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Ceramic diaphragm with multi-layer composite structure and battery using ceramic diaphragm

A multi-layer composite and ceramic diaphragm technology, which is applied in the direction of secondary batteries, structural parts, battery pack parts, etc., can solve the problems of unsafe applications, affecting battery cycle performance, and degradation of diaphragm mechanical properties, etc., to achieve excellent Effects of thermal stability and mechanical properties, improvement of battery cycle performance, and improvement of battery cycle life

Pending Publication Date: 2021-08-06
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, as the temperature rises, after the polyolefin base film melts, the mechanical properties of the separator drop significantly, the membrane breaks, and even cannot support the film formation.
Obviously, this cannot meet the needs of applications requiring high security
A ceramic diaphragm is introduced to improve the safety of the battery. The poor adhesion between the ceramic diaphragm and the positive and negative electrodes and the presence of residual gas will lead to an increase in internal resistance and affect the cycle performance of the battery.

Method used

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  • Ceramic diaphragm with multi-layer composite structure and battery using ceramic diaphragm
  • Ceramic diaphragm with multi-layer composite structure and battery using ceramic diaphragm
  • Ceramic diaphragm with multi-layer composite structure and battery using ceramic diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1. A ceramic diaphragm with a multi-layer composite structure in this embodiment is prepared as follows:

[0048] 1) Preparation of ceramic coated diaphragm:

[0049] Fully mix silica spherical powder with a particle size of about 300nm, binder (styrene-butadiene rubber (SBR), carboxymethyl cellulose (CMC)) to make a slurry, and its mass ratio is: silica / SBR / CMC=0.95g / 0.03g / 0.02g, the solvent is a water / ethanol mixture with a volume ratio of 1:1, and the mass ratio of liquid to solid is 90:10.

[0050] The prepared slurry was evenly coated on both sides of a commercial polyethylene (PE) separator with an automatic coating machine, and after drying at room temperature, it was dried in vacuum at 50° C. for 10 hours to obtain a silica ceramic coated separator.

[0051] 2) Preparation of a ceramic diaphragm with a three-dimensional composite structure:

[0052] Use a water / ethanol mixture with a volume ratio of 1:1 as a solvent to prepare a water-soluble phenolic resin s...

Embodiment 2

[0061] The difference between embodiment 2 and embodiment 1 is:

[0062] 1) Preparation of ceramic coated diaphragm:

[0063] Fully mix alumina powder with a particle size of 300nm and a binder (polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP)) to make a slurry, the mass ratio of which is: alumina / PVDF-HFP=0.9g / 0.1g, the solvent is NMP / acetone mixed solution with a volume ratio of 1:1, and the mass ratio of liquid to solid is 90:10.

[0064] The prepared slurry was evenly coated on one side of a commercial polyethylene (PE) separator with an automatic coating machine, and after drying at room temperature, it was dried in vacuum at 50° C. for 10 hours to obtain an alumina ceramic coated separator.

[0065] 2) Preparation of a ceramic diaphragm with a multilayer composite structure:

[0066] Use a water / ethanol mixture with a volume ratio of 1:1 as a solvent to prepare a water-soluble phenolic resin solution with a mass fraction of 15 g / L and a molecular weight of 3000....

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Abstract

The invention discloses a ceramic diaphragm with a multilayer composite structure and a battery using the ceramic diaphragm. The ceramic diaphragm with the multi-layer composite structure comprises an organic microporous base material, a ceramic coating layer, a three-dimensional high-temperature-resistant layer and a polymer layer; the ceramic coating layer is attached to one surface or two surfaces of the organic microporous base material, the thickness of the ceramic coating layer is 0.1-50 microns, the ceramic coating layer comprises inorganic powder and a binder, and the particle size of the inorganic powder is 5nm-50 microns; holes are distributed in the organic microporous base material; the three-dimensional high-temperature-resistant layer continuously coats the surface of the ceramic coating layer and the inner walls of the holes and comprises a high-temperature-resistant polymer and a curing cross-linking agent, and the high-temperature-resistant polymer comprises phenolic resin, urea resin, polyimide or epoxy resin; the thickness of the polymer layer is 5nm-10mu m, and the polymer layer coats on the surface of the three-dimensional high-temperature-resistant layer. The ceramic diaphragm has good adhesion with positive and negative electrodes, and the battery with the ceramic diaphragm has the advantages of high safety, long service life and the like.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a multilayer composite structure ceramic diaphragm and a battery thereof. Background technique [0002] Due to the advantages of high energy density and good cycle performance, lithium-ion batteries have been widely used in portable devices. The separator is a microporous film placed between the positive and negative electrodes of the battery, through which ions can pass freely while blocking the direct contact between the positive and negative electrodes. At present, the main commercial separator materials are mainly porous polymer films of polyolefins. When a large lithium-ion battery using this separator material is in an abuse state (internal partial short circuit, external short circuit, overcharge, etc.), it is easy to induce high temperature inside the battery. Due to the low melting temperature of polyolefin (about 130°C for polyethylene and 160°C for pol...

Claims

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Application Information

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IPC IPC(8): H01M50/449H01M50/434H01M50/457H01M50/414H01M50/417H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 赵金保胡特雄张鹏
Owner XIAMEN UNIV
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