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Lithium ion battery separator and preparation method thereof

A lithium-ion battery and diaphragm technology, applied in the field of lithium-ion battery diaphragm and its preparation, can solve the problems of poor bonding performance of the diaphragm, achieve improved bonding performance, stable slurry performance, and no change in coating properties Effect

Inactive Publication Date: 2018-11-13
ZHUHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the object of the present invention is to provide a lithium-ion battery separator and a preparation method thereof, which are used to solve the problem of poor adhesion of the separator in the prior art

Method used

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  • Lithium ion battery separator and preparation method thereof
  • Lithium ion battery separator and preparation method thereof
  • Lithium ion battery separator and preparation method thereof

Examples

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preparation example Construction

[0035] Such as figure 1 As shown, the present invention provides a kind of preparation method of lithium-ion battery diaphragm, and described preparation method comprises at least:

[0036] S1, adding the inorganic powder and the first dispersing additive into the first deionized water, stirring evenly and grinding, then adding the thickening additive and the first binder in turn, mixing and stirring evenly, and preparing a ceramic slurry;

[0037] S2, adding polyvinyl chloride into the second deionized water, mixing evenly, adding the second binder and the second dispersing auxiliary agent, stirring, and preparing water-based polyvinyl chloride slurry;

[0038] S3, providing a base film, coating the ceramic slurry on at least one side surface of the base film and drying to form a ceramic layer, and then coating the water-based slurry on the surface of the ceramic layer and / or the base film The polyvinyl chloride slurry is dried to form a water-based polyvinyl chloride layer,...

Embodiment 1

[0062] A. Preparation of water-based slurry: Add 4 parts by mass of dispersing additive and 32 parts by mass of alumina powder into 54 parts by mass of deionized water and stir until completely dispersed and ground, then add 5 parts by mass of thickening type Continue to stir the additives until they are completely dispersed, and finally add 5 parts by mass of adhesive and continue to stir until they are completely mixed to obtain a water-based ceramic slurry; add 20 parts by mass of polyvinyl chloride powder to 60 parts by mass of deionized water and mix well before adding 8 parts by mass of the adhesive and 12 parts by mass of the dispersing additive were stirred evenly until completely mixed to obtain a polyvinyl chloride slurry. The mass ratio of alumina powder to polyvinyl chloride powder is 8:1.

[0063] B. Preparation process of lithium-ion battery ceramic composite diaphragm: Use a coating machine to uniformly coat ceramic slurry and polyvinyl chloride slurry on one si...

Embodiment 2

[0065] A. Preparation of water-based slurry: Add 4 parts by mass of dispersing additive and 32 parts by mass of alumina powder into 54 parts by mass of deionized water and stir until completely dispersed and ground, then add 5 parts by mass of thickening type Continue to stir the auxiliary agent until it is completely dispersed, and finally add 5 parts by mass of adhesive and continue to stir until it is completely mixed to obtain a water-based ceramic slurry; add 60 parts by mass of polyvinyl chloride aqueous solution emulsion to 20 parts by mass of deionized water and mix well before adding 8 parts by mass of the adhesive and 12 parts by mass of the dispersing additive were stirred evenly until completely mixed to obtain a polyvinyl chloride slurry. The mass ratio of alumina powder to polyvinyl chloride in polyvinyl chloride emulsion is 8:1.

[0066] B. Preparation process of lithium-ion battery ceramic composite diaphragm: Use a coating machine to uniformly coat ceramic slu...

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Abstract

The invention provides a lithium ion battery separator and a preparation method thereof. The preparation method at least comprises the following steps: adding inorganic powder and a first dispersing type accessory ingredient into first deionized water, stirring uniformly and grinding, and then adding a thickening type accessory ingredient and a first binding agent to be uniformly stirred in sequence so as to prepare a ceramic sizing agent; adding polyvinyl chloride into second deionized water, after uniform mixing, adding a second binding agent and a second dispersing type accessory ingredient, and stirring to prepare a water-based polyvinyl chloride sizing agent; providing a basement membrane, coating at least one side surface of the basement membrane with the ceramic sizing agent and drying to form a ceramic layer; then, coating the surface of the ceramic layer and / or the surface of the basement membrane with the water-based polyvinyl chloride sizing agent, and drying to form a water-based polyvinyl chloride layer, so as to obtain the lithium ion battery separator. The shape of the separator is maintained by using the solid effect of the ceramic layer, and the separator is of high heat resistance, and the bonding property of the lithium ion battery separator is improved by using the water-based polyvinyl chloride layer.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery diaphragm and a preparation method thereof. Background technique [0002] With the increasing awareness of environmental protection and the increasing pressure of the living environment, the status of green and clean energy in the field of power energy is gradually improving. As an important direction in the field of energy conversion and energy storage, lithium-ion batteries occupy an important position. Lithium-ion batteries have the characteristics of high energy density, high working voltage, long cycle life, low self-discharge rate, and environmental protection, so they are widely used in electronic products, electric vehicles and other fields. [0003] In lithium-ion batteries, the separator is mainly to separate the positive and negative electrodes to prevent short circuit and allow the transfer of ions. As an important component in lith...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411H01M50/431H01M50/449Y02E60/10
Inventor 程跃李旭东邓洪贵冯超
Owner ZHUHAI ENERGY NEW MATERIALS TECH CO LTD
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