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A high-strength three-layer co-extruded lithium-ion battery separator and preparation method thereof

A lithium-ion battery, three-layer co-extrusion technology, applied in the direction of secondary batteries, battery components, circuits, etc., to achieve the effect of improving the strength of the diaphragm, enhancing safety, and improving processing performance

Active Publication Date: 2022-06-28
NINGBO CHANGYANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the difference in the melt index between the polypropylene materials of each layer when the dry-process diaphragm is prepared by three-layer co-extrusion in the prior art, so as to ensure the processing performance of the diaphragm, but this is not conducive to the pore size of the diaphragm. To improve the distribution and mechanical properties, a high-strength three-layer co-extruded lithium-ion battery separator and its preparation method are provided. Two different polypropylenes with a large difference in melt index are used to make A / The diaphragm with B / A structure, by adding lubricating nucleation particles in the middle layer, can effectively improve the mechanical properties of the diaphragm while ensuring the processing performance of the diaphragm

Method used

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  • A high-strength three-layer co-extruded lithium-ion battery separator and preparation method thereof

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preparation example Construction

[0033] In parts by weight, the components of the B layer include 90-99 parts of homopolypropylene and 1-10 parts of lubricating nucleating particles, and the melt index of the homopolypropylene at 230° C. is 1-5 g / 10min , the isotacticity is not less than 98%; the preparation method of the lubricating nucleating particles includes the following steps: A) mixing polytetrafluoroethylene micropowder and pimelic acid for ball milling; the ball milling medium is ethanol, and the ball milling time is 1~3h B) add calcium stearate, continue ball milling for 0.5~1h; after the ball milling finishes, the obtained product is washed and dried to obtain the lubricating nucleating particles; wherein, the added polytetrafluoroethylene micropowder, pimelic acid and stearic acid The mass ratio of calcium is 5~10:1:1~2; the ball milling temperature in steps A) and B) is -20~-10°C, the mass ratio of the material balls added during ball milling is 1:10~30, and the polytetrafluoroethylene The mass-vo...

Embodiment 1

[0043] A high-strength three-layer co-extruded lithium ion battery separator, comprising a B layer and an A layer arranged on both sides of the B layer; the total thickness of the separator is 16 μm, wherein the thickness of the B layer is 14 μm, and the thickness of the A layer is 1 μm;

[0044] The component of layer A is copolymerized polypropylene (Daihan Oil & Gas CB5230, its melt index at 230°C is 30g / 10min, and its rigidity modulus is 18000 kgf / cm 2 , the heat distortion temperature is 135 °C); in parts by weight, the components of the B layer include 90 parts of homopolypropylene (Korean Oil Chemical S801, its melt index at 230 °C is 3.0 g / 10min, isotactic 98%) and 5 parts of lubricating nucleating particles;

[0045] Wherein, the preparation method of lubricating nucleating particles includes the following steps: A) Mixing polytetrafluoroethylene micropowder (DuPont MP1300, USA) and pimelic acid in a high-energy ball mill for ball milling; the ball milling medium is e...

Embodiment 2

[0055] The difference between Example 2 and Example 1 is: in parts by weight, the components of layer A include 99 parts of copolymerized polypropylene (Korean Oil Chemical CB5230) and 1 part of calcium sulfate whisker (Weduofeng Biotechnology), and the rest are The same as in Example 1.

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Abstract

The invention relates to the technical field of lithium-ion battery separators, and discloses a high-strength three-layer co-extruded lithium-ion battery separator and a preparation method thereof. The separator includes a B layer and A layers arranged on both sides of the B layer; the composition of the A layer The components of the B layer include 90-99 parts of homopolypropylene and 1-10 parts of The lubricating nucleating particles, the melt index of the homopolypropylene at 230°C is 1~5g / 10min; the lubricating nucleating particles are composed of polytetrafluoroethylene micropowder, pimelic acid and calcium stearate Made by ball milling. In the present invention, two different polypropylenes with large differences in melt index are used to make a diaphragm of A / B / A structure through three-layer co-extrusion, and lubricating nucleating particles are added to the middle layer to ensure the processing performance of the diaphragm. , effectively improving the mechanical properties of the diaphragm.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery separators, in particular to a high-strength three-layer co-extruded lithium ion battery separator and a preparation method thereof. Background technique [0002] As the main component of liquid lithium-ion batteries, battery separators play a vital role in batteries. The separator material is between the positive and negative electrodes of the lithium battery, a layer of insulating film containing a large number of microporous structures, and the main body is composed of insulating polymer materials. The diaphragm has two main functions: one is to isolate the positive and negative electrodes in the battery to prevent direct contact between the two poles and short-circuit, and at the same time, under the premise of ensuring safety, it needs to be as thin as possible to reduce the distance between the two poles and reduce the internal resistance of the battery; the second is to be able ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/414H01M50/457H01M50/403H01M50/489H01M50/491H01M50/494H01M10/0525
CPCH01M50/414H01M50/457H01M50/403H01M50/489H01M50/491H01M50/494H01M10/0525
Inventor 王绪田慧婷范建国李健权杨雄
Owner NINGBO CHANGYANG TECH
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