Method for preparing lithium-sulfur battery with TiO2 being as additive

A lithium-sulfur battery and additive technology, which is applied in lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of low coulombic efficiency, shorten battery cycle life, and restrict the practical progress of lithium-sulfur batteries, and achieve the improvement of coulombic efficiency Effect

Inactive Publication Date: 2019-12-31
QUFU NORMAL UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium-sulfur batteries face many problems that need to be solved. For example, lithium polysulfide, an intermediate product of the sulfur electrode, is easily dissolved in the organic electrolyte system and causes a "shuttle effect", which leads to low Coulombic efficiency and shortens the cycle life of the battery. The practical progress of lithium-sulfur 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
  • Method for preparing lithium-sulfur battery with TiO2 being as additive
  • Method for preparing lithium-sulfur battery with TiO2 being as additive
  • Method for preparing lithium-sulfur battery with TiO2 being as additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The active material (sulfur + TiO 2 ), acetylene black and polytetrafluoroethylene (PTFE), the mass ratio of the three is 60:30:10, dispersed in the ethanol solution, the quality of ethanol is 100 times the mass of the active substance, ultrasonic 30 minutes under 40MHZ, and then The dispersion liquid was placed in a ball mill tank, and ball milled at a speed of 400 rpm for 12 hours to obtain a slurry. Apply the slurry on the aluminum foil and dry it in a blast drying oven; then place it in a vacuum drying oven and dry it under vacuum (less than -0.8Mpa) at 50 degrees Celsius for 12 hours. That is, the positive electrode sheet of the lithium-sulfur battery is obtained. The selected TiO 2 The material is mesoporous spherical TiO 2 (diameter 250nm, pore size 4nm). TiO 2 The proportion of the active substance is 0.2wt%.

Embodiment 2

[0022] The active material (sulfur + TiO 2 ), acetylene black and polytetrafluoroethylene (PTFE), the mass ratio of the three is 60:30:10, dispersed in the ethanol solution, the quality of ethanol is 100 times the mass of the active substance, ultrasonic 30 minutes under 40MHZ, and then The dispersion liquid was placed in a ball mill tank, and ball milled at a speed of 400 rpm for 12 hours to obtain a slurry. Apply the slurry on the aluminum foil and dry it in a blast drying oven; then place it in a vacuum drying oven and dry it under vacuum (less than -0.8Mpa) at 50 degrees Celsius for 12 hours. That is, the positive electrode sheet of the lithium-sulfur battery was obtained. The selected TiO 2 The material is mesoporous spherical TiO 2 (diameter 250nm, pore size 4nm). TiO 2 The proportion of the active substance is 0.5wt%.

Embodiment 3

[0024] The active material (sulfur + TiO 2 ), acetylene black and polytetrafluoroethylene (PTFE), the mass ratio of the three is 60:30:10, dispersed in the ethanol solution, the quality of ethanol is 100 times the mass of the active substance, ultrasonic 30 minutes under 40MHZ, and then The dispersion liquid was placed in a ball mill tank, and ball milled at a speed of 400 rpm for 12 hours to obtain a slurry. Apply the slurry on the aluminum foil and dry it in a blast drying oven; then place it in a vacuum drying oven and dry it under vacuum (less than -0.8Mpa) at 50 degrees Celsius for 12 hours. That is, the positive electrode sheet of the lithium-sulfur battery was obtained. The selected TiO 2 The material is mesoporous spherical TiO 2 (340nm diameter, 20nm pore size). TiO 2 The proportion of the active substance is 1wt%.

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
diameteraaaaaaaaaa
pore sizeaaaaaaaaaa
diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for preparing a lithium-sulfur battery with TiO2 being as an additive. The method comprises the following steps: dispersing active substances, acetylene black and polytetrafluoroethylene in an ethanol solution according to a mass ratio of 60: 30: 10, wherein the mass of ethanol is 100 times that of the active substance, and carrying out ultrasonic treatment to obtain dispersion liquid; then, putting the dispersion liquid into a ball milling tank for ball milling to obtain slurry; coating the slurry onto an aluminum foil, and carrying out drying in a blast drying oven; and finally, putting the obtained aluminum foil into a vacuum drying oven, and carrying out drying for 12 hours at 50 DEG C in vacuum (lower than-0.8 Mpa) to obtain a positive pole piece of the lithium-sulfur battery. After TiO2 is added, the coulombic efficiency of the sulfur-lithium battery is obviously improved.

Description

technical field [0001] The present invention relates to the invention of lithium-sulfur battery additives in the field of new energy, in particular to a TiO 2 Preparation method of lithium-sulfur battery as an additive. Background technique [0002] Lithium-sulfur battery is one of the chemical power sources with great application prospects. It uses elemental sulfur as the positive electrode and metal lithium as the negative electrode. Its theoretical specific energy is as high as 2600Wh / kg. Therefore, it has many advantages such as high specific energy, low price, and environmental friendliness. However, lithium-sulfur batteries face many problems that need to be solved. For example, lithium polysulfide, an intermediate product of the sulfur electrode, is easily dissolved in the organic electrolyte system and causes a "shuttle effect", which leads to low Coulombic efficiency and shortens the cycle life of the battery. The practical progress of lithium-sulfur batteries. ...

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): H01M4/139H01M4/13H01M4/62H01M10/052
CPCH01M4/62H01M10/052H01M4/13H01M4/139Y02E60/10
Inventor 朱坤磊于洋李梦婷景志红刘西成
Owner QUFU NORMAL 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