High-cohesiveness water-based PVDF slurry and preparation method and application thereof

A high-adhesive, water-based technology, applied to structural parts, non-aqueous electrolyte batteries, battery pack components, etc., can solve the problem of poor bonding between the composite diaphragm and the positive and negative electrodes of the battery, and the increase in the tortuosity of the aperture of the composite diaphragm , Inconsistent coating porosity and other problems, to achieve good adhesion, reduce liquid absorption rate, and improve battery performance

Active Publication Date: 2020-04-10
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of coating the multilayer structure of the above two separators, the thickness of the separator coating is virtually increased, and the porosity of the coating is inconsistent, which increases the tortuosity of the pore diameter of the composite separator, resulting in an increase in the internal resistance of the lithium battery. The electrochemical performance is reduced, and the bonding performance between the composite separator and the positive and negative electrodes of the battery is poor, and the battery performance cannot achieve the desired effect

Method used

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  • High-cohesiveness water-based PVDF slurry and preparation method and application thereof
  • High-cohesiveness water-based PVDF slurry and preparation method and application thereof

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preparation example Construction

[0032] The preparation method of above-mentioned aqueous PVDF slurry, comprises the following steps:

[0033] S1. Add silicon carbide and dispersant to water, and ultrasonically disperse to obtain suspension A; S2. Add PVDF, anti-sedimentation agent, and defoamer to suspension A, stir at room temperature, and the stirring rate is 100-200r / min, the stirring time is 30-40min, to obtain the mixed solution B; S3, add the binder and wetting agent into the mixed solution B, and stir at room temperature to obtain a highly cohesive water-based PVDF slurry. The following examples and comparative examples adopt this method to prepare water-based PVDF slurry.

Embodiment 1

[0035] A highly cohesive water-based PVDF slurry, including the following raw materials in weight percentage: 7% sodium tripolyphosphate, 5% sodium alkylaryl sulfonate, 5% acrylic binder, 3% high-carbon alcohol fat Ester compound, 0.1% polyamide wax, 15% PVDF and 0.05% silicon carbide, the balance is water, the amount of added silicon carbide and the added amount of PVDF are 1:300 by mass ratio.

Embodiment 2

[0037] A highly cohesive water-based PVDF slurry, including the following raw materials in weight percentage: 6% sodium hexametaphosphate, 4% sodium butylnaphthalene sulfonate, 6% acrylic binder, 2% polyoxyethylene polyoxygen Propylene pentaerythritol ether, 0.5% polyamide wax, 20% PVDF and 0.2% silicon carbide, the balance is water, and the addition amount of the silicon carbide and PVDF is 1:100 by mass ratio.

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Abstract

The invention belongs to the technical field of lithium ion battery diaphragm production, and especially relates to high-cohesiveness water-based PVDF slurry and a preparation method and application thereof. The high-cohesiveness water-based PVDF slurry specifically comprises the following raw materials in percentage by weight: 3-7% of a dispersing agent, 1-5% of a wetting agent, 5-10% of an auxiliary binding agent, 0.5-3% of a defoaming agent, 0.1-3% of an anti-settling agent, 15-25% of PVDF and 0.05-2.5% of silicon carbide, the balance being water, wherein the mass ratio of the addition amount of the silicon carbide to the addition amount of the PVDF is 1:(10-300). The SiC is uniformly dispersed in a PVDF long chain to form a lot of microcapacitive structures. By means of the high heat conduction capacity and bridged effect of the SiC, the external heat can be rapidly transferred into the PVDF slurry to speed up the binding of the PVDF slurry so as to improve the binding performanceof the water-based PVDF slurry , and the water-based PVDF slurry with thin coating and good binding is obtained.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery diaphragm production, in particular to a highly cohesive water-based PVDF slurry, a preparation method and an application thereof. Background technique [0002] The separator is an essential key material for the electrode. Although it does not participate in the electrochemical reaction in the battery, the key properties of the battery, such as capacity, cycle performance, and charge-discharge current density, are directly related to the separator. The overall performance of lithium batteries plays an important role. The separator mainly plays the role of connecting the electrode active material, the conductive agent and the electrode collector, and maintains the integrity of the electrode structure. In lithium batteries, after the separator absorbs the electrolyte, it can isolate the positive and negative electrodes to prevent short circuits, but at the same time Allows conduction of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14
CPCH01M50/403H01M50/431H01M50/446H01M50/411Y02E60/10H01M50/449C08L27/16C08K3/14C08J3/20C08J5/2237H01M10/052
Inventor 王成豪李正林贡晶晶张立斌尚文滨
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
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