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

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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Comparison scheme
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Example Embodiment

[0038] Another embodiment of the present invention a method of preparing thermally conductive line separator of a lithium ion, is divided into the base film to provide a wet - Preparation of a coating slurry - slurry was applied in three steps, more specifically, see image 3 Which system describes flow chart of a specific embodiment of this method, the method comprising the steps of:

[0039] 1) Provide a base film;

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

[0041] 3) The mixed slurry was applied to the base film of at least one surface of the heat conducting lithium ions to obtain a diaphragm, wherein said slurry mixing bar or gravure roll manner with a coating speed coating cloth, the coating speed of between 50m / min-80m / min.

[0042] In some preferred examples, the method further comprising the step of:

[0043] 4) drying the lithium ion diaphragm, the temperature of the drying medium at 70 ℃ -100 ℃; Specifically, the mixed slurry...

Example Embodiment

[0072] Example 1

[0073] Providing a base film: In the present embodiment, PE base film prepared in a conventional system provided in accordance with a wet process, the process using the obtained base film has a high porosity, uniform pore size, high mechanical strength, good safety and thickness can be prepared ultra-thin; in the present embodiment, the base film thickness is preferably 9 m, a porosity of 50%, the thickness of the base film prepared mature technology, good consistency separator, the porosity can be arbitrarily regulated, and have outstanding mechanical properties and safety .

[0074] Preparation of coating slurry: water and carboxymethyl cellulose (Carboxymethyl Cellulose, CMC) at a ratio of 100: 1 to 100: in the range of 5 were mixed and mechanically stirred to obtain a transparent clear water and CMC CMC solution. Subsequently, the ceramic particles and aluminum nitride particles in a weight ratio of 6: 1 mixture of CMC solution was added portionwise, follow...

Example Embodiment

[0082] Example 2

[0083] Prepared in Example 1 step, see Table 1, but the following preparation conditions are different:

[0084] Organic solvent with an inorganic particulate dry weight ratio of 5.5%.

[0085] Aluminum nitride ceramic particles with a weight ratio of 1: 1.5.

[0086] D50 of the aluminum nitride particles 4μm, a weight of 3g / m 2 .

[0087] Ceramic particles D50 of 0.6μm, a specific surface area of 10m 2 / g.

[0088] Thermal conductivity of lithium ions of the separator prepared in Example 2 embodiment, the thermal conductivity of 175W / m · K, coefficient of thermal shrinkage of 6%, respectively (MD), 5% (TD), a water content of 679ppm, 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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