A kind of polyethylene microporous film, preparation method and lithium ion battery

A polyethylene microporous film, lithium ion battery technology, applied in battery pack parts, circuits, electrical components, etc. Enhanced puncture resistance, good self-discharge performance, and the effect of preventing short circuits
CN104362276BActive Publication Date: 2018-04-17乐凯胶片股份有限公司 +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
乐凯胶片股份有限公司
Publication Date
2018-04-17

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Abstract

The invention provides a polyethylene microporous membrane, a preparation method and a lithium ion battery. The microporous membrane is composed of a front and a back: the average pore size of the front is 100-200 nm; the average pore size of the back is 50-100 nm, and The ratio of average pore size on both sides is A:B=1.1~4.0:1, and the pore size distribution is less than 30%. When the microporous membrane prepared by the invention is used in a lithium ion battery, the front side is close to the positive pole of the battery, and the back side is close to the negative pole of the battery, and not only has good high-rate discharge performance, but also has good self-discharge performance.
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Description

technical field

[0001] The invention relates to the technical field of lithium ion batteries, in particular to a polyethylene microporous membrane, a preparation method and a lithium ion battery using the microporous membrane. Background technique

[0002] Polyolefin microporous membrane is a porous membrane with microporous structure on both sides. When used as a lithium-ion battery separator, the existence of the separator must first satisfy that it cannot deteriorate the electrochemical performance of the battery. Its suitable submicron pore size is one of the important indicators to meet the requirements of battery charge and discharge performance, safety performance, cycle performance and other aspects.

[0003] For any battery application, the separator should have a uniform pore size distribution to avoid inconsistent current densities that would degrade battery performance. The submicron sized pore size is critical to prevent short circuits between positive and neg...

Claims

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