Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Diaphragm with uniform pore diameter and preparation method of diaphragm

A diaphragm and uniform technology, applied in the field of electrochemistry, can solve the problems of large distribution intervals and battery difficulties, and achieve the effects of uniform stretching, uniform pore size distribution, and good pore size consistency

Inactive Publication Date: 2020-11-13
JIANGSU HORIZON NEW ENERGY TECH CO LTD
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the pore size of PE wet-process separators in the industry is mainly distributed between 30-55nm, and the distribution range is relatively large, which brings great difficulties to the battery pack.

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
  • Diaphragm with uniform pore diameter and preparation method of diaphragm
  • Diaphragm with uniform pore diameter and preparation method of diaphragm
  • Diaphragm with uniform pore diameter and preparation method of diaphragm

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0032] A method for preparing a membrane with uniform pore size, comprising the following steps:

[0033] Step S1, preparing a mixed solution composed of a polyolefin composition and white oil; the polyolefin composition accounts for 10% to 35% by mass of the mixed solution, and the mass average molecular weight of the polyolefin composition is more than 90,000; The white oil used is high-molecular-weight white oil, and the molecular weight of the white oil is between 2000-4000; if high-molecular-weight white oil is used, after the polyolefin and white oil are dissolved and mixed, phase separation is not easy to occur, so that the diaphragm is stretched It is more uniform during the extraction process, and the white oil is washed out in the subsequent extraction process to form a relatively uniform porous structure in the polyolefin. The pore size of the separator is consistent and the pore size distribution is more uniform. The molecular weight of white oil is preferably 2500...

Embodiment 1

[0041] Step S1, preparing a mixed solution composed of polyolefin composition and white oil; in this embodiment 1, the polyolefin composition accounts for 10% by mass of the mixed solution, the mass percent of white oil is 90%, and the polyolefin composition Select high-molecular-weight polyethylene with a mass-average molecular weight of 520,000 for use, and the concentration of polyethylene is 10%. The white oil used is high-molecular-weight white oil, and the molecular weight of the white oil is between 2000-4000. In the present embodiment 1, use The molecular weight of the white oil is 3000, and the mass percentage of the non-volatile solvent in the high molecular weight white oil is 85%.

[0042] Step S2, melting and kneading the above-mentioned mixed solution, extruding the obtained molten and kneaded product from the mold, cooling and solidifying to obtain a gel-like molded product; in step S2, when the molten and kneaded product is extruded from the mold The temperatur...

Embodiment 2

[0060] Step S1, preparing a mixed solution composed of a polyolefin composition and white oil; in Example 2, the polyolefin composition accounts for 20% by mass of the mixed solution, the mass percent of white oil is 80%, and the polyolefin composition Select high-molecular-weight polypropylene with a mass-average molecular weight of 520,000, and the concentration of polypropylene is 20%. The white oil used is high-molecular-weight white oil, and the molecular weight of the white oil is between 2000-4000. In this embodiment 2, use The molecular weight of the white oil is 2000, and the mass percentage of the non-volatile solvent in the white oil is 80%.

[0061] Step S2, melting and kneading the above-mentioned mixed solution, extruding the obtained molten and kneaded product from the mold, cooling and solidifying to obtain a gel-like molded product; in step S2, when the molten and kneaded product is extruded from the mold The temperature range is the melting point T~T+65°C of ...

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
pore size distributionaaaaaaaaaa
thicknessaaaaaaaaaa
Gurley valueaaaaaaaaaa
Login to View More

Abstract

The invention discloses a diaphragm with uniform pore diameter and a preparation method of the diaphragm. The pore diameter of the diaphragm ranges from 40nm to 50nm, the porosity ranges from 20% to 90%, and the diaphragm thickness ranges from 2mu m to 27mu m. According to the invention, high-molecular-weight white oil is used as a solvent; the molecular weight of conventional white oil is generally about 400, and when the white oil is used as a processing aid and the molecular weight of the white oil is relatively large, phase separation is not liable to occur after polyolefin and the white oil are dissolved and mixed, so that the diaphragm is more uniform during stretching, and through subsequent extraction, the diaphragm can be more consistent in pore diameter and more uniform in pore size distribution.

Description

technical field [0001] The invention relates to a diaphragm with uniform pore size and a preparation method thereof, belonging to the technical field of electrochemistry. Background technique [0002] With the accelerated development of electric vehicles, new energy vehicles have increasingly stringent requirements for battery power packs, and the PACK of power batteries requires a high degree of battery consistency, so as to better manage the battery; and the consistency of the battery A very important part of the reliability depends on the consistency of the separator. As an important indicator of the separator, the pore size distribution of the separator is very important to the consistency of the separator. If the pore size distribution is narrow, the consistency of the diaphragm holes will be high. The positive and negative electrodes inside the battery If the pore size distribution is wide, the consistency of the diaphragm pores will be poor, and the interface between ...

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): H01M2/16H01M2/14H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 王成豪李正林翁星星陈朝晖贡晶晶
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com