Polyvinylidene fluoride film with biomimetic three-period minimal surface structure and its preparation and application

A technology of polyvinylidene fluoride and extremely small curved surface, which is applied in the direction of structural parts, separators/films/diaphragms/spacer elements, non-aqueous electrolyte batteries, etc. Complicated problems, to achieve good mechanical properties, save costs, and reduce costs

Active Publication Date: 2021-12-07
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of traditional PVDF diaphragm materials is complicated and the cost is high
In order to obtain a porous PVDF diaphragm material, it is necessary to mix PVDF with inorganic fillers, which limits its development to a certain extent, and it is even more difficult to obtain a diaphragm material with a three-period ordered network structure.

Method used

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  • Polyvinylidene fluoride film with biomimetic three-period minimal surface structure and its preparation and application
  • Polyvinylidene fluoride film with biomimetic three-period minimal surface structure and its preparation and application
  • Polyvinylidene fluoride film with biomimetic three-period minimal surface structure and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]Choose relatively flat discarded white sea urchin shells and wash them with plenty of water to remove residual protein and other organic components on the surface. Break up the cleaned sea urchin shells, try to make the relatively flat part have the largest surface area; first use sandpaper with a particle size of 400 to polish the sea urchin shells until both sides are flat, and then use sandpaper with a particle size of 600 to clean the white sea urchin shells. Sand paper to close to 100 μm, and then continue to sand with 1000-grit sandpaper until it reaches a translucent state (about 100 μm), then ultrasonically wash it in water for 1 hour, then ultrasonically wash it in ethanol for 0.5 hour, and place it in an oven at 80°C Drying was carried out to obtain almost transparent sea urchin shell flakes with a thickness of about 100 μm.

[0035] Put the dried sea urchin shell slices flat on a watch glass, and then dissolve PVDF in NMP at a mass ratio of 1:10, and stir cont...

Embodiment 2

[0039] Choose relatively flat discarded white sea urchin shells and wash them with plenty of water to remove residual protein and other organic components on the surface. Break up the washed sea urchin shells, try to make the relatively flat part have the largest surface area; first use sandpaper with a particle size of 600 to polish the sea urchin shells until both sides are flat, and then use sandpaper with a particle size of 800 Sandpaper was polished to close to 110 μm, and then continued to polish the translucent state (110 μm) with sandpaper with a particle size of 1200, and then ultrasonically washed in water for 2 hours, and then ultrasonically washed in ethanol for 1 hour, and dried in an oven at 60°C to obtain almost Transparent flakes of sea urchin shells about 110 μm thick.

[0040] Put the dried sea urchin shell slices flat on a watch glass, and then dissolve PVDF in NMP at a mass ratio of 1:15, and stir continuously at 55°C to completely dissolve PVDF in NMP with...

Embodiment 3

[0044] Choose relatively flat discarded white sea urchin shells and wash them with plenty of water to remove residual protein and other organic components on the surface. Break up the cleaned sea urchin shells, try to make the relatively flat part have the largest surface area; first use sandpaper with a particle size of 400 to polish the sea urchin shells until both sides are flat, and then use sandpaper with a particle size of 600 to clean the white sea urchin shells. Sand paper to close to 160 μm, and then continue to sand with 1000-grit sandpaper to a translucent state (about 160 μm), then ultrasonically wash it in water for 1 hour, then ultrasonically wash it in ethanol for 0.5 hour, and place it in an oven at 80°C Drying was carried out to obtain almost transparent sea urchin shell flakes with a thickness of about 160 μm.

[0045] Place the dried sea urchin shell slices flat on a watch glass, and then dissolve PVDF in NMP at a mass ratio of 1:5, and stir continuously at ...

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Abstract

The invention discloses a polyvinylidene fluoride film with a bionic three-period minimum curved surface structure and its preparation and application. The polyvinylidene fluoride membrane is obtained by using sea urchin shells with three-period minimal curved surface structure as a template, and is obtained by the following method: sea urchin shells are made into sea urchin shell sheets with a thickness not exceeding 160 μm, and PVDF is infiltrated into sea urchin shells with the help of a solvent The skeleton of the sheet is fully filled, and the sea urchin shell sheet filled with PVDF is soaked in acid to remove the sea urchin shell template, so as to obtain a polyvinylidene fluoride film with a bionic three-period minimally curved surface structure. When the polyvinylidene fluoride film with the biomimetic three-period minimally curved surface structure is used as a lithium metal battery separator, it can significantly improve the cycle stability of the lithium metal battery.

Description

(1) Technical field [0001] The invention belongs to the field of lithium batteries, and relates to a polytetrafluoroethylene film with a bionic three-period minimal curved surface (TPMS) structure, its preparation and its application as a separator in the field of lithium metal batteries. (2) Background technology [0002] The separator material plays a very important role in lithium batteries. It is located between the positive and negative electrodes, prevents the positive and negative electrodes from contacting, and can freely conduct ions while not conducting electrons. However, for lithium metal batteries, due to the activity of metallic lithium itself, it continuously reacts with the organic electrolyte during charging and discharging to form SEI. The continuous rupture and continuous consumption of electrolyte. Due to the inhomogeneity of lithium metal during the deposition process, lithium dendrites will be continuously generated, piercing the separator and causing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/463H01M50/426H01M50/403H01M10/052
CPCH01M10/052H01M50/403H01M50/463H01M50/411Y02E60/10
Inventor 刘育京吴玉选杨涛袁华栋郑建辉胡华良孙国元卢功勋张文魁陶新永
Owner ZHEJIANG UNIV OF TECH
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