Heat-conducting lithium ion diaphragm and preparation method thereof

A lithium ion and separator technology, applied in the field of battery separator preparation, can solve the problems of excessive heat that cannot be effectively and quickly dissipated, battery safety performance attenuation, etc., and achieve the effects of high difficulty in dispersion, improved electrochemical performance, and good physical and chemical properties

Pending Publication Date: 2022-03-04
SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention focuses on solving the problems of battery safety and performance attenuation caused by the excessive heat inside the lithium battery that cannot be effectively and quickly dissipated, develops a new type of lithium ion separator, and pioneers the introduction of an aluminum nitride coating material

Method used

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  • Heat-conducting lithium ion diaphragm and preparation method thereof
  • Heat-conducting lithium ion diaphragm and preparation method thereof
  • Heat-conducting lithium ion diaphragm and preparation method thereof

Examples

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preparation example Construction

[0038] Another embodiment of the present invention is a method for preparing a thermally conductive lithium-ion separator, which is mainly divided into three steps: provision of wet base film—preparation of coating slurry—slurry coating. For more details, please refer to image 3 , which is a specific flow chart illustrating the preparation method of this embodiment, the method includes steps:

[0039] 1) providing a base film;

[0040] 2) mixing ceramic particles and aluminum nitride to obtain a mixed slurry; and

[0041] 3) Coating the mixed slurry on at least one surface of the base film to obtain the thermally conductive lithium ion diaphragm, wherein the mixed slurry is coated at a coating speed by a wire rod or a gravure roll Cloth, the coating speed is between 50m / min-80m / min.

[0042] In some preferred embodiments, the method further comprises the steps of:

[0043] 4) drying the lithium ion diaphragm, the drying temperature is between 70 ° C and 100 ° C; specifical...

Embodiment 1

[0073] Provide base film: In this example, the provided PE base film is prepared according to the conventional wet process. The base film obtained by this process has high porosity, uniform pore size, high mechanical strength, good safety and can be prepared in thickness Ultra-thin products; in this example, the thickness of the base film is preferably 9 μm and the porosity is 50%. The preparation process of the base film of this thickness is mature, the consistency of the diaphragm is good, the porosity can be adjusted arbitrarily, and it has outstanding mechanical properties and safety performance .

[0074] Preparation of coating slurry: water and carboxymethyl cellulose (Carboxymethyl Cellulose, CMC) are mixed in a ratio of 100:1 to 100:5, and water and CMC are mechanically stirred to obtain a transparent and clear CMC solution. Next, mix ceramic particles and aluminum nitride particles at a weight ratio of 6:1, add them to the CMC solution in batches, and then stir at a c...

Embodiment 2

[0083] The steps of the preparation method are the same as in Example 1, please refer to Table 1, but the following preparation conditions are different:

[0084] The dry weight ratio of organic solvent to inorganic particles is 5.5%.

[0085] The weight ratio of ceramic particles to aluminum nitride is 1:1.5.

[0086] The D50 of aluminum nitride particles is 4μm, and the weight per unit area is 3g / m 2 .

[0087] Ceramic particle D50 is 0.6μm, specific surface area is 10m 2 / g.

[0088] The thermally conductive lithium ion separator prepared in Example 2 has a thermal conductivity of 175W / m K, a thermal shrinkage coefficient of 6% (MD) and 5% (TD) respectively, a moisture content of 679ppm, and an internal resistance of 1.38Ω*cm 2 .

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Abstract

The invention discloses a heat-conducting lithium ion diaphragm and a preparation method, the heat-conducting lithium ion diaphragm comprises a wet-process base membrane and a coating, the coating provided by the invention comprises ceramic particles and aluminum nitride inorganic particles, and the ceramic particles and the aluminum nitride inorganic particles are mixed and bonded through an organic binder. Compared with a single aluminum oxide or boehmite ceramic coating, aluminum nitride particles are introduced on the basis, so that the heat conduction performance of the lithium ion diaphragm is greatly improved, and the heat conduction performance and the comprehensive performance of the diaphragm can be improved by controlling the amount of aluminum nitride; and the heat-conducting property, the battery safety performance and other electrochemical properties of the finally prepared heat-conducting diaphragm are effectively improved.

Description

technical field [0001] The application belongs to the field of separators, and in particular relates to a method for preparing a battery separator using heat-conducting particles mixed with a ceramic coating. Background technique [0002] With the rapid development of new energy vehicles, the widespread application of lithium-ion batteries is accelerating. In order to completely replace traditional fuel vehicles, lithium-ion batteries need to solve the problems of cruising range and charging time, and lithium-ion batteries have energy density, capacity and power density. The promotion of fast charging technology has also become an important development direction of the lithium-ion battery market. During the rapid charge and discharge process of lithium-ion batteries, a large amount of heat will be generated inside and it is difficult to dissipate it evenly and effectively, which will cause accelerated attenuation and other safety problems, hinder the development of new energ...

Claims

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Application Information

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IPC IPC(8): H01M50/40H01M50/403H01M50/431H01M50/449
CPCH01M50/40H01M50/403H01M50/431H01M50/449Y02E60/10
Inventor 庄志唐亚奇齐岭王伟强王康刘倩倩程跃
Owner SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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