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

Preparation method for high-rate-performance sulfur-like positive electrode material namely molybdenum polysulfide nanosheet

A sulfur cathode material, high-rate technology, applied in the field of preparation of electrode materials, can solve the problems of large volume changes, and achieve the effects of high purity, excellent lithium storage performance, and easy synthesis and operation

Inactive Publication Date: 2020-02-21
FUJIAN NORMAL UNIV
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the elemental sulfur and its discharge product Li 2 The insulation of S, the large volume change during charging and discharging, and the "shuttle effect" caused by polysulfides easily soluble in the electrolyte make the practical application of lithium-sulfur batteries face great challenges.

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
  • Preparation method for high-rate-performance sulfur-like positive electrode material namely molybdenum polysulfide nanosheet
  • Preparation method for high-rate-performance sulfur-like positive electrode material namely molybdenum polysulfide nanosheet
  • Preparation method for high-rate-performance sulfur-like positive electrode material namely molybdenum polysulfide nanosheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing molybdenum polysulfide nanosheets of sulfur-like cathode material with high rate performance, comprising the following steps:

[0020] 1) Add 4g (NH 4 ) 6 Mo 7 o 24 • 4H 2 O was dissolved in 80 mL of deionized water by heating to obtain a clear solution, then 40 mL of saturated ammonium polysulfide solution was added to the above clear solution and stirred to mix evenly, then the mixed solution was transferred to a conical flask and heated at 80°C After 5 h, filter at hot temperature;

[0021] 2) After the above filtrate is cooled to room temperature, add 20mL saturated ammonium polysulfide solution, stir to make it evenly mixed, then place it airtightly at room temperature for 18h, then centrifuge to obtain black crystals, and then use water, absolute ethanol, CS 2 and anhydrous ether, and finally dried in vacuum at 80°C for 10 h to obtain the precursor of molybdenum polysulfide nanosheets (NH 4 ) 2 Mo 2 S 12 • 2H 2 O(ATDM).

[0022] 3...

Embodiment 2

[0029] A method for preparing molybdenum polysulfide nanosheets of sulfur-like cathode material with high rate performance, comprising the following steps:

[0030] 1) Mix 6g (NH 4 ) 6 Mo 7 o 24 • 4H 2 O was dissolved in 100 mL of deionized water by heating to obtain a clear solution, and then 20-60 mL of saturated ammonium polysulfide solution was added to the above clear solution and stirred to make it evenly mixed, then the mixed solution was transferred to a conical flask, and mixed at 100 After heating at ℃ for 8 h, filter at hot temperature;

[0031] 2) After the above filtrate is cooled to room temperature, add 24mL saturated ammonium polysulfide solution, stir to mix evenly, and then place it airtightly at room temperature for 20h, then centrifuge to obtain black crystals, and then use water, absolute ethanol, CS 2washed with anhydrous ether, and finally dried under vacuum at 90°C for 12 h to obtain the precursor of molybdenum polysulfide nanosheets (NH 4 ) 2 Mo...

Embodiment 3

[0034] A method for preparing molybdenum polysulfide nanosheets of sulfur-like cathode material with high rate performance, comprising the following steps:

[0035] 1) Mix 2g (NH 4 ) 6 Mo 7 o 24 • 4H 2 O was dissolved in 40 mL of deionized water by heating to obtain a clear solution, then 20 mL of saturated ammonium polysulfide solution was added to the above clear solution and stirred to mix evenly, then the mixed solution was transferred to a conical flask, and heated at 70°C for 3 hours Afterwards, filter at hot temperature;

[0036] 2) After the above filtrate is cooled to room temperature, add 18mL saturated ammonium polysulfide solution, stir to mix evenly, and then place it airtightly at room temperature for 12h, then centrifuge to obtain black crystals, and then use water, absolute ethanol, CS 2 washed with anhydrous ether, and finally dried under vacuum at 50°C for 8 h to obtain the precursor of molybdenum polysulfide nanosheets (NH 4 ) 2 Mo 2 S 12 • 2H 2 O(...

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
Lengthaaaaaaaaaa
Thicknessaaaaaaaaaa
Reversible specific capacityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method for a high-rate-performance sulfur-like positive electrode material namely a molybdenum polysulfide nanosheet. The preparation method comprises the following steps: synthesizing a precursor (NH4)2Mo2S12-2H2O(ATDM) of the molybdenum polysulfide nanosheet, then subjecting the precursor and hydrochloric acid to a simple chemical reaction so as to be able to generate the high-rate-performance sulfur-like positive electrode material namely the molybdenum polysulfide nanosheet with an amorphous layered structure in the air. The material provided by the invention does not need to be filled with mesoporous carbon, can be directly prepared into an electrode, and can show excellent lithium storage performance in a conventional cheap and safer ester electrolyte.

Description

technical field [0001] The invention belongs to the field of preparation of electrode materials, and in particular relates to a preparation method of molybdenum polysulfide nanosheets, a sulfur-like cathode material with high rate performance. Background technique [0002] Lithium-sulfur batteries have attracted widespread attention due to their abundant and pollution-free sulfur raw materials and the high theoretical specific capacity of lithium and sulfur elements. However, due to the elemental sulfur and its discharge product Li 2 The insulating properties of S, the large volume change during charging and discharging, and the "shuttle effect" caused by polysulfides easily soluble in the electrolyte make the practical application of lithium-sulfur batteries face great challenges. Therefore, usually the sulfur positive electrode must be poured into mesoporous carbon or similar porous conductive substrate to form a composite positive electrode to work well, and it also need...

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): C01G39/06H01M4/58H01M10/0525H01M10/058
CPCC01G39/06C01P2002/72C01P2002/85C01P2004/04C01P2004/20C01P2006/80H01M4/5815H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 洪振生陈扬罗兰
Owner FUJIAN 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