Preparation method of PVDF (Polyvinylidene Fluoride) glue solution

A technology of glue and liquid surface, which is applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of unfavorable dissolution, easy formation of micelles, low solid content and low viscosity, so as to accelerate dissolution, reduce glue making time, Improve glue efficiency and glue uniformity

Pending Publication Date: 2022-07-22
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above two PVDF gluing methods are to add 100% N-methylpyrrolidone (NMP) solvent (commonly used solvent for PVDF glue) and 100% PVDF dry powder into the dissolving device, the overall solid content and viscosity of the gluing process are low , it is easy to form micelles during the gluing process, and they float on the liquid surface, which is not conducive to dissolution

Method used

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  • Preparation method of PVDF (Polyvinylidene Fluoride) glue solution

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Experimental program
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Effect test

Embodiment 1

[0032] The preparation method of a kind of PVDF glue solution that this embodiment 1 provides, comprises the following steps:

[0033] S1: According to the volume of the container and the total weight of the glue to be prepared, add 70% of the N-methyl pyrrolidone solvent required for the glue to the container bottle, so that the liquid level of the N-methyl pyrrolidone solvent is higher than The upper surface of the dispersion plate is 2cm;

[0034] S2: open the dispersion disc located in the container bottle, so that the stirring rate of the dispersion disc is 700rpm / min, and the PVDF dry powder is added to the container bottle at a rate of 2.5kg / min;

[0035] S3: stirring at 700rpm / min for 90min;

[0036] S4: Add the remaining 30% N methyl pyrrolidone solvent into the container bottle and stir for 300 min, the stirring speed is 750 rpm / min, dissolve the small pieces of micelles, and then 1500 L of PVDF glue solution can be obtained.

[0037] The PVDF glue that the present...

Embodiment 2

[0047] The preparation method of a kind of PVDF glue solution that this embodiment 2 provides, comprises the following steps:

[0048] S1: According to the volume of the container and the total weight of the glue to be prepared, add 75% of the N-methyl pyrrolidone solvent required for the glue to the container bottle, so that the liquid level of the N-methyl pyrrolidone solvent is higher than The upper surface of the dispersion plate is 2cm;

[0049] S2: open the dispersion disc located in the container bottle, so that the stirring rate of the dispersion disc is 700rpm / min, and the PVDF dry powder is added to the container bottle at a rate of 2.5kg / min;

[0050] S3: stirring at 700rpm / min for 90min;

[0051] S4: Add the remaining 25% N methyl pyrrolidone solvent to the container bottle and stir for 300 min, the stirring speed is 750 rpm / min, dissolve the small pieces of micelles, and then 1500 L of PVDF glue solution can be obtained.

[0052] The PVDF glue that the present e...

Embodiment 3

[0062] The preparation method of a kind of PVDF glue solution that this embodiment 3 provides, comprises the following steps:

[0063] S1: According to the volume of the container and the total weight of the glue to be prepared, add 75% of the N-methyl pyrrolidone solvent required for the glue to the container bottle, so that the liquid level of the N-methyl pyrrolidone solvent is higher than The upper surface of the dispersion plate is 3cm;

[0064] S2: open the dispersion disc located in the container bottle, so that the stirring rate of the dispersion disc is 750rpm / min, and the PVDF dry powder is added to the container bottle at a rate of 2.5kg / min;

[0065] S3: stirring at 750rpm / min for 90min;

[0066] S4: Add the remaining 25% N methyl pyrrolidone solvent to the container bottle and stir for 300 min, the stirring speed is 750 rpm / min, dissolve the small micelles, and then 1500 L of PVDF glue can be obtained, and the solid content is 6.8% .

[0067] The PVDF glue that...

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Abstract

The invention belongs to the technical field of lithium ion battery preparation, and particularly discloses a preparation method of a PVDF glue solution, which comprises the following steps: S1, adding a solvent into a container bottle, and enabling the liquid level of the solvent to be 2-5cm higher than the upper surface of a dispersion disc; s2, opening a dispersion disc located in the container bottle, and then adding 100% of PVDF dry powder into the container bottle at a constant rate; s3, stirring is conducted at the speed of 700-800 rpm/min; and S4, adding a solvent into the container bottle, stirring, and dissolving the small micelles to obtain the PVDF glue solution. Compared with the conventional preparation method of the PVDF glue solution, the preparation method of the PVDF glue solution provided by the embodiment of the invention has the advantages that the dissolution of the PVDF dry powder is accelerated, the gluing efficiency and the glue solution uniformity are improved, and compared with the conventional preparation method of the PVDF glue solution, the preparation method of the PVDF glue solution provided by the embodiment of the invention has the advantage that the gluing time is greatly shortened.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery preparation, and in particular relates to a preparation method of PVDF glue. Background technique [0002] Polyvinylidene fluoride (abbreviation: PVDF) refers to the homopolymer of vinylidene fluoride (VDF) or the copolymer of VDF and a small amount of fluorine-containing vinyl monomers. The fluorine content is about 60%. It is an important semi-crystalline A polymer material that combines the advantages of fluorine-containing resins and general-purpose resins. [0003] The main application scenarios of PVDF are coatings, injection molding, photovoltaic backsheet films, lithium batteries and water treatment films. In recent years, with the strong demand for lithium batteries, the market demand for battery-grade PVDF as a positive electrode binder has grown rapidly. PVDF is mainly used as positive electrode bonding. agent and diaphragm coating material. [0004] There are two main met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/11C08L27/16H01M4/62
CPCC08J3/11H01M4/623C08J2327/16
Inventor 文晓平覃志华吕智海黄少南郑明清杨山
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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