isopentane atmosphere to obtain a poly-p-phenylenebenzobisoxazole film blank.

[0056] Step 3: remove the film blank and immerse it in isopropanol at a temperature of -40°C for 4 hours, then take out the treated film blank and immerse it in deionized water at a temperature of 10°C for 4 hours to obtain Gel-state films of poly(p-phenylenebenzobisoxazole). Then the gel-state film was taken out and placed in a freezer at -50° C. for 4 hours, and vacuum-dried at this temperature for 12 hours to obtain a poly-p-phenylenebenzobisoxazole porous ...

Embodiment 2

[0059] Step 1: Add poly-p-phenylenebenzobisoxazole fibers with a molecular weight of 110,000 to a mixed solvent of methanesulfonic acid (MSA) and trifluoroacetic acid (TFA) (MSA and TFA volume ratio is 2:8), Stir for one week under dry conditions at room temperature to form a poly-p-phenylenebenzobisoxazole solution with a mass percentage of 15%.

[0060] Step 2: After the solution is subjected to vacuum defoaming treatment, it is cast into a film in an isopentane atmosphere to obtain a poly-p-phenylenebenzobisoxazole film blank.

[0061] Step 3: taking out the film blank and immersing it in deionized water at a temperature of 10° C. for 24 hours to obtain a gel-state film of poly-p-phenylenebenzobisoxazole. Then the gel-state film was taken out and placed in a freezer at -10° C. for 24 hours, and vacuum-dried at this temperature for 12 hours to obtain a poly-p-phenylenebenzobisoxazole porous film.

[0062] The obtained poly-p-phenylene benzobisoxazole porous membrane was cha...

Embodiment 3

[0064] Step 1: Add poly-p-phenylenebenzobisoxazole fibers with a molecular weight of 105,000 to a mixed solvent of methanesulfonic acid (MSA) and trifluoroacetic acid (TFA) (the volume ratio of MSA and TFA is 1:1), Stir for one week under dry conditions at room temperature to form a poly-p-phenylenebenzobisoxazole solution with a mass percentage of 10%.

[0065] Step 2: After the solution is subjected to vacuum defoaming treatment, it is cast into a film in an isopentane atmosphere to obtain a poly-p-phenylenebenzobisoxazole film blank.

[0066] Step 3: Take out the film blank and immerse it in a mixed solvent with a volume ratio of deionized water and ethanol of 1:1 for 12 hours, and the temperature of the mixed solvent is 10° C. colloidal film. Then the gel-state film was taken out and placed in a freezer at -50° C. for 24 hours, and vacuum-dried at this temperature for 16 hours to obtain a poly-p-phenylenebenzobisoxazole porous film.

[0067] The obtained poly-p-phenylene...

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Abstract

The invention relates to a poly(p-phenylenebenzobisoxazole) porous membrane, a preparation method and an application thereof, and belongs to the technical field of lithium ion secondary batteries, wherein the membrane is composed of poly(phenylenebenzobisoxazole) (POB) fiber, the thickness of the membrane is 3-40 microns; pores on the surface and inside the membrane are distributed uniformly, the pore diameter is adjustable, the membrane has good air permeability, excellent resistance to high temperature and high tensile strength. The preparation method of the membrane is that a POB solution is subjected to vacuum defoamation treatment, solvent exchange after curtain coating and film forming, and freeze drying to obtain the membrane. The POB membrane provided by the invention can be used as the barrier film of a lithium ion secondary battery and has good performance.

Description

technical field [0001] The invention relates to a poly-p-phenylene benzobisoxazole porous film and a preparation method and application thereof, belonging to the field of lithium ion secondary batteries. Background technique [0002] At present, batteries with high specific capacity, high voltage, and high energy density use various liquid organic electrolytes. In all batteries using liquid organic electrolytes, a porous polymer separator must be used, which acts to physically separate the positive and negative active materials while allowing ions to pass through. [0003] Polyethylene or polypropylene film has the following problems as a battery separator: its heat resistance is poor, and at the same time, in order to make the film have sufficient strength, the film must have a certain lower limit of thickness, which limits the further improvement of battery capacity. If the thickness of the film is simply reduced, the local strength of the film will be insufficient, and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/18H01M50/44H01M50/463
CPCH01M10/058H01M10/0525H01M50/411H01M50/44Y02E60/10
Inventor 孙克宁郝晓明王振华
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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