Polyethylene oxide (PEO)-based solid polymer electrolyte membrane and preparation method thereof

A solid polymer, electrolyte membrane technology, used in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of poor thermal and electrical properties, and achieve good moldability, uniform texture, and excellent mechanical properties. Effect

Inactive Publication Date: 2017-06-20
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, only the combination of the two results in poor thermal and electrical properties of the film

Method used

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  • Polyethylene oxide (PEO)-based solid polymer electrolyte membrane and preparation method thereof
  • Polyethylene oxide (PEO)-based solid polymer electrolyte membrane and preparation method thereof
  • Polyethylene oxide (PEO)-based solid polymer electrolyte membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0041] Dissolve PEO (0.7g) in dichloromethane (40ml) and seal it and place it in an iodine bottle for 12h. Then take PMMA (0.3g) and dissolve it in dichloromethane (10ml). in methyl chloride solution. Stir well, heat until fully dissolved, then add lithium perchlorate (0.1g) and stir at room temperature until fully dissolved. Put the rotor into the iodine flask, seal it, and stir magnetically at 700rmp for 90min at 25°C.

[0042] Weigh the LCI / MMT hybrid material (0.004g) and dissolve it in a test tube by shaking with 2ml N-methylpyrrolidone. Add the LCI / MMT solution to the PEO / PMMA solution and mix and stir evenly. For scraping the film, the thickness of the scraper is set to 0.5 mm. The homogeneous film was automatically scraped off, and the prepared film was dried at 50°C for 2 hours in a blast drying oven, and then the substrate was peeled off with a blade. Then vacuum-dry at 45°C for 12 hours to completely remove the solvent.

[0043] The prepared solution was scraped...

example 2

[0047] The difference from Example 1 is that the added amount of LCI / MMT hybrid material is 0.007g.

[0048] The thickness of the obtained film was 0.033 mm.

example 3

[0050] The difference from Example 1 is that the added amount of the LCI / MMT hybrid material is 0.01 g.

[0051] The thickness of the obtained film was 0.031 mm.

[0052] figure 1 It is the Nyquist curve of the AC impedance of the polymer electrolyte membrane. It can be seen that the intersection point between the low frequency region and the horizontal axis of Example 3 (SPEs-M3) is the smallest, Rb=24.62Ω, and the conductivity σ=4.00×10-3. figure 2 It is the scanning electron microscope picture of Example 3, it can be seen that the particle size of the hybrid material in the film is similar, and the dispersion is uniform.

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Abstract

The invention belongs to the technical field of a chemical power supply, and particularly relates to a polyethylene oxide (PEO)-based solid polymer electrolyte membrane and a preparation method thereof. The PEO-based solid polymer electrolyte membrane comprises a polymer substrate and an alkali metal salt, wherein the EO/Li mass ratio of the polymer substrate and the alkali metal salt is (5-30):1, the polymer is a copolymer of PEO and polymethyl methacrylate (PMMA), the molecular weight of the PEO is 100,000-1,000,000, the molecular weight of the PMMA is 25,000-100,000, and the alkali metal salt is more than one of LiClO4, LiPF6, LiBF4, LiTFSI, LiAsF6, Li B(C2O4)2(Li BOB) and Li SO2CF3(Li Tf).

Description

[0001] Technical field: [0002] The invention belongs to the technical field of chemical power sources, and in particular relates to a PEO-based solid polymer electrolyte membrane and a preparation method thereof. [0003] Background technique: [0004] All-solid-state lithium secondary battery refers to a lithium secondary battery in which all components of the battery, including positive and negative electrodes and electrolytes, are made of solid materials. Because the solid polymer electrolyte is used to replace the traditional liquid electrolyte, the polymer lithium-ion secondary battery has the advantages of thinning, arbitrary area and arbitrary shape, and there will be no safety hazards such as leakage, combustion and explosion. on the question. [0005] The main chain of polyethylene oxide (PEO) contains strong electron-donating groups. In the complex system composed of ether oxygen functional groups and alkali metal (MX), PEO acts as an ion-conducting matrix Li+ as a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058
CPCH01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 张爱玲张楠王松李三喜
Owner SHENYANG POLYTECHNIC UNIV
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