Modified homo-polypropylene/high-density polyethylene/modified homo-polypropylene three-layer co-extrusion lithium battery diaphragm and preparation method therefor

A high-density polyethylene, homopolypropylene technology, applied in the direction of separator/film/diaphragm/spacer element, secondary battery, battery pack components, etc., can solve problems such as affecting the stability of the diaphragm, and achieve good strength , Improve the integrity and battery safety, the effect of good surface plasticization uniformity

Active Publication Date: 2017-11-03
襄阳惠强新能源材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above patents, the addition of heterogeneous materials in the surface layer or the middle layer will affect the stability of the diaphragm during use

Method used

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  • Modified homo-polypropylene/high-density polyethylene/modified homo-polypropylene three-layer co-extrusion lithium battery diaphragm and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A modified homopolypropylene / high-density polyethylene / modified homopolypropylene three-layer co-extruded lithium battery diaphragm, which is A 1 / B / A 2 Three-layer structure with a total thickness of 12 μm; surface layer A 1 、A 2 Both are porous structures formed by modified homopolypropylene, which is homopolypropylene (PPH) doped with high-density polyethylene (HDPE), and the weight ratio of PPH / HDPE in modified homopolypropylene =30:1; the middle layer B is a porous structure formed by high-density polyethylene (HDPE); and the surface layer A 1 、A 2 The thicknesses are all 3 μm, and the thickness of the middle layer B is 6 μm.

[0032] The preparation method of the above-mentioned modified homopolypropylene / high-density polyethylene / modified homopolypropylene three-layer co-extruded lithium battery diaphragm, the specific steps are as follows:

[0033] 1) Preparation of surface material modified homopolypropylene: Homopolypropylene (PPH, Daehan Petrochemical, S...

Embodiment 2

[0042] A modified homopolypropylene / high-density polyethylene / modified homopolypropylene three-layer co-extruded lithium battery diaphragm, which is A 1 / B / A 2 Three-layer structure with a total thickness of 35 μm; surface layer A 1 、A 2 Both are porous structures formed by modified homopolypropylene, which is homopolypropylene (PPH) doped with high-density polyethylene (HDPE), and the weight ratio of PPH / HDPE in modified homopolypropylene =45:1; the middle layer B is a porous structure formed by high-density polyethylene (HDPE); and the surface layer A 1 、A 2 The thicknesses are all 10 μm, and the thickness of the middle layer B is 15 μm.

[0043] The preparation method of the above-mentioned modified homopolypropylene / high-density polyethylene / modified homopolypropylene three-layer co-extruded lithium battery diaphragm, the specific steps are as follows:

[0044] 1) Preparation of surface material modified homopolypropylene: Homopolypropylene (PPH, Yanshan Petrochemical...

Embodiment 3

[0053] A modified homopolypropylene / high-density polyethylene / modified homopolypropylene three-layer co-extruded lithium battery diaphragm, which is A 1 / B / A 2 Three-layer structure with a total thickness of 9 μm; surface layer A 1 、A 2 Both are porous structures formed by modified homopolypropylene, which is homopolypropylene (PPH) doped with high-density polyethylene (HDPE), and the weight ratio of PPH / HDPE in modified homopolypropylene =90:1; the middle layer B is a porous structure formed by high-density polyethylene (HDPE); and the surface layer A 1 、A 2 The thicknesses are all 2 μm, and the thickness of the middle layer B is 5 μm.

[0054] The preparation method of the above-mentioned modified homopolypropylene / high-density polyethylene / modified homopolypropylene three-layer co-extruded lithium battery diaphragm, the specific steps are as follows:

[0055] 1) Preparation of surface material modified homopolypropylene: Homopolypropylene (PPH, Yanshan Petrochemical, F...

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Abstract

The invention relates to a homo-polypropylene / high-density polyethylene / homo-polypropylene three-layer co-extrusion lithium battery diaphragm, wherein the diaphragm adopts an A<1> / B / A<2> three-layer structure; the surface layers A<1> and A<2> are both porous structures formed by modified homo-polypropylene; the modified homo-polypropylene is homo-polypropylene doped with high-density polyethylene, wherein the doping amount of the high-density polyethylene is equal to the doping amount corresponding to a melting temperature point which is proximal to an apparent viscosity difference value when the modified homo-polypropylene and high-density polyethylene are in a melting temperature section of 190-240 DEG C; and the middle layer B is a porous structure formed by high-density polyethylene. The prepared lithium battery diaphragm has the relatively low hole-closing temperature in the middle layer and higher melting temperature on the surface layers, so that the diaphragm melt completeness and battery safety of the lithium battery in an extreme high-temperature condition can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery separators, and in particular relates to a modified homopolypropylene / high-density polyethylene / modified homopolypropylene three-layer co-extruded lithium battery separator and a preparation method thereof. Background technique [0002] The separator plays the role of separating positive and negative electrodes, isolating electron conduction and providing channels for lithium ion transfer in lithium ion batteries. It is a key material that determines the internal interface structure, internal resistance, capacity, cycle performance, and especially safety performance of lithium batteries. Under overcharge / overdischarge or other extreme conditions, the internal temperature of lithium batteries will rise extremely rapidly. When the internal temperature of the battery is close to the melting point of the pore-forming material of the separator, the pore-forming material will soften and clos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M2/18H01M10/0525H01M50/403H01M50/417H01M50/457H01M50/491
CPCH01M10/0525H01M50/403H01M50/463H01M50/411Y02E60/10
Inventor 唐浩林王红兵马兴玉
Owner 襄阳惠强新能源材料科技有限公司
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