PVDF-HFP/PMMA/CMC Composite Membrane and Its Preparation Method and Application

A technology of PVDF-HFP and composite membranes, which is applied in the field of PVDF-HFP/PMMA/CMC composite membranes and its preparation, can solve the problems of poor electrical conductivity of blended membranes, and achieve improved liquid retention, cycle life, and crystallinity low effect

Active Publication Date: 2022-02-18
GANNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrical conductivity of PVDF-HFP / PMMA blend film is poor and needs to be further improved.

Method used

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  • PVDF-HFP/PMMA/CMC Composite Membrane and Its Preparation Method and Application
  • PVDF-HFP/PMMA/CMC Composite Membrane and Its Preparation Method and Application
  • PVDF-HFP/PMMA/CMC Composite Membrane and Its Preparation Method and Application

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preparation example Construction

[0030] The present invention also provides a preparation method of the PVDF-HFP / PMMA / CMC composite membrane described in the above technical scheme, comprising the following steps:

[0031] (1) Provide PVDF-HFP / PMMA film;

[0032] (2) Apply a layer of CMC solution on the PVDF-HFP / PMMA film, and dry to obtain the PVDF-HFP / PMMA / CMC composite film.

[0033] The present invention provides PVDF-HFP / PMMA film earlier; The preparation method of described PVDF-HFP / PMMA film preferably comprises the following steps:

[0034] The PVDF-HFP, PMMA and solvent are mixed, and the PVDF-HFP / PMMA thin film is obtained through static defoaming, film formation and drying.

[0035] In the present invention, the solvent preferably includes acetone and DMF, and the volume ratio of the acetone and DMF is preferably 2.8-3.2:1, more preferably 3:1. The present invention does not specifically limit the amount of the solvent used, as long as the PVDF-HFP and PMMA can be fully mixed.

[0036] In the pr...

Embodiment 1

[0048] (1) Using acetone / DMF (volume ratio: 3:1) as solvent, add PVDF-HFP and PMMA particles (mass ratio: 1:1) into a single-necked flask, and stir at 60°C for 4 hours until the solution It is a transparent viscous liquid; stand to remove air bubbles, coat a film on a glass plate, and place it in a vacuum drying oven for 12 hours at 60°C to obtain a PVDF-HFP / PMMA film;

[0049] (2) Add 2g of carboxymethylcellulose (CMC), 50mL of water and 2.5mL of DMF into a single-necked flask, and stir at a constant temperature of 60°C for 4h until the solution becomes a transparent viscous liquid to obtain a CMC solution; stand to remove air bubbles , spread the PVDF-HFP / PMMA film on a glass plate, apply a layer of CMC solution on the PVDF-HFP / PMMA film with a spreader, and place it in a vacuum drying oven for 12 hours at 60°C for 50 seconds to obtain PVDF-HFP / PMMA / CMC composite membrane.

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Abstract

The invention provides a PVDF-HFP / PMMA / CMC composite membrane and a preparation method thereof, which belong to the technical field of composite membranes, and include PVDF-HFP / PMMA thin films and CMC thin films arranged in layers. The composite membrane of the present invention can store more ions, improve the liquid absorption rate and liquid retention rate, and the more electrolyte solution absorbed, the corresponding free Li + The greater the number, the smaller the bulk resistance of the composite membrane, and the greater the corresponding ionic conductivity. The data of the embodiment shows: the crystallinity of the composite film is low, the ion conductivity reaches 4.388mS / cm, and the electrochemical stability window is 4.8V; the first discharge specific capacity of the half-cell assembled by the composite film is 162.5mAh / g; After 100 cycles, the capacity retention rate is 86.22%. When the current rate is 2C, the discharge specific capacity of the composite film is 139.7mAh / g; the composite film can be safely applied to lithium batteries.

Description

technical field [0001] The invention relates to the technical field of composite membranes, in particular to a PVDF-HFP / PMMA / CMC composite membrane and a preparation method and application thereof. Background technique [0002] PVDF-HFP (polyvinylidene fluoride-hexafluoropropylene) has the characteristics of low crystallinity, which can form more pores and larger free volume, and is currently one of the most commonly used materials for preparing gel polymer electrolyte membranes. PMMA has an ester structure similar to the organic solvent in the liquid electrolyte, which can improve the wetting performance of the blended separator to the electrolyte, and PMMA has better interface stability to the lithium electrode, and the interface impedance with the metal lithium electrode is low. Mixing the PMMA component into the PVDF-HFP membrane can not only reduce the crystallinity of PVDF-HFP, but also increase the free volume and porosity of the electrolyte supported by the blended m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/449H01M50/44H01M50/411H01M50/403H01M10/0525H01M50/414H01M50/417
CPCH01M10/0525H01M50/449H01M50/411H01M50/44H01M50/403Y02E60/10
Inventor 李小康彭光怀陈丽萍苑举君李斌
Owner GANNAN NORMAL UNIV
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