Continuous polyethylene dissolving process in a double screw extructor to prepare lithium ion cell diaphragm

A technology of twin-screw extruder and lithium-ion battery, which is applied in the direction of secondary battery parts, etc., can solve the problems of uneven micropores and uneven dissolution of the diaphragm, and achieve the effect of uniform hole shape, good strength and simple operation

Inactive Publication Date: 2007-08-22
HARBIN COSLIGHT POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of uneven micropores of the separator caused by uneven dissolution

Method used

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  • Continuous polyethylene dissolving process in a double screw extructor to prepare lithium ion cell diaphragm

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specific Embodiment approach 1

[0007] Specific Embodiment 1: The steps of the method for preparing lithium-ion battery separators in this embodiment are as follows: 1. Add ultra-high molecular weight polyethylene, high-density polyethylene and mineral oil together in the continuous batching and feeding kettle 1, at 10 to 60 rpm Mix the raw materials evenly, wherein the mass ratio of ultra-high molecular weight polyethylene and high-density polyethylene is 1:1-15, and the mass ratio of the total mass of ultra-high molecular weight polyethylene and high-density polyethylene to mineral oil 1:5-15; 2. The mixture is continuously added to the twin-screw extruder 2; under the condition of 40-240°C, the ultra-high molecular weight polyethylene and high-density polyethylene are continuously dissolved in the twin-screw extruder 2 Mineral oil, then continuously extruded by twin-screw extruder 2 at a speed of 50 to 250 rpm; 3. The mixture is 1 according to the mass ratio of the total mass of ultra-high molecular weight...

specific Embodiment approach 2

[0010] Specific embodiment 2: In this embodiment, in step 1, the molecular weight of the ultra-high molecular weight polyethylene is 1 million to 8 million. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0011] Specific embodiment three: In this embodiment, in step one, the molecular weight of the ultra-high molecular weight polyethylene is 4.5 million. Others are the same as in the first embodiment.

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Abstract

The present invention is continuous polyethylene dissolving process in a double screw extruder to prepare diaphragm for lithium ion cell. The preparation process includes dissolving super high molecular weight polyethylene and high density polyethylene in mineral oil, extruding out through a slot to form belt, mineral oil extraction, biaxial tension, mineral oil extraction for the second time and settling to form the diaphragm. The diaphragm has the features of homogeneous pores, high porosity and high strength, and the process is simple and low in cost.

Description

technical field [0001] The invention relates to a method for preparing a lithium-ion battery diaphragm. Background technique [0002] As the demand for miniaturized radio equipment such as notebooks, cellular phones, and video cameras increases, the demand for lithium-ion secondary batteries is also increasing because of their high operating voltage and high energy density. Therefore, the preparation of raw materials for lithium-ion secondary batteries is becoming more and more important, and the preparation of diaphragms is an indispensable one. In the past, the preparation process of the separator did not dissolve uniformly. That is, the dissolution between the two polyethylene materials and mineral oil is not uniform. Due to the inhomogeneous dissolution, it can be clearly observed through the scanning electron microscope that the ultra-high molecular weight polyethylene and conventional molecular weight polyethylene are unevenly distributed in the formed lithium-ion ba...

Claims

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Application Information

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IPC IPC(8): C08J5/22C08J3/09C08L23/06B29C69/02H01M10/02
CPCY02E60/10
Inventor 宋殿权朱林
Owner HARBIN COSLIGHT POWER CO LTD
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