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A kind of highly cohesive water-based PVDF slurry and preparation method and application thereof

A high-adhesive, water-based technology, applied in 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 , Increase the thickness of the diaphragm coating and other issues to achieve good adhesion, reduce liquid absorption, and improve adhesion performance

Active Publication Date: 2021-09-21
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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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  • A kind of highly cohesive water-based PVDF slurry and preparation method and application thereof
  • A kind of highly cohesive 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 specifically relates to a highly cohesive water-based PVDF slurry, a preparation method and its application, specifically comprising the following raw materials in weight percentage: 3-7% dispersant, 1-5% Wetting agent, 5-10% co-adhesive agent, 0.5-3% defoamer, 0.1-3% anti-settling agent, 15-25% PVDF and 0.05-2.5% silicon carbide, the balance is water, the carbonization The added amount of silicon and the added amount of PVDF are 1:10-300 in terms of mass ratio. By uniformly dispersing SiC in the PVDF long chain, a large number of microcapacitive structures are formed. With the help of SiC's high thermal conductivity and bridging effect, the external heat can be quickly transferred to the inside of the PVDF slurry, and the bonding of the PVDF slurry can be accelerated. Further, the bonding performance of the water-based PVDF slurry is improved, and a water-based PVDF slurry with a thinner coating and better adhesion 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 Patents(China)
IPC IPC(8): H01M50/446H01M50/417H01M50/403
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