Composite membrane for lithium sulphur battery and preparation method thereof

A lithium-sulfur battery and composite membrane technology, which is applied to battery components, circuits, electrical components, etc., can solve the problems of increasing the battery shuttle effect, improve Coulombic efficiency and cycle life, inhibit the formation of dendrites, Effect of High Coulombic Efficiency and Cycle Life

Active Publication Date: 2014-06-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
View PDF3 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zhan Lin et al. (Adv.Funct.Mater.2012.DOI:10.1002 / adfm.201200696) proposed that adding phosphorus pentasulfide to the electrolyte can not only form a protective film on the surface of the negative electrode of the lithium sheet, but also dissolve the irreversibly deposited lithium sulfide , the battery stability has been improved to a certain extent, but the dissolution of polysulfide by phosphorus pentasulfide may also increase the "flying shuttle" effect of the 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
  • Composite membrane for lithium sulphur battery and preparation method thereof
  • Composite membrane for lithium sulphur battery and preparation method thereof
  • Composite membrane for lithium sulphur battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A commercial polypropylene separator (Celgard 2500) was plasma-modified. The modification conditions are under an oxygen atmosphere, the gas flow rate is 60 sccm, the processing power is 100 W, and the processing time is 1 minute and then taken out. Place the diaphragm in 0.5molL -1 After soaking in the ethanol solution of lithium silane imide (the structural formula is shown in formula 1) for 24 hours, take it out. After repeated rinsing with water and ethanol, place in vacuum-dried at 60°C for 48 hours to remove water and set aside. The modified diaphragm was tested according to the method of Comparative Example 1. The experimental results are shown in Table 1.

Embodiment 2

[0055]A commercial polypropylene separator (Celgard 2500) was plasma-modified. The modification conditions are under an oxygen atmosphere, the gas flow rate is 70 sccm, the processing power is 200W, and the processing time is 2 minutes before taking out. Place the diaphragm in 0.7molL -1 The lithium silaneimide (structural formula shown in formula 2) was soaked in methanol solution for 24 hours, and then taken out. After repeated washing with water and methanol, vacuum-dry at 60°C for 48 hours to remove water and set aside. The modified diaphragm was tested according to the method of Comparative Example 1. The experimental results are shown in Table 1.

Embodiment 3

[0057] A commercial polypropylene separator (Celgard 2500) was plasma-modified. The modification conditions are under an argon atmosphere, the gas flow rate is 80 sccm, the processing power is 300 W, and the processing time is 10 minutes before taking out. Place the diaphragm in 1molL -1 Lithium silaneimide (structure formula shown in formula 3) was soaked in toluene solution for 18 hours, and then taken out. After repeated washing with water and isopropanol, vacuum-dry at 60°C for 48 hours to remove water and set aside. The modified diaphragm was tested according to the method of Comparative Example 1. The experimental results are shown in Table 1.

[0058] Table 1

[0059]

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
porosityaaaaaaaaaa
Login to view more

Abstract

The invention relates to a composite membrane for a lithium sulphur battery and a preparation method thereof. The composite membrane is prepared from a polypropylene diaphragm, a polyethylene diaphragm, or a polypropylene-polyethylene composite diaphragm and silane lithium imide through hydrolytic polycondensation, the silane lithium imide accounts for 0.1-10wt% of the composite membrane. The composite membrane has better liquid protecting performance, prevents circuit break of the battery in use due to the dry diaphragm, can inhibit generation of cathode lithium dendritic crystals, and has better conductivity; and the preparation method is simple and feasible, the raw materials are easy to obtain, the preparation process for modified membranes is simple and practical and is beneficial to industrial production.

Description

technical field [0001] The invention relates to a modified separator, in particular to a modified separator for lithium-sulfur batteries. In particular, a modified separator capable of improving the coulombic efficiency and cycle life of a lithium-sulfur battery and a preparation method thereof. Background technique [0002] Recently, lithium-sulfur batteries have received increasing attention as an advanced lithium-ion battery. This is a lithium-sulfur battery with a very high specific energy density (1672mAh.g -1 ), and the sulfur cathode is cheap and environmentally friendly. [0003] However, polysulfides have high solubility in common electrolytes, and the dissolved polysulfides will repeatedly diffuse and shuttle between the positive and negative electrodes, that is, the "shuttle" phenomenon. The "flying shuttle" phenomenon will reduce the coulombic efficiency of lithium-sulfur batteries and deteriorate the cycle life. Only by effectively inhibiting the shuttling o...

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): C08J7/18C08L23/12C08L23/06H01M2/16H01M50/403H01M50/417H01M50/497
CPCY02E60/10
Inventor 张华民曲超张凤祥张益宁王美日马艺文
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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