A kind of maltose derived carbon/lithium sulfide composite electrode material and its preparation method and application

A composite electrode, maltose technology, applied in the direction of positive electrode, battery electrode, lithium battery, etc., can solve the problems of unsolved polysulfide shuttle effect, limited research on lithium sulfide insulation characteristics, and reduced battery safety performance, etc., to reduce irreversible capacity. , Improve the rate performance and cycle performance, and promote the effect of high energy density

Active Publication Date: 2022-04-12
ZHEJIANG UNIV
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some inherent defects in lithium-sulfur batteries that hinder its further development: 1) The shuttle effect of intermediate products (polysulfides) leads to the generation of irreversible capacity, reduces the Coulombic efficiency, and greatly limits its cycle. stability
2) The dendrite problem of lithium metal leads to the breakdown of the diaphragm and reduces the safety performance of the battery
However, the use of lithium sulfide as the cathode has not yet solved the shuttle effect of polysulfides, and the insulating properties of lithium sulfide further limit its research.

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 kind of maltose derived carbon/lithium sulfide composite electrode material and its preparation method and application
  • A kind of maltose derived carbon/lithium sulfide composite electrode material and its preparation method and application
  • A kind of maltose derived carbon/lithium sulfide composite electrode material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Wash the purchased glutinous rice, pour it into a pot and cook it, stir it with the chopped malt, and let it ferment for 4-6 hours until the juice is transformed. Then the juice is filtered out and boiled at high temperature into a paste, which becomes amber-shaped sugar lumps after cooling. Lithium sulfate solution was prepared with lithium sulfate and deionized water. The mass ratio of lithium sulfate, deionized water, and maltose was 1:2:4. The solution was poured into maltose and stirred for 30 minutes, and then freeze-dried in a freeze dryer for 24 hours. The precursor obtained by freeze-drying was preheated at 600 °C for 4 hours in argon, and then transferred to a tube furnace for sintering at 850 °C for 3 hours. The heating rate was 5 °C / min. After cooling, maltose-derived carbon / lithium sulfide was obtained. composite material.

Embodiment 2

[0036] Wash the purchased glutinous rice, pour it into a pot and cook it, stir it with the chopped malt, and let it ferment for 4-6 hours until the juice is transformed. Then the juice is filtered out and boiled at high temperature into a paste, which becomes amber-shaped sugar lumps after cooling. Lithium sulfate solution was prepared with lithium sulfate and deionized water. The mass ratio of lithium sulfate, deionized water, and maltose was 1:2:4. The solution was poured into maltose and stirred for 30 minutes, and then freeze-dried in a freeze dryer for 24 hours. The precursor obtained by freeze-drying was preheated at 600 °C for 4 hours in argon, and then transferred to a tube furnace for sintering at 850 °C for 5 hours. The heating rate was 5 °C / min. After cooling, maltose-derived carbon / lithium sulfide was obtained. composite material.

Embodiment 3

[0038] Wash the purchased glutinous rice, pour it into a pot and cook it, stir it with the chopped malt, and let it ferment for 4-6 hours until the juice is transformed. Then the juice is filtered out and boiled at high temperature into a paste, which becomes amber-shaped sugar lumps after cooling. Lithium sulfate solution was prepared with lithium sulfate and deionized water. The mass ratio of lithium sulfate, deionized water, and maltose was 1:2:4. The solution was poured into maltose and stirred for 30 minutes, and then freeze-dried in a freeze dryer for 24 hours. The precursor obtained by freeze-drying was preheated at 600 °C for 4 hours in argon, and then transferred to a tube furnace for sintering at 850 °C for 4 hours. The heating rate was 5 °C / min. After cooling, maltose-derived carbon / lithium sulfide was obtained. composite material.

[0039] figure 1 It is a scanning electron microscope image of the maltose-derived carbon / lithium sulfide composite material 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
thicknessaaaaaaaaaa
mesoporeaaaaaaaaaa
current efficiencyaaaaaaaaaa
Login to view more

Abstract

The invention discloses a maltose-derived carbon / lithium sulfide composite material and its preparation method and application. Lithium sulfide three-dimensional porous composites of maltose-derived carbon. The composite material of the present invention has the characteristics of high specific surface area, high cycle stability, rate performance and coulombic efficiency, and is especially suitable as a cathode material for lithium-sulfur batteries. Development of energy-dense, high-stability lithium-sulfur batteries.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium-sulfur batteries, in particular to a maltose-derived carbon / lithium sulfide composite electrode material and a preparation method and application thereof. Background technique [0002] So far, lithium-ion batteries are still the most widely used batteries in commercialization. However, with social development and social progress, its low energy density (200-250Wh / kg) has been unable to meet the society's requirements for high energy density batteries. Therefore, it is urgent to explore new high-energy-density battery systems. Among the many battery systems, lithium-sulfur batteries have received the most attention because of their high energy density (2600Wh / kg) and bulk density (2800Wh / L), twice that of commercial lithium-ion batteries. The sulfur cathode has a theoretical capacity of 1675 mAh / g, and is inexpensive and environmentally friendly, and has also attr...

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): H01M4/36H01M4/58H01M4/583H01M10/052
CPCH01M4/366H01M4/5815H01M4/583H01M10/052H01M2004/028H01M2004/021Y02E60/10
Inventor 夏新辉沈盛慧王秀丽涂江平
Owner ZHEJIANG 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