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Composite diaphragm with high conductivity material layer and preparation method thereof

A composite diaphragm, high thermal conductivity technology, applied in the field of electrochemistry, can solve the problems of local thermal diffusion obstruction, poor thermal conductivity of the diaphragm, easy to catch fire and burn, etc., and achieve the effect of large-scale application, high flexibility, and rapid heat conduction.

Inactive Publication Date: 2019-06-07
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the one hand, when the traditional lithium-ion battery is abused, the poor thermal conductivity of the traditional diaphragm is the main obstacle to the internal thermal diffusion of the lithium-ion battery, which hinders the local thermal diffusion, causing a chain reaction to cause thermal runaway, easy to catch fire and even explode. Therefore, insulating and fast thermally conductive lithium-ion battery separators have become an important technology choice to solve the safety problem of lithium-ion batteries

Method used

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  • Composite diaphragm with high conductivity material layer and preparation method thereof
  • Composite diaphragm with high conductivity material layer and preparation method thereof

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preparation example Construction

[0025] A method for preparing a composite diaphragm with a high thermal conductivity material layer. Select mixed high thermal conductivity nano-materials, configure a coating slurry, and use a micro-gravure coating process to coat a thermal conductive material layer on the surface of a polymer diaphragm. The specific steps are as follows :

[0026] Step 1, using inorganic heat-conducting nano-materials, binders, dispersants, solvents, etc. to mix evenly to prepare coating slurry;

[0027] Step 2. Use the micro-gravure coating process to coat the diaphragm on one or both sides; the coating speed is 5-30 m / min, the coating thickness is 0.1-5 microns, the drying temperature is 50-100 ° C, and the The time is 1-60 minutes;

[0028] Step 3, composite diaphragm drying, heat setting and winding.

[0029] The thickness of the polymer diaphragm is 5-50 microns, and the thickness of the single-layer inorganic nano material layer is 0.1-5 microns. The inorganic nanomaterial layer ado...

Embodiment 1

[0031] A method for preparing a high thermal conductivity composite diaphragm, the steps are as follows:

[0032] Proceed as follows:

[0033] In the first step, a polyethylene (PE) 12-micron thick diaphragm is selected as the coating base film. The coating slurry was prepared by using inorganic thermally conductive nanomaterials (hexagonal boron nitride), binder PAN / LiTFSI (80 / 20), dispersant PVP, and solvent NMP. The percentage by weight of the solid raw materials for the coating slurry is distributed as follows: 84% of the inorganic nano heat-conducting material, 15% of the binder, and 1% of the dispersant. The solvent of the slurry is NMP, and the solid content of the slurry is 10%. Use a centrifugal disperser to fully mix and disperse the above mixture evenly to obtain a mixed slurry;

[0034] The second step is to use the micro-gravure coating method to coat the separator on both sides. The coating speed is 20 m / min, the coating thickness on one side is 2 microns, the...

Embodiment 2

[0037] A method for preparing a high thermal conductivity composite diaphragm, the steps are as follows:

[0038] Proceed as follows:

[0039]In the first step, a polypropylene (PP) 16-micron thick separator is selected as the coating base film. The coating slurry was prepared by using inorganic heat-conducting nanomaterials (mixed materials of hexagonal boron nitride and alumina), binder PAN / LiTFSI (80 / 20), dispersant PVP, solvent NMP, etc. The percentage by weight of the solid raw materials for the coating slurry is distributed as follows: 84% of the inorganic nano heat-conducting material, 15% of the binder, and 1% of the dispersant. The solvent of the slurry is NMP, and the solid content of the slurry is 15%. Use a centrifugal disperser to fully mix and disperse the above mixture evenly to obtain a mixed slurry;

[0040] The second step is to use the micro-gravure coating method to coat the diaphragm on one side. The coating speed is 20 m / min, the thickness of the singl...

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Abstract

The present invention relates to a composite diaphragm with a high conductivity material layer. The composite diaphragm comprises a composite diaphragm main body consisting of a polymer diaphragm andan inorganic nanometer material layer, the polymer diaphragm constructs the polymer diaphragm main body structure bearing and fixes the inorganic nanometer material layer, and the inorganic nanometermaterial layer coats one-side surface or two-sides surfaces of the polymer diaphragm. The preparation method of the composite diaphragm with the high conductivity material layer comprises the steps of: selecting mixed high conductivity nanometer materials, configuring coating slurry, and employing a micro-concave coating process to perform coating of a thermal conductivity material layer at the surface of the polymer diaphragm. The composite diaphragm with the high conductivity material layer has the insulativity, high thermal conductivity feature and the high mechanical strength of the thermal conductivity material and the flexibility, the insulativity and the ion permeability of the polymer diaphragm material to achieve the chemical inertness, the fast heat conduction and the high strength mechanics of the composite heat conduction diaphragm with high heat conduction and high mechanical strength.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a composite diaphragm with a high thermal conductivity material layer and a preparation method thereof. Background technique [0002] During the use of lithium-ion battery cells, modules or systems, internal short circuits or internal heat accumulation will occur under overcurrent, overcharge, internal lithium dendrites, extrusion, mechanical impact, puncture or other abuses. When the heat generated locally in the battery cannot be quickly diffused and discharged, when the heat accumulates to a certain extent, an exothermic chain reaction will occur, triggering an exothermic reaction of materials such as the negative electrode, positive electrode, electrolyte, and separator on a large area, and eventually lead to heat generation in the lithium-ion battery. out of control. [0003] The heat dissipation performance of lithium-ion batteries is mainly affected by the ther...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCY02E60/10
Inventor 孟繁慧郑涛谢富国周江伍绍中
Owner TIANJIN LISHEN BATTERY
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