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Lithium battery diaphragm and preparation method thereof

A lithium battery separator, lithium battery technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of porous membrane ion passage hindering, affecting battery capacity and efficiency, etc., to achieve stable heating and moisture absorption. The effect of uniformity, improving production efficiency and simple process

Active Publication Date: 2018-09-21
SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the dense network structure, the ion passage of the porous membrane is greatly hindered, so this kind of lithium battery separator cannot have excellent gas permeability while having high heat resistance, thus affecting the capacity and efficiency of the battery.

Method used

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  • Lithium battery diaphragm and preparation method thereof
  • Lithium battery diaphragm and preparation method thereof
  • Lithium battery diaphragm and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0025] Usually aromatic polymers such as aromatic aromatic amide with excellent heat resistance are difficult to prepare a coating film with a stable structure, many mesh holes and uniformity due to improper molding process, and thus it is impossible to make the lithium battery separator have high heat resistance. It also has excellent breathability. In view of this, the present invention provides a lithium battery separator and a preparation method thereof, capable of stably manufacturing an aromatic polymer coated film lithium ion battery separator, ensuring heat resistance and having high air permeability.

[0026] Such as figure 1 As shown, the present invention provides a kind of preparation method of lithium battery diaphragm, and described preparation method comprises at least:

[0027] Firstly, step S1 is performed, adding aromatic polymer and ceramic powder into a solvent to dissolve, so as to prepare an aromatic polymer slurry.

[0028] In this step, the aromatic p...

Embodiment 1

[0053] Take a lithium battery base film with a thickness of 14 μm, and use an automatic coating machine to evenly coat the prepared coating slurry on one side of the base film at a coating speed of 80 m / min. Put it in a constant temperature water bath at 30° C. for 2 minutes, then take it out and dry to obtain an aromatic polymer-coated lithium-ion battery separator, and the coating thickness of the lithium-ion battery separator is 4 μm.

Embodiment 2

[0055] The same operation as in Example 1 was performed except that the constant temperature water bath was 40°C. A lithium-ion battery separator coated with an aromatic polymer can be obtained, and the coating thickness of the lithium-ion battery separator is 4 μm.

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Abstract

The invention provides a lithium battery diaphragm and a preparation method thereof. The method includes the steps that 1, an aromatic polymer and ceramic powder are added into a solvent to be dissolved to prepare aromatic polymer slurry; 2, the surface of a lithium battery base membrane is coated with the aromatic polymer slurry; 3, the structure obtained in step 2 is subjected to constant-temperature water bath washing and then dried to obtain the lithium battery diaphragm. According to the preparation method, after the surface of the base membrane is coated with the aromatic polymer slurry,the net-shaped morphology of fibers is crystallized and separated out at a proper speed, and a three-dimensional net-shaped fiber structure is formed. The stereoscopic net-shaped fiber structure serves as a framework, so that the aromatic polymer coating membrane has excellent heat resistance; in addition, net holes in the three-dimensional net-shaped fiber structure enable the diaphragm to haverelatively high air permeability. Compared with the prior art, a temperature and humidity processing link is omitted, the process flow is simplified, the production efficiency is improved, the production cost is reduced, and manpower and material resources are saved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a high-safety and high-permeability lithium battery separator and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, high working voltage, no memory effect and long cycle life, so they are widely used as power sources for various mobile devices. favor. With the extensive application of lithium secondary batteries in electric vehicles, high capacity, high output, and high safety have become the development direction of power batteries. Correspondingly, lithium battery separators are also constantly developing in the direction of high heat resistance, high safety, and high ion permeability. [0003] Lithium-ion batteries are usually mainly composed of positive electrodes, negative electrodes, separators, electrolytes, and battery casings. In the lithium-ion battery structure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/446H01M50/491
CPCH01M10/0525H01M50/431H01M50/411H01M50/44H01M50/403H01M50/449Y02E60/10
Inventor 程跃杨文科
Owner SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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