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Dry lithium battery separator and preparation method thereof

A lithium battery diaphragm and dry process technology, which is applied to battery pack parts, circuits, electrical components, etc., can solve the problems of poor thermal stability of lithium battery diaphragms, and achieve good penetration, high pore size consistency, and high porosity. Effect

Active Publication Date: 2019-05-10
JIESHOU CITY TIANHONG PACKAGING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the contrary, since the polyethylene base material is used in the wet production process, the melting point of the polyethylene base material is only 140 ° C. Therefore, compared with the lithium battery separator produced by the dry production process, the lithium battery separator produced by the wet production process has a higher poor thermal stability

Method used

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  • Dry lithium battery separator and preparation method thereof

Examples

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Effect test

Embodiment 1

[0046] A dry-process lithium battery separator, the lithium battery separator includes a core layer and surface layers arranged on both sides of the core layer, the core layer includes polyethylene 95%, polybutylene terephthalate 4% , 1% of zinc salt of unsubstituted phenylphosphonic acid, said percentage content is percentage by weight;

[0047] The surface layer includes 94.5% of polypropylene, 4.5% of polybutylene terephthalate, and 1% of zinc salt of unsubstituted phenylphosphonic acid, and the percentage is by weight;

[0048] The particle size of the zinc salt of unsubstituted phenylphosphonic acid is 0.5 μm;

[0049] The melt flow rate of the polyethylene is 1.5-2.0 g / 10 min.

[0050] The polypropylene is isotactic polypropylene, and its melt flow rate is 2.5-3.5g / 10min.

[0051] The preparation method of the above-mentioned dry-process lithium battery separator includes: weighing the raw materials used for the core layer and the surface layer according to the formula...

Embodiment 2

[0054] The dry-process lithium battery separator provided in Example 1, the difference is that the zinc salt of unsubstituted phenylphosphonate is replaced with iron salt of unsubstituted phenylphosphonate;

[0055] With the rest unchanged, the lithium battery separator was prepared according to the method in Example 1.

Embodiment 3

[0057] The dry-process lithium battery separator provided in Example 1, the difference is that the zinc salt of unsubstituted phenylphosphonic acid is replaced with sodium salt of unsubstituted phenylphosphonic acid;

[0058] With the rest unchanged, the lithium battery separator was prepared according to the method in Example 1.

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Abstract

The invention belongs to the technical field of lithium battery separators, and particularly relates to a dry lithium battery separator and a reparation method thereof. The lithium battery separator comprises a core layer and surface layers disposed on both sides of the core layer, wherein the core layer comprises 93.8-97% of polyethylene, 2.5-5% of polybutylene terephthalate, and 0.5-1.2% of phenylphosphonic acid metal salt, and the percentage composition is the percentage by weight; the surface layers comprise 91.5-96.2% of polypropylene, 3-7% of polybutylene terephthalate, and 0.8-1.5% of phenylphosphonic acid metal salt, and the percentage composition is the percentage by weight. The dry lithium battery separator provided by the invention, by introducing incompatible polybutylene terephthalate into a three-layer composite structure of polypropylene / polyethylene / polypropylene, promoting the formation of micronized crystals, and forming a microporous structure with high porosity andupper and lower penetrating micropores through a biaxial stretching process, is completely different from the traditional micropore preparation technology, which avoids the high precision requirementof the process in the traditional micropore preparation technology and reduces the difficulty of preparation of micropores.

Description

technical field [0001] The invention belongs to the technical field of lithium battery diaphragms, and in particular relates to a dry-process lithium battery diaphragm and a preparation method thereof. Background technique [0002] The lithium battery diaphragm is one of the key inner components of the lithium battery. Its main function is to separate the positive and negative electrodes of the lithium battery to prevent the two poles from contacting and short-circuiting; although the material of the lithium battery diaphragm is non-conductive, it has The function of allowing electrolyte ions to pass through; the performance of the separator determines the interface structure and internal resistance of the lithium battery, which directly affects the capacity, cycle and safety performance of the lithium battery. Under overcharge / overdischarge or other extreme conditions, the internal temperature of the lithium battery will rise rapidly. When the internal temperature of the li...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/417H01M50/457
CPCY02E60/10
Inventor 吴磊胡伟张德顺李汪洋何祥燕徐凤锦孙小华郭浩贺云杨建军
Owner JIESHOU CITY TIANHONG PACKAGING MATERIAL
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