Lithium-ion battery diaphragm and preparation method thereof

A lithium-ion battery and diaphragm technology, which is applied to battery components, circuits, electrical components, etc., can solve problems such as no shutdown function, unfavorable usability, and impact on battery performance
CN105140451AInactive Publication Date: 2015-12-09郑少华
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
郑少华
Publication Date
2015-12-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a lithium-ion battery diaphragm. The lithium-ion battery diaphragm is prepared by coating the upper surface and the lower surface of a porous base material with one or more porous coatings, wherein the thickness of the porous base material is 4-80 microns; the porosity of the porous base material is 30%-90%; and each porous coating comprises the following raw materials in parts by weight: 30-100 parts of a polymer material, 0-70 parts of inorganic powder and a surface treating agent and 0-50 parts of a compatibilizer. The invention further discloses a preparation method of the lithium-ion battery diaphragm. The battery diaphragm disclosed by the invention is controllable in pore size and porosity and uniform in pore size; the finished diaphragm product is high in high-grade rate, good in wettability and high in safety; and the diaphragm is good in heat resistance, and has a thermal closing function.
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Description

technical field

[0001] The invention relates to a battery diaphragm, in particular to a lithium ion battery diaphragm and a preparation method thereof. Background technique

[0002] The green and pollution-free secondary battery lithium-ion battery is in line with the development direction of energy and environmental protection in various countries today, and its usage in all walks of life is increasing rapidly. As an important part of lithium-ion batteries, the separator plays the role of separating the positive and negative electrodes of the battery cell, and its performance directly affects the overall performance of the battery.

[0003] The lithium-ion battery separator is used to isolate the positive and negative electrodes in the battery, allowing free ions to pass between them, preventing the two electrodes from contacting and short-circuiting, and protecting the battery. Therefore, in addition to requiring a certain porosity and pore size distribution for the batte...

Claims

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