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Lithium ion battery diaphragm and its production method

A technology for lithium-ion batteries and production methods, which is applied to battery pack parts, circuits, electrical components, etc., can solve the problems of narrow and long hole shape, complicated preparation process, and low transverse strength, and achieve uniform hole shape and high air permeability , the effect of high porosity

Inactive Publication Date: 2004-07-21
XINXIANG ZHONGKE SCI&TECH
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

However, the disadvantage of this diaphragm is that the transverse strength is extremely low, the hole shape is long and narrow, and the preparation process is complicated, which limits its use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0007] The present invention has the following embodiments. Under the full control of the computer, the crystallization nucleating agent amide compound (chemical structural formula is R-(c=o)-R'-( c=0)-R) is evenly added into the polyolefin resin and melted and extruded by an extruder, and then cooled and rolled into an original flat film with high crystal content, which is sequentially put into a fully automatic vertical and horizontal biaxial stretching machine for continuous stretching Stretched, then heat-set into a lithium-ion battery separator. The polyolefin melt index in the above process should be within 0.5-10. The temperature of melt extrusion is selected between 130-280° C., and the rolling temperature of the original flat film in the cooling roller is 40-110° C. Usually the K value content of the crystalline form is above 0.5, preferably above 0.8. Usually the relationship between crystallization nucleating agent and crystalline form K value is shown in the foll...

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PUM

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Abstract

Characters of the invention are that crystal-nucleating agent of amide family compound is added into polyolefine resin. The procedure of the method includes following steps. (1) Under computer full control, hoisting system adds polyolefine resin containing 0.001-3% crystal-nucleating agent to extruder. In temperature 130-280 deg.C, the material is melted and extruded out. Then, primal flat film is rolled and obtained by using cooling roller to treat the material at temperature 40-110 deg.C. (2) The said primal flat film is fed into vertical and horizontal biaxial stretcher for stretch formability. Finally, heat customization is carried out. The selected crystal-nucleating agent possesses high crystal transformation ratio, and abundant source. Battery diaphragm provides features of high porosity, shapely hole shape, good intensity in both directions, and low cost. The invention can be applied to lithium cell, secondary cell or other type batteries after hydrophilic treatment.

Description

Technical field: [0001] The invention relates to a novel lithium-ion battery diaphragm and a production method thereof. Background technique: [0002] Battery separator is an indispensable material in battery production. It is often made of microporous separator with good insulation performance and good gas permeability. The material used to make the diaphragm is generally polyolefin, because of its high insulation, wide temperature range, and strong hydrophobicity, it is an ideal diaphragm material for the production of lithium batteries. However, the preparation of polyolefin microporous membranes is relatively difficult. The stretching method is an economical and practical method. Because the production process does not involve solvents and is easy to industrialize, and the obtained microporous membranes have excellent mechanical properties, they are favored by people. At present, there are two methods for preparing polyolefin microporous membranes by stretching: one is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22C08J9/00H01M2/16
CPCY02E60/12Y02E60/10
Inventor 徐亮王向东杨书廷
Owner XINXIANG ZHONGKE SCI&TECH
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