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

Separator preparation method for lithium ion battery with high safety and high energy density

A high-energy density, lithium-ion battery technology, applied in battery pack components, separators/films/diaphragms/spacers, circuits, etc. Large-scale equipment is required to achieve the effect of good wettability, low equipment requirements, and uniform pore size distribution.

Active Publication Date: 2019-02-01
SUN YAT SEN UNIV
View PDF14 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ding Huaiyu et al. (Preparation of polyphenylene sulfide porous membrane by thermal phase separation method, Acta Polymer Sinica 4 (2005), 551-559) studied the preparation of polyphenylene sulfide porous film by using diphenyl sulfone and benzophenone as diluents respectively. Membrane, not suitable for lithium-ion battery separator due to too large pore size
In addition, Chinese Invention Patent Publication Nos. CN103205123A and CN103178230A both provide a method for preparing polyphenylene sulfide separators for lithium-ion batteries by casting, extrusion, and stretching. The methods provided are cumbersome, require large-scale equipment, and cost too much
Chinese Invention Patent Publication No. CN104795525A provides a polyphenylene sulfide separator for lithium-ion batteries by using melt-blown polyphenylene sulfide non-woven fabric as the base cloth and performing heat setting treatment on it, but the polyphenylene sulfide separator prepared by this method The ether separator has problems such as large pores and thick thickness, which can easily cause problems such as micro-short circuit and self-discharge inside the lithium-ion battery.

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
  • Separator preparation method for lithium ion battery with high safety and high energy density
  • Separator preparation method for lithium ion battery with high safety and high energy density

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 4g polyphenylene sulfide resin, 9g diphenylsulfone and 3g polyethersulfone blended in a quartz bottle, heat to 250℃ under nitrogen protection, and mechanically agitate for 20min to obtain polyphenylene sulfide, diphenylsulfone and A blended solution of polyethersulfone (in which the mass fraction of polyphenylene sulfide is 25%, and the mass ratio of the first diluent diphenylsulfone and the second diluent polyethersulfone is 3:1). Then pour the blended liquid into an ice-water bath to obtain the three blended solids, which are crushed into powder particles with a pulverizer. Weigh 0.75g of the powder sample, place it in a 40μm thick polyimide mold (area: 7cm×8cm), use a plate vulcanizer to press at 4MPa and 250°C for 3min to obtain polyphenylene sulfide and diphenylsulfone Blend film with polyethersulfone. Finally, dimethyl sulfoxide was used to extract diphenyl sulfone and polyether sulfone as the diluent for 12 hours, and the extractant was evaporated and dried...

Embodiment 2

[0032] Weigh 4g of polyphenylene sulfide resin, 10g of diphenylsulfone and 2g of polyethersulfone to blend, in which the mass fraction of polyphenylene sulfide is 25%, and the mass ratio of the first diphenyl sulfone and the second diluent polyether sulfone The ratio is 5:1, and the other experimental steps are the same as in Example 1, and the polyphenylene sulfide porous membrane (diaphragm A2) is prepared.

Embodiment 3

[0034] Weigh 3g of polyphenylene sulfide resin, 8g of diphenylsulfone and 1g of polyethersulfone to blend, in which the mass fraction of polyphenylene sulfide is 25%, and the mass ratio of the first diphenyl sulfone and the second diluent polyether sulfone The ratio is 8:1, and the other experimental procedures are the same as in Example 1, and the polyphenylene sulfide porous membrane (diaphragm A3) is prepared.

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 sizeaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the field of lithium ion battery separators, and relates to a separator preparation method for a lithium ion battery with high safety and high energy density. The separator consists of special engineering plastics polyphenylene sulfide. The invention discloses the preparation method of the separator. The method adopts a thermally induced phase separation method of a double-component diluent, and includes melt blending the double-component diluent and the polyphenylene sulfide; quenching and pulverizing the mixture into powder; then pressing the powder into a separatorby a flat vulcanizer; and finally dring the separator after removing the diluent by using an extracting agent to obtain the polyphenylene sulfide separator. The preparation method for the separator issimple in process, low in production cost and easy for large-scale production. The polyphenylene sulfide separator has the characteristics of large porosity, high temperature resistance, high mechanical strength, good electrolyte wettability and the like, and is of great significance for developing the lithium ion battery with high safety and high energy density.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion battery diaphragms, and specifically relates to a method for preparing a lithium ion battery diaphragm with high safety and high energy density. Background technique [0002] With the energy crisis and the global greenhouse effect becoming increasingly serious today, the development of clean and green sustainable energy storage and conversion devices is extremely urgent. Among them, lithium-ion batteries are widely used in portable electronic equipment and high-power power devices because of their high energy density, long cycle life, environmental friendliness, and no memory effect. At the same time, as the application of lithium-ion batteries in electric vehicles, hybrid vehicles, energy storage and other fields continues to deepen, the requirements for safety performance and energy density of lithium-ion batteries are getting higher and higher. Lithium-ion batteries are mainly composed of posit...

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): H01M2/14H01M2/16H01M50/403H01M50/411H01M50/414H01M50/497
CPCH01M50/40H01M50/409H01M50/403Y02E60/10
Inventor 肖敏刘俊辰孟跃中王拴紧韩东梅莫玉迪
Owner SUN YAT SEN UNIV
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