A metal thio compound@s composite material and its preparation and application in lithium-sulfur batteries

A technology of metal thio compounds and composite materials, which is applied in lithium batteries, battery electrodes, active material electrodes, etc., can solve the problems of poor lithium conductivity and unsatisfactory electrical properties, and achieve low cost and good lithium ion transmission capacity. Effect

Active Publication Date: 2021-04-20
CENT SOUTH UNIV
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical deficiencies of poor lithium conduction performance and unsatisfactory electrical performance of the existing lithium-sulfur battery coated positive electrode materials, the first purpose of the present invention is to provide a metal sulfide compound@S composite material (the present invention is also referred to as composite materials), aiming at improving the lithium-conducting and electron-conducting properties of sulfur-coated materials, and improving the electrical properties of positive electrode active materials for lithium-sulfur batteries

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
  • A metal thio compound@s composite material and its preparation and application in lithium-sulfur batteries
  • A metal thio compound@s composite material and its preparation and application in lithium-sulfur batteries
  • A metal thio compound@s composite material and its preparation and application in lithium-sulfur batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Preparation of positive electrode material: Weigh 1.6g of elemental S, 3.58g of dimethylammonium dimethyldithiocarbamate and 0.348g of sodium dodecylbenzenesulfonate in 100mL of deionized water for ultrasonic dispersion for 1 hour. After the ultrasound is finished, transfer it to a water bath, set the heating temperature to 70°C, slowly add the prepared 0.05mol / L silver nitrate solution dropwise, react for 12 hours and then cool naturally. The reaction solution was placed in a centrifuge tube and centrifuged at a speed of 8000 r / min, and the centrifuged filter residue was alternately washed three times with deionized water and ethanol and dried at 60° C. for 24 hours to obtain the positive electrode material.

[0074] Lithium-sulfur battery assembly and testing: Slurry prepared with organometallic thio compound-coated sulfur element, acetylene black, and PVDF in a ratio of 6:3:1 was coated on carbon-coated aluminum foil to prepare a positive electrode, and the prepared p...

Embodiment 2

[0076] Preparation of positive electrode material: Weigh 1.6g elemental S, 3.32g sodium dimethyldithiocarbamate and 0.56g N-polyvinylpyrrolidone in 80mL deionized water for ultrasonic dispersion for 1 hour. After the ultrasound is finished, transfer it to a water bath, set the heating temperature to 70°C, slowly add the prepared 0.05mol / L lithium acetate solution dropwise, react for 12 hours and then cool naturally. The reaction solution was placed in a centrifuge tube and centrifuged at a speed of 8000 r / min, and the centrifuged filter residue was alternately washed three times with deionized water and ethanol and dried at 60° C. for 24 hours to obtain the positive electrode material.

[0077] Lithium-sulfur battery assembly and testing: Slurry prepared with organometallic thio compound-coated sulfur element, acetylene black, and PVDF in a ratio of 6:3:1 was coated on carbon-coated aluminum foil to prepare a positive electrode, and the prepared positive electrode sheet was pun...

Embodiment 3

[0079] Preparation of positive electrode material: Weigh 1.6g of elemental S, 3.32g of sodium dimethyldithiocarbamate and 0.56g of sodium dodecylbenzenesulfonate in 80mL of deionized water for ultrasonic dispersion for 1 hour. After the ultrasound is finished, transfer it to a water bath, set the heating temperature to 70°C, slowly add the prepared 0.02mol / L copper chloride solution dropwise, react for 12 hours and then cool naturally. The reaction solution was placed in a centrifuge tube and centrifuged at a speed of 8000 r / min, and the centrifuged filter residue was alternately washed three times with deionized water and ethanol and dried at 60° C. for 24 hours to obtain the positive electrode material.

[0080] Lithium-sulfur battery assembly and testing: Slurry prepared with organometallic thio compound-coated sulfur element, acetylene black, and PVDF in a ratio of 6:3:1 was coated on carbon-coated aluminum foil to prepare a positive electrode, and the prepared positive ele...

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
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
thicknessaaaaaaaaaa
Login to view more

Abstract

The invention relates to a metal thio compound @S composite material and its preparation and application in lithium-sulfur batteries, characterized in that it includes a core and a coating material covering the core; the material of the core is sulfur Simple substance; the coating material is at least one metal thio compound with the structural formula on the right; wherein R is a hydrocarbon group, a tertiary amino group or an ether group, and M is Li, Zn, Cu, Cd, Ca, Bi, Pb, Ni , Sn, Fe, Co or Ag metal elements, n is the chemical valence of M. The organometallic thio compound has good lithium ion transmission ability, ensures lithium ion transmission under tight coating conditions, and can provide a certain electronic conductivity; the coating layer of the present invention is compared with the existing inorganic coating The layer is more elastic, which can alleviate the volume change during the charging and discharging process of elemental sulfur, which causes the coating layer to break and fall off. The organometallic thio compounds themselves can provide a certain capacity.

Description

technical field [0001] The invention relates to a method for preparing a lithium-sulfur battery positive electrode material and an application thereof, belonging to the field of lithium-sulfur secondary batteries. Background technique [0002] With the development of society, on the one hand, the performance requirements of the public for portable electronic products are constantly improving; The grid began to develop rapidly. These two reasons make people have higher and higher requirements for the energy density and power density of lithium-ion batteries. However, due to the limitation of the theoretical lithium storage capacity of the battery system and electrode materials, it is difficult for the current lithium-ion battery system with the best comprehensive performance Meet the requirements of the future society for high specific energy. [0003] Lithium-sulfur batteries have become the most promising substitutes for lithium-ion batteries because their theoretical ene...

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 Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/366H01M4/38H01M4/624H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 赖延清洪波向前王大鹏张治安张凯方静
Owner CENT SOUTH 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