Preparation method of polyolefin microporous diaphragm for lithium ion batteries

A polyolefin microporous film, lithium-ion battery technology, applied in battery pack parts, circuits, electrical components, etc., to achieve improved tensile properties, low porosity and air permeability, and uniform bonding

Active Publication Date: 2015-06-24
CHANGZHOU UNIV
View PDF6 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The problem to be solved by the present invention is to effectively improve the hydrophilicity and thermal deformation resistance of the polyolefin microporous membrane without affecting the basic properties of the polyolefin microporous membrane

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
  • Preparation method of polyolefin microporous diaphragm for lithium ion batteries
  • Preparation method of polyolefin microporous diaphragm for lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Take 3g of α-methylstyrene, 27g of acrylic acid, 6g of azobisisobutyronitrile, and 90g of solvent N,N-dimethylformamide into a three-necked flask in sequence. After passing through nitrogen gas to deoxygenate for 20 minutes, the three-neck flask was placed in a water bath at a temperature of 65° C. for 24 hours. After the reaction, precipitate with ether and dry in vacuum at 50° C. to obtain a prepolymer (that is, a copolymer of α-methylstyrene and acrylic acid, hereinafter referred to as “PAA”).

[0048] After PAA is ground into powder, it is fully mixed with polypropylene masterbatch (F401, Sinopec Yangzi Petrochemical Co., Ltd.) (PAA copolymer accounts for 4% of the quality of polypropylene masterbatch), and passed through a twin-screw extruder at 220 ° C. Reactive extrusion granulation obtains modified polyolefin particles.

[0049] Cast the above-mentioned modified polyolefin particles after drying at 230° C., and control the draft ratio to 40, so that the thickne...

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

PropertyMeasurementUnit
thicknessaaaaaaaaaa
water contact angleaaaaaaaaaa
porosityaaaaaaaaaa
Login to view more

Abstract

The invention belongs to the field of polymer functional films and preparations thereof, and particularly relates to a lithium ion battery diaphragm and a preparation method thereof. A polyolefin material is modified through the reactive extrusion of hydrophilic prepolymer and polyolefin, and then the obtained object is subjected to tape-casting and stretching, so that a hydrophilic polyolefin microporous diaphragm for lithium ion batteries is obtained. Compared with microporous membranes prepared by using unmodified polyolefin, the hydrophilicity, thermal deformation resistance and tensile properties of the polyolefin microporous diaphragm are obviously improved, and the other properties such as porosity and air permeability of the diaphragm are changed slightly.

Description

technical field [0001] The invention belongs to the field of polymer functional film and its preparation, in particular to a lithium ion battery separator and its preparation method. Background technique [0002] The lithium-ion battery separator is a microporous membrane located between the positive and negative electrodes of the lithium-ion battery. (2) As a safe and intelligent device, when the internal temperature of the battery rises, the micropores shrink or close to cut off the circuit, and limit the current rise to play a protective role. The separator itself does not participate in the chemical reaction of the battery, but its performance has a very important impact on the use and safety performance of the battery. [0003] The polyolefin microporous membrane has low cost, controllable pore size, stable chemical stability, good mechanical strength and electrochemical stability, and has high-temperature self-closing performance, which ensures the safety performance ...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/417H01M50/491H01M50/494
CPCY02E60/10
Inventor 蒋姗马洁李夏倩俞强丁永红
Owner CHANGZHOU UNIV
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