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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

Active Publication Date: 2014-09-03
FOSHAN YINGBOLAI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although lithium battery separators have been produced in my country, the indicators have not yet reached the level of foreign countries, or even the requirements for use.
When the lithium battery separator market is developing rapidly, domestically produced separators mainly account for the single-layer polyene layer or double-layer polyene layer separators with simple manufacturing methods, but their performance cannot meet customer needs, such as: porosity rate, tensile strength, etc.

Method used

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  • Three-layer lithium battery diaphragm and preparation method thereof
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  • Three-layer lithium battery diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A three-layer lithium battery separator, prepared by a three-layer co-extrusion process, including an outer layer, a middle layer and an inner layer, the three-layer material composition formula is shown in Table 1, wherein the outer layer is made of 92% polypropylene group A 6% polypropylene B component and 2% reinforcing agent component as raw materials, the middle layer is made of 84% polyethylene A component, 14% polyethylene B component and 2% additive component It is prepared from raw materials, and the inner layer is prepared from 93% polypropylene component A, 3% polypropylene C component and 4% reinforcing agent component.

[0041] Table 1 The melt flow rate and composition ratio of each component of Example 1

[0042]

[0043] The preparation method of the three-layer lithium battery diaphragm is as follows:

[0044] a) Mixing and suction steps: According to the ratio of each component in Table 1, mix the outer layer, middle layer and inner layer through a...

Embodiment 2

[0049] A three-layer lithium battery separator, prepared by a three-layer co-extrusion process, including an outer layer, a middle layer and an inner layer, the three-layer material composition formula is shown in Table 2, wherein the outer layer is made of 93% polypropylene group A The middle layer is made of 83% polyethylene A component, 14% polyethylene B component and 3% additive component. It is prepared from raw materials, and the inner layer is prepared from 94% polypropylene component A, 3% polypropylene C component and 3% reinforcing agent component.

[0050] Table 2 The melt flow rate and composition ratio of each component of Example 2

[0051]

[0052] The preparation method of the three-layer lithium battery diaphragm is as follows:

[0053] a) Mixing and suction steps: According to the ratio of each component in Table 2, mix the outer layer, middle layer and inner layer through a high-speed mixer for half an hour to mix evenly, and then use a vacuum suction m...

Embodiment 3

[0058] A three-layer lithium battery separator, prepared by a three-layer co-extrusion process, including an outer layer, a middle layer and an inner layer, the three-layer material composition formula is shown in Table 3, wherein the outer layer is made of 93% polypropylene A group 5.5% polypropylene B component and 1.5% reinforcing agent component as raw materials, the middle layer is made of 83.3% polyethylene A component, 13.9% polyethylene B component and 2.8% additive component It is prepared from raw materials, and the inner layer is prepared from 93.8% polypropylene component A, 3.3% polypropylene C component and 2.9% reinforcing agent component.

[0059] Table 3 The melt flow rate and composition ratio of each component of Example 3

[0060]

[0061] The preparation method of the three-layer lithium battery diaphragm is as follows:

[0062] a) Mixing and suction steps: According to the ratio of each component in Table 3, mix the outer layer, middle layer and inner...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16B32B27/08B32B27/32H01M50/403H01M50/417H01M50/457
CPCB32B27/08B32B27/32H01M50/403H01M50/411Y02E60/10
Inventor 张泰发李大星
Owner FOSHAN YINGBOLAI TECH
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