Composite coating diaphragm with uniform pore size and preparation method thereof

A composite coating and coating technology, which is applied to structural parts, electrical components, battery pack parts, etc., can solve the problems of increasing the volume and quality of the diaphragm, reducing the energy density of the battery, and decreasing the electrical performance of the battery, so as to improve the cycle life and charge and discharge efficiency, reduce battery internal resistance, and improve heat resistance

Active Publication Date: 2020-11-10
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, the double-layer coating increases the volume and quality of the separator and reduces the energy density of the battery; the simple mixed single-layer coating is only a compromise between heat resistance and electrode adhesion, and the performance of both aspects has not been greatly improved. good improvement
At the same time, both methods change the structure of the overall diaphragm hole, which increases the internal resistance of the battery, resulting in a decrease in the electrical performance of the battery.

Method used

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  • Composite coating diaphragm with uniform pore size and preparation method thereof
  • Composite coating diaphragm with uniform pore size and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] See figure 1 , the present embodiment 1 provides a composite coated diaphragm, comprising: a base film 1 and a composite coating 2 coated on the surface of the base film; and the composite coating 2 contains polymer composite particles 3 and a ceramic composite Particles 4, so that the pore size of the micropores in the composite coating 2 is consistent with that of the base film 1.

[0024] Optionally, the mass ratio of the polymer composite particles 3 to the ceramic composite particles 4 is 1:(0.5-20), optionally 1:5 or 1:10.

[0025] Optionally, the base film 1 includes a polypropylene film, a polyethylene film or a multilayer composite film of the two; and the base film contains micropores with a pore size of 0.01 μm-0.8 μm.

[0026] Optionally, the polymer composite particles 3 include: polymer particles of at least two particle sizes, the particle size ranges are 0.1 μm-4 μm and 4-8 μm respectively; and the mass ratio of the two is 1:(0.1-10 ). The polymer com...

Embodiment 2

[0030] like figure 2 As shown, on the basis of Example 1, this Example 2 also provides a method for preparing a composite coating separator, including: preparing a composite coating slurry; coating the composite coating slurry on the surface of the base film; and drying to obtain a composite coated separator.

[0031] Specifically, the composite coating slurry includes the following raw materials in parts by mass: deionized water: 50-95 parts; polymer composite particles: 1-40 parts; ceramic composite particles: 1-45 parts; binder: 1-20 parts; dispersant: 0.1-25 parts; wetting agent: 0.1-15 parts; stabilizer: 0.5-30 parts; and other additives: 0.1-10 parts.

[0032] Optionally, the composite coating slurry includes the following raw materials in parts by mass: deionized water: 80 parts; polymer composite particles: 20 parts; ceramic composite particles: 25 parts; binder: 15 parts; dispersant : 5 parts; wetting agent: 12 parts; stabilizer: 20 parts; and other additives: 8 pa...

Embodiment 3

[0037] 65 parts of deionized water, 0.91 parts of the first polymer particles, 0.19 parts of the second polymer particles, 3.64 parts of the first ceramic particles, 0.36 parts of the second ceramic particles, 4 parts of binders, 3 parts of dispersants, 2 parts Wetting agent, 3 parts of stabilizer, and 3 parts of other additives are mixed uniformly to prepare composite coating slurry.

[0038] The particle size of the first polymer particle is 0.1 μm, the particle size of the second polymer particle is 4 μm, the mass ratio of the two is 1:0.1, the initial particle size of the polymer is 0.1-0.5 μm; the particle size of the first ceramic particle is 0.1 μm, The particle size of the second ceramic particles is 0.6 μm, and the ratio thereof is 1:0.1; wherein, the mass ratio of the polymer particles to the ceramic particles is 1:4.

[0039]The polyethylene film was used as the substrate, and the composite coating slurry was coated by a top coating process, wherein the top coating ...

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Abstract

The invention belongs to the technical field of lithium battery diaphragms, and particularly relates to a composite coating diaphragm with consistent pore diameters and a preparation method thereof. The composite coating diaphragm comprises a base membrane and a composite coating coated on the surface of the base membrane, and the composite coating contains polymer combined particles and ceramic particles, so that the pore diameter of micropores in the composite coating is kept consistent with that of the base membrane. The composite coating comprises polymer combined particles and ceramic particles in a specific proportion, the pore diameter of the composite coating is consistent with that of a base membrane, the heat resistance, electrolyte affinity and binding power with a positive plate and a negative plate of the battery are improved, the internal resistance of the battery is reduced, the cycle life of the battery is prolonged, and the charging and discharging efficiency of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium battery diaphragms, and in particular relates to a composite coating diaphragm with uniform pore diameter and a preparation method thereof. Background technique [0002] Due to the poor adhesion between the separator and the pole piece of the lithium-ion battery, the separator and the pole piece are easily separated during the charging and discharging process of the lithium-ion battery, thereby reducing the performance such as the cycle life of the battery. At the same time, the diaphragm itself has poor affinity to the electrolyte and poor heat resistance, which leads to poor safety and electrical performance of the lithium-ion battery. Therefore, most of the industry uses ceramic, polymer double-layer coating or mixed single-layer coating to improve the adhesion between the base film and the pole piece, and to improve the electrolyte affinity and heat resistance of the separator. However, the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052
CPCH01M10/052H01M50/403H01M50/411H01M50/431Y02E60/10
Inventor 张立斌李正林贡晶晶翁星星张翰林
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
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