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Solid nano porous membrane with temperature sensitive response characteristics and preparation method thereof

A nano-porous, responsive technology, applied to electrical components, circuits, battery pack components, etc., can solve problems such as narrow adjustment range, dangerous occurrence, and diaphragm fusing

Inactive Publication Date: 2015-03-11
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cut-off temperature of polyethylene is 120-130°C, the cut-off temperature of polypropylene is 150-160°C, the adjustment temperature of the composite film of the two is 130-140°C, and the adjustment range is narrow; and the temperature in the lithium-ion battery is further increased After reaching 160-170°C, the diaphragm will fuse and cause danger

Method used

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  • Solid nano porous membrane with temperature sensitive response characteristics and preparation method thereof
  • Solid nano porous membrane with temperature sensitive response characteristics and preparation method thereof
  • Solid nano porous membrane with temperature sensitive response characteristics and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] See figure 1 and figure 2 , to prepare anodized aluminum oxide nanoporous membranes with temperature-sensitive response properties.

[0040] 1). Surface treatment of anodized aluminum nanoporous membrane

[0041] Clean anodized aluminum nanoporous film (the aperture of nanopore is 100nm, porosity 67% with clear water and ethanol cleaning, electron microscope picture is as follows image 3 As shown, the atomic force scanning diagram is shown as Figure 5 shown), then put it into dilute hydrochloric acid with a concentration of 5%, and clean the anodized aluminum nanoporous membrane at room temperature for 20-30 seconds, then rinse the surface of the anodized aluminum nanoporous membrane with water, and then wash the anodized aluminum nanoporous membrane The nanoporous membrane is placed in distilled water for 3-4 hours, then taken out and dried for later use.

[0042] The anodized aluminum oxide nanoporous membrane after cleaning and drying is placed in oxygen plasm...

Embodiment 2

[0053] The preparation method is basically the same as in Example 1, except that 2 g of benzyl methacrylate monomer is added in the polymerization reaction of step 3).

[0054] In the electrolyte 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide, when the temperature exceeds the minimum critical transition temperature of the polybenzyl methacrylate in the above electrolyte 140°C When (Table 1), the polybenzyl methacrylate will collapse in the nanopore channel of the anodized aluminum nanoporous membrane as the substrate and on the film, block the nanopore channel, and change The electrical conductivity of the anodized aluminum nanoporous membrane as the base; its electrical conductivity is 1 / 7 of the electrical conductivity of the anodized aluminum nanoporous membrane as the base.

[0055] The porosity of the anodized aluminum oxide nanoporous membrane with temperature-sensitive response properties is 18%.

Embodiment 3

[0057] The preparation method is basically the same as in Example 1, except that 3 g of monomers are added in the polymerization reaction of step 3).

[0058] In the electrolyte 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide, when the temperature exceeds the minimum critical transition temperature of the polybenzyl methacrylate in the above electrolyte 151°C , the polybenzyl methacrylate will collapse in the nanopores of the anodized aluminum nanoporous membrane as the substrate and on the membrane, block the nanopores, and change the anode as the substrate The electrical conductivity of the aluminum oxide nanoporous membrane; its electrical conductivity is 1 / 6 of the electrical conductivity of the anodic aluminum oxide nanoporous membrane as the substrate.

[0059] The porosity of the anodized aluminum oxide nanoporous membrane with temperature-sensitive response properties is 20%.

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Abstract

The invention relates to a solid nano porous membrane with temperature sensitive response characteristics and a preparation method thereof. Methacrylic acid benzyl ester with temperature sensitive response characteristics or polymer of derivative of the methacrylic acid benzyl ester is grafted on the solid nano porous membrane serving as a substrate to form the solid nano porous membrane with temperature sensitive response characteristics in a lithium ion battery using ionic liquid as electrolyte. When temperature exceeds lowest critical transformation temperature (120-150 DEG C), in the ionic liquid, of the polymer, the polymer collapses in nano pores of the solid nano porous membrane and on the solid nano porous membrane to block the nano pores, namely the polymer intelligently closes the nano pores to change conductivity of the solid nano porous membrane. In the mean time, the solid nano porous membrane substrate serving as support material is good in stability at high temperature and free of fusing.

Description

technical field [0001] The invention belongs to the field of battery separators in lithium ion batteries, in particular to a solid nanoporous membrane with temperature-sensitive response characteristics in lithium ion batteries using ionic liquid as electrolyte and a preparation method thereof. Background technique [0002] Safety is an important issue in the research of lithium-ion batteries, because of its large charge / discharge current and poor heat dissipation conditions, which lead to an increase in the internal temperature of the battery, sometimes causing smoke, fire and explosion, and even personal injury. The separator in the lithium-ion battery can isolate the positive and negative electrodes to prevent the battery from short-circuiting, and at the same time act as a safety device to intelligently cut off the current. Therefore, when the lithium ion battery separator is in use, the safety of the separator is very important. In order to improve the safety performan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16C08J9/42C08J7/16
CPCY02E60/10
Inventor 江雷郭维周亚红
Owner INST OF CHEM CHINESE ACAD OF SCI
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