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

Membrane material for lithium sulfur battery positive electrode

A lithium-sulfur battery and membrane material technology, applied in the field of electrochemical batteries, can solve the problems of capacity loss, corrosion of metal lithium negative electrode, reduction of battery charging and discharging coulomb efficiency, etc., and achieve the effects of reducing corrosion effect, inhibiting dissolution and superior performance.

Active Publication Date: 2014-12-03
HENAN NORMAL UNIV
View PDF6 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of charge and discharge, elemental sulfur is easily dissolved to form soluble polysulfides. The dissolution of polysulfides in the electrolyte will reduce the coulombic efficiency of battery charge and discharge, and will further diffuse to the lithium negative electrode with the electrolyte, resulting in the formation of metal lithium negative electrodes. Corrosion, resulting in irreversible capacity loss

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
  • Membrane material for lithium sulfur battery positive electrode
  • Membrane material for lithium sulfur battery positive electrode
  • Membrane material for lithium sulfur battery positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] In this embodiment, the preparation method of the membrane material for the positive electrode of the lithium-sulfur battery comprises the following steps:

[0047] (1) Membrane precursor material pretreatment: Arrange the membrane precursor material cotton in ethylene glycol solution and soak for 9 hours, wash with distilled water 3 times, place in a vacuum drying oven, and vacuum dry at 70°C for 6 hours for later use;

[0048] (2) Take the filling material acetylene black, the stabilizer nano-vanadium pentoxide and the binder A polyvinylidene fluoride solution (PVDF, 15wt%, the solvent is NMP), and the mass ratio of the filling material to the binder A is 1: 2. The quality of the stabilizer is 10% of the mass of the filling material. After the slurry is adjusted, the slurry is evenly scraped on the pretreated film precursor material in step (1). The thickness of the scraped slurry is 0.05mm, and it is placed in a vacuum In a drying oven, vacuum dry at 50°C for 24 hour...

Embodiment 2

[0055] In this embodiment, the preparation method of the membrane material for the positive electrode of the lithium-sulfur battery comprises the following steps:

[0056] (1) Membrane precursor material pretreatment: Arrange the conductive carbon fibers of the membrane precursor material in ethanol solution for 8 hours, wash with distilled water for 3 times, place in a vacuum drying oven, and vacuum dry at 100°C for 2 hours for later use;

[0057] (2) Take the filling material superconducting carbon black, the stabilizer nano zinc oxide and the binder A carboxymethyl cellulose solution (CMC, 10wt%, the solvent is distilled water), the mass ratio of the filling material to the binder A is 1 : 2. The quality of the stabilizer is 5% of the quality of the filling material. After the slurry is adjusted, the slurry is evenly scraped on the pretreated film precursor material in step (1), and the thickness of the scraped slurry is 0.10mm. In a vacuum drying oven, vacuum dry at 50°C f...

Embodiment 3

[0064] In this embodiment, the preparation method of the membrane material for the positive electrode of the lithium-sulfur battery comprises the following steps:

[0065] (1) Membrane precursor material pretreatment: Arrange the membrane precursor material polyester in isopropanol solution and soak for 10 hours, wash with distilled water for 3 times, place in a vacuum drying oven, and vacuum dry at 60°C for 8 hours for later use;

[0066] (2) Take the filling material superconducting graphite, the stabilizer nano-titanium dioxide and the binder A polytetrafluoroethylene emulsion (PTFE, 60wt%, purchased from Xinxiang Heluolida Power Material Co., Ltd.), the filling material and the binder The mass ratio of A is 1:10, and the mass of the stabilizer is 1% of the mass of the filling substance. After the slurry is adjusted, the slurry is evenly sprayed on the pretreated film precursor material in step (1), and the thickness of the sprayed slurry is 0.2 mm, placed in a vacuum dryin...

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 membrane material for a lithium sulfur battery positive electrode, and belongs to the technical field of electrochemical batteries. The membrane material for making the lithium sulfur battery is designed against the disadvantages of poor conductivity, low active substance utilization rate and the like of traditional lithium sulfur batteries, and has the advantages of multilayer filter screen structure, prosperous gap, high conductivity, simple preparation technology and harmlessness to the environment. The membrane material for the positive electrode is placed between a positive plate and a diaphragm, so the dissolution of the polysulfide in the electrolyte in the charge and discharge process of the battery is effectively inhibited, and the corrosion of the polysulfide to a metallic lithium negative electrode is reduced. The lithium sulfur battery adopting the membrane material has a high active substance utilization rate and stable cycle performances, has an initial discharge specific capacity under a current density of 0.162mA / cm<2>, and still has a discharge specific capacity of above 702mAh / g after 50 times cycle; and compared with traditional lithium sulfur batteries, the lithium sulfur battery adopting the membrane material has the advantages of excellent performances and low cost, and lays a good foundation for the marketization of the lithium sulfur battery.

Description

technical field [0001] The invention specifically relates to a membrane material for the cathode of a lithium-sulfur battery, which belongs to the technical field of electrochemical batteries. Background technique [0002] As technology enters a new era of green energy, indicators such as production cost, cycle life, safety performance, and use efficiency have become important criteria for us to examine energy storage systems. Traditional secondary batteries have disadvantages such as low specific energy, high price, and inability to meet the needs of power vehicles. Therefore, it is particularly important to develop new green secondary batteries with high specific energy, low price and long cycle life. Lithium-sulfur battery is one of the most promising energy storage systems and has become the focus of extensive research in recent years because of its cheap and easy-to-obtain raw materials, environmental friendliness, and high specific energy of the system. [0003] Lith...

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): H01M4/13H01M4/139H01M4/62H01M10/052
CPCH01M4/13H01M4/139H01M4/628H01M10/052Y02E60/10
Inventor 曹朝霞马超尹艳红杨书廷岳红云李向南
Owner HENAN NORMAL 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