Composite coating diaphragm with consistent pore diameter and preparation method thereof

A composite coating and coating technology, which is applied to electrical components, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of reducing battery energy density, increasing diaphragm volume, quality, and battery electrical performance degradation, so as to reduce battery internal resistance , Improve cycle life, charge and discharge efficiency, and improve heat resistance

Active Publication Date: 2020-06-05
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

Method used

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  • Composite coating diaphragm with consistent pore diameter and preparation method thereof
  • Composite coating diaphragm with consistent pore diameter and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1

[0023] see figure 1 , This embodiment 1 provides a composite coating diaphragm, including: 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 to keep the pore size of the composite coating 2 consistent with 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), and may be 1:5 or 1:10.

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

[0026] Optionally, the polymer composite particles 3 include: polymer particles of at least two particle sizes, with particle sizes ranging from 0.1 μm to 4 μm and 4 to 8 μm, respectively; and the mass ratio of the two is 1: (0.1-10 ). The polymer composite par...

Example Embodiment

[0029] Example 2

[0030] Such as figure 2 As shown, on the basis of Example 1, this Example 2 also provides a method for preparing a composite coating diaphragm, 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 diaphragm.

[0031] Specifically, the composite coating slurry includes the following parts by mass of raw materials: 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 parts by mass of raw materials: 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...

Example Embodiment

[0036] Example 3

[0037] Mix 65 parts of deionized water, 0.91 parts of first polymer particles, 0.19 parts of second polymer particles, 3.64 parts of first ceramic particles, 0.36 parts of second ceramic particles, 4 parts of binder, 3 parts of dispersant, 2 parts of The wetting agent, 3 parts of stabilizer, and 3 parts of other additives are mixed uniformly to prepare a composite coating slurry.

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

[0039] Using polyethylene film as the substrate, the composite coating slurry was coated by a top coating process, where the top coating process was micro-gravur...

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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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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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