Three-layer lithium battery diaphragm and preparation method thereof

A lithium battery separator and separator technology, which is applied in battery pack components, chemical instruments and methods, circuits, etc. Reduced pore temperature, good high temperature stability, stable porosity and air permeability
CN104022249AActive Publication Date: 2014-09-03FOSHAN YINGBOLAI TECH
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
FOSHAN YINGBOLAI TECH
Publication Date
2014-09-03

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Abstract

The invention discloses a three-layer lithium battery diaphragm and a preparation method thereof. The diaphragm is prepared by adopting a three-layer coextrusion technology, and comprises an outer layer, a middle layer and an inner layer, wherein the outer layer is prepared from 92-93% of polypropylene A, 5-6% of polypropylene B and 1-3% of a reinforcing agent which are taken as raw materials; the middle layer is prepared from 83-86% of polypropylene A, 13-14% of polypropylene B and 1-4% of an additive which are taken as raw materials; the inner layer is prepared from 93-95% of polypropylene A, 3-4% of polypropylene C and 1-4% of a reinforcing agent which are taken as raw materials. The preparation method comprises the following steps of a) mixing and absorbing materials; b) extruding and stretching; c) baking; and d) stretching. The middle layer of the three-layer lithium battery diaphragm provided by the invention is a polypropylene layer, and the three-layer lithium battery diaphragm is prepared from the polypropylene layers of the outer layer and the inner layer in a three-layer coextrusion mode. The obturator temperature decreases greatly and reaches 138 DEG C minimally.
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Description

technical field

[0001] The invention relates to a polymer material plastic film, in particular to a three-layer lithium battery diaphragm and a preparation method thereof. Background technique

[0002] The lithium battery separator is one of the key inner components in the lithium battery structure. Its main function is to separate the positive and negative electrodes of the lithium battery to prevent the two electrodes from contacting and short circuit. In addition, it also has the function of allowing electrolyte ions to pass through. The performance of the lithium battery separator determines the interface structure and internal resistance of the lithium battery, which directly affects the capacity, cycle and safety performance of the battery. A lithium battery separator with excellent performance plays an important role in improving the overall performance of the lithium battery. Lithium battery materials are non-conductive, and their physical and chemical properties hav...

Claims

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