Porous polymer membrane, preparation method thereof and application of porous polymer membrane as gel polymer electrolyte

A porous membrane and polymer technology, applied in the field of polymer film preparation and application, can solve the problems of poor mechanical properties of electrolytes, decreased mechanical properties, unfavorable ion conduction, etc., and achieve improved compatibility, high mechanical strength, and chemical stability Good results

Active Publication Date: 2014-05-21
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] PEO-based gel polymer electrolyte is easy to crystallize, resulting in low room temperature conductivity; in PAN-based gel polymer electrolyte, the interface passivation between the gel polymer film and lithium electrode is serious, and the mechanical properties decrease when the content of plasticizer is high More serious; PMMA-based gel polymer electrolyte has poor mechanical properties; the polymer structure in PVDF-based gel polymer electrolyte is regular and easy to crystallize, which is not conducive to ion conduction
[0005] It can be seen that there are common problems in the commonly used gel polymer base, and the gel film stability, mechanical properties and compatibility with electrodes still need to be improved
In addition, the problem of electrolyte leakage from the gel has not been properly solved

Method used

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  • Porous polymer membrane, preparation method thereof and application of porous polymer membrane as gel polymer electrolyte
  • Porous polymer membrane, preparation method thereof and application of porous polymer membrane as gel polymer electrolyte
  • Porous polymer membrane, preparation method thereof and application of porous polymer membrane as gel polymer electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Dissolve 0.1015g polyvinyl formal (PVFM) in 1.0125g N-methylpyrrolidone (NMP), stir magnetically at 45°C until PVFM is completely dissolved, add 0.0300g 4,4'-diphenylmethane diisocyanate to the solution (MDI), stirred at 75°C for 30 minutes, then added dropwise 0.1295g of deionized water as a non-solvent for polyvinyl acetal and its polyurethane products, white micelles were precipitated, and the white micelles could be dissolved after stirring, and continued magnetic stirring After 30 minutes, the mixed solution was prepared. The mixed solutions were coated and immersed in deionized water to prepare a porous film, and the obtained porous film was dried for 1 hour. The method of drying the porous membrane may be, for example, but not limited to, placing the porous membrane at 30° C. to 60° C., and drying by blowing air or vacuum. figure 2 It is the microscopic morphology of the PVFM polymer porous membrane prepared in Example 1, and the uniformly distributed connected...

Embodiment 2

[0051] Dissolve 0.1049g polyvinyl butyral (PVB) in 1.9975g N-methylpyrrolidone (NMP), stir magnetically at 45°C until PVB is completely dissolved, add 0.0111g 4,4'-diphenylmethane di For isocyanate (MDI), stir at 75°C for 30 minutes, then add dropwise 0.0971g of deionized water, and white micelles are precipitated, which can be dissolved after stirring. Continue magnetic stirring for 30 minutes, and the mixed solution is prepared. The mixed solutions were coated and immersed in deionized water to prepare a porous film, and the obtained porous film was dried for 1 hour. The method of drying the porous membrane may be, for example, but not limited to, placing the porous membrane at 30° C. to 60° C., and drying by blowing air or vacuum. image 3 It is the microscopic morphology of the PVB polymer porous membrane prepared in Example 2, and the evenly distributed connected pores bring a high liquid absorption rate of 610%. The high liquid absorption rate and high chemical stabilit...

Embodiment 3

[0053] Dissolve 0.1012g polyvinyl formal (PVFM) in 1.0343g N-methylpyrrolidone (NMP), stir magnetically at 45°C until PVFM is completely dissolved, add 0.0315g 4,4'-diphenylmethane diisocyanate to the solution (MDI), stirred at 75°C for 30 minutes, then added dropwise 0.0114 g of deionized water, and white micelles were precipitated, which could be dissolved after stirring. Continue magnetic stirring for 30 minutes, and the mixed solution was prepared. The mixed solutions were coated and immersed in deionized water to prepare a porous film, and the obtained porous film was dried for 1 hour. The method of drying the porous membrane may be, for example, but not limited to, placing the porous membrane at 30° C. to 60° C., and drying by blowing air or vacuum. The synthetic PVFM polymer porous membrane prepared in Example 3 has a high liquid absorption rate of 411% and high chemical stability, which provides a prerequisite for the formation of a stable gel electrolyte system and th...

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Abstract

The invention provides a porous polymer membrane prepared from a polyvinyl acetal polymer treated by using polyurethane and a preparation method of the porous polymer membrane. Communicated holes are uniformly distributed in the porous polymer membrane, the porous polymer membrane has better electrolyte adsorption capacity and high electrolyte uptake rate up to over 300%, the gelation of the system is realized through adsorbing swelled electrolyte, and the porous polymer membrane and a gel system can stably exist for a long term. The conductivity of a gel polymer electrolyte approaches to the average value 1.0*10<-3>S/cm of the conductivity of a liquid electrolyte, the electrochemical stability window is 2.0-5.0V, the mechanical performance and the electrode compatibility are remarkably improved, the porous polymer membrane can be applied as the gel polymer electrolyte, and the safety of a battery is improved. Meanwhile, diaphragms in a liquid electrolyte system or other battery systems do not need to be used as supports.

Description

technical field [0001] The invention belongs to the technical field of polymer film preparation and application, and in particular relates to a polymer porous film and a preparation method thereof, and the application of a stable system for absorbing and swelling electrolyte as a gel polymer electrolyte. Background technique [0002] Gel polymers are widely used. As a gel polymer electrolyte system to replace the liquid electrolyte of lithium-ion batteries, it has a high ionic conductivity close to that of a liquid electrolyte and has the characteristics of a solid electrolyte that does not leak. It can solve the high volatility and flammability of the organic electrolyte, which may cause safety problems such as rupture, fire and explosion in the case of a short circuit. Provide guarantee for the application of large lithium-ion batteries in the field of new energy vehicles, solar energy, and wind energy storage equipment. [0003] At present, there are many researches main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/10C08G18/56C08J9/28C08J5/18H01M2/16H01M10/0525H01M10/058H01M50/403H01M50/414H01M50/417H01M50/491
CPCB01D71/40B01D71/54H01M10/052Y02E60/10Y02P70/50H01M50/414
Inventor 连芳任岩关红艳文炎
Owner UNIV OF SCI & TECH BEIJING
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