Production method of high-permeability low-density lithium battery polyolefin diaphragm

A technology of polyolefin diaphragm and production method, which is applied to battery components, circuits, electrical components, etc., can solve the problems of complex process, uneconomical cost, high cost, etc., achieve uniform temperature, enhance uniformity, increase packaging corner effect

Inactive Publication Date: 2012-04-04
TONGLING JINGNENG ELECTRONICS
View PDF3 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: the process is complicated, solvents and diluents need to be added, it will cause secondary po

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Production method of high-permeability low-density lithium battery polyolefin diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] A kind of production method of polyolefin membrane of high permeability low density lithium battery of the present invention is characterized in that it comprises following production steps:

[0013] (1) To make a nucleating agent, 20~45% of N,N-dicycloethyl-2,6 naphthalene diamide; 30~60% of N,N-bicycloethyl terephthalamide, A mixture of 0.5-8% calcium salt of suberic acid and 0.5-6% titanium dioxide, 1-6% calcium carbonate and other inorganic salts mixed with 4-6% polypropylene homopolymer as a masterbatch get nucleating agent;

[0014] (2) Mix 50-80% of metallocene-catalyzed polypropylene homopolymer with 20-50% of metallocene-catalyzed polypropylene block copolymer and 1-4% of nucleating agent, Extruded in the extruder, the angle of the die head of the extruder is adjustable, the raw material is melted and plasticized at a high temperature of 170-260 degrees, and extruded from the die head, and then chilled on a chilled roller at 100-150 degrees Celsius Cool for 2...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a production method of a high-permeability low-density lithium battery polyolefin diaphragm. The production method comprises the following steps of 1, preparing a nucleating agent, 2, mixing 50 to 80% of a metallocene-catalyzed polypropylene homopolymer, 20 to 50% of a metallocene-catalyzed polypropylene block copolymer and 1 to 4% of the nucleating agent, extruding the mixture by an extruder to obtain a diaphragm, cooling the diaphragm by a chilling roller at a temperature of 100 to 150 DEG C for 2 to 15 minutes so that a mass of beta-type crystals are produced and fully grows in the diaphragm, and cooling to obtain a casted sheet, and 3, carrying out vertical stretching and horizontal stretching of the casted sheet to obtain the high-permeability low-density lithium battery polyolefin diaphragm having density less than or equal to 0.55g/cm<3> and thickness of 12 to 60 micrometers, wherein a stretching temperature is in a range of 90 to 160 DEG C; and an area stretching ratio is in a range of 8 to 40. The high-permeability low-density lithium battery polyolefin diaphragm obtained by the production method has unique performances of high non-transparency, high gas permeability, low density (high porosity), high moisture permeability and high strength. A stretching ratio of the high-permeability low-density lithium battery polyolefin diaphragm is in a range of 8 to 40. The density of the high-permeability low-density lithium battery polyolefin diaphragm is less than 0.55g/cm<3>, and preferably, is 0.30g/cm<3>.

Description

technical field [0001] The invention relates to a production method of a lithium-ion battery diaphragm. Background technique [0002] Lithium-ion batteries have become a new generation of batteries widely used due to their high voltage, high specific energy, long cycle life and no environmental pollution. The separator, as a key component in lithium-ion batteries, plays the role of isolating the positive and negative electrodes to prevent short-circuiting of the positive and negative electrodes, and provides lithium ion transport channels during the charging and discharging process of lithium batteries. The performance of the diaphragm determines the capacity, internal resistance, cycle, storage, safety and other properties of the lithium battery. It can also block the current conduction in the battery through the closed cell function when the battery is overheated. At present, the production process of polyolefin separator can be divided into two categories: dry method an...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M2/16C08L23/12C08L53/00C08K13/02C08K5/20C08K5/098C08K3/22C08K3/26
CPCY02E60/12Y02E60/10
Inventor 梁志扬王晓云程志辉毛子俊方加亮江百川
Owner TONGLING JINGNENG ELECTRONICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap