Long-service-life and high-specific-capacity poly-dopamine-coated hollow sulfur microsphere composite positive electrode material and preparation method thereof

A composite positive electrode material, polydopamine technology, applied in battery electrodes, electrical components, non-aqueous electrolyte storage batteries, etc., can solve the problems that restrict the marketization of lithium-sulfur batteries, poor cycle performance and poor rate performance of lithium-sulfur batteries, and achieve high The effects of rate performance, high specific capacity, and convenient operation

Inactive Publication Date: 2014-06-11
GUANGZHOU HKUST FOK YING TUNG RES INST
View PDF2 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conductivity of elemental sulfur itself is poor (at room temperature 25°C, the conductivity is only 5×10-30 S/cm), and the polysulfides formed with lithium ions during charge and discharge It is easily soluble in organic electrolyte, which leads to the disadvantages of poo

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
  • Long-service-life and high-specific-capacity poly-dopamine-coated hollow sulfur microsphere composite positive electrode material and preparation method thereof
  • Long-service-life and high-specific-capacity poly-dopamine-coated hollow sulfur microsphere composite positive electrode material and preparation method thereof
  • Long-service-life and high-specific-capacity poly-dopamine-coated hollow sulfur microsphere composite positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example one

[0027] first step: Slowly add 50 ml of 4% sodium thiosulfate aqueous solution to 100 ml of 3% polyvinylpyrrolidone (PVP, molecular weight 40000) aqueous solution with a mass concentration of 3%, and stir for 60 minutes at a rate of 300 rpm; Add 50 ml of a 2% aqueous hydrochloric acid solution slowly and stir at 300 rpm for 120 minutes. After the reaction is completed, the product is filtered and washed to obtain hollow sulfur microspheres with a particle diameter of about 460 nanometers. (see figure 1 ).

[0028] The second step: The hollow sulfur microspheres were dispersed into 100 ml of dopamine aqueous solution with a mass concentration of 1% and a pH of 8.5, and stirred at a rate of 200 rpm for 16 hours. After the reaction was completed, the product was filtered, washed and vacuum dried ( The absolute vacuum degree is 1000 Pa, the drying temperature is 60°C, and the drying time is 10 hours. Finally, polydopamine-coated hollow sulfur microspheres with ...

Example Embodiment

[0031] Example two

[0032] first step: Except that polyvinylpyrrolidone with a molecular weight of 50,000 is used as the surfactant, the other operation steps are the same as in Example 1.

[0033] The second step: Disperse the hollow sulfur microspheres into 100 ml of dopamine aqueous solution with a mass concentration of 2% and a pH of 8.5, and stir at 500 rpm for 10 hours. After the reaction is completed, the product is filtered, washed and vacuum dried ( The absolute vacuum is 5000 Pa, the drying temperature is 200°C, and the drying time is 10 hours), and finally polydopamine-coated hollow sulfur microspheres with a particle diameter of 540 nm are obtained.

[0034] third step: Same as the first embodiment.

[0035]

Example Embodiment

[0036] Example three

[0037] first step: Pour the pre-prepared 50 ml of 3% aqueous ammonium thiosulfate solution slowly into 100 ml of 4% polyethylene glycol (molecular weight 1000) aqueous solution, and stir at 400 revolutions per minute. 60 minutes; then slowly add 50 ml of hydrochloric acid aqueous solution with a mass concentration of 1.8%, and stir for 120 minutes at a rate of 500 revolutions per minute. After the reaction is completed, the product is filtered and cleaned to obtain a particle diameter of about 500 nanometers Hollow sulfur microspheres.

[0038] The second step: Disperse the hollow sulfur microspheres into 100 ml of dopamine aqueous solution with a mass concentration of 1% and a pH of 8.2, and stir at 200 rpm for 20 hours. After the reaction is complete, the product is filtered, washed and vacuum dried (absolutely The vacuum degree is 100 Pa, the drying temperature is 50°C, and the drying time is 15 hours), and finally polydopamine-coated hollow sulfur mic...

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
Diameteraaaaaaaaaa
Diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a long-service-life and high-specific-capacity poly-dopamine-coated hollow sulfur microsphere composite positive electrode material and a preparation method thereof. The preparation method comprises the following steps: preparing hollow sulfur microspheres through reaction of a surfactant, a sulfur-containing agent and acid; dispersing the hollow sulfur microspheres in a poly-dopamine water solution and after the reaction is finished, filtering, washing and carrying out vacuum drying a product to obtain the poly-dopamine-coated hollow sulfur microsphere composite positive electrode material. The preparation method has the advantages of the preparation process is simple, the operation is convenient and material performance is excellent; the prepared poly-dopamine-coated hollow sulfur microsphere composite positive electrode material is high in discharge specific capacity and good in cycling performance. is used as a positive electrode material of a lithium sulfur battery, the composite material has a wide application prospect in mobile communication, portable electronic devices, electric automobiles, energy storage and the relevant fields.

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium batteries, in particular to a polydopamine-coated hollow sulfur microsphere composite cathode material with long life and high specific capacity and a preparation method thereof. Background technique [0002] With the rapid development of related fields such as mobile communications, portable electronic devices, electric vehicles and energy storage devices, higher and higher requirements are put forward for the performance of batteries, especially energy density, cycle life and rate. Therefore, it is of great strategic significance to develop new lithium-ion secondary batteries with high performance, low cost and environmental friendliness. The performance and price of cathode materials are the bottlenecks that restrict the further development of lithium-ion batteries to high energy, long life and low cost. Existing LiFePO 4 , LiMn 2 o 4 And cathode materials such as tern...

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): H01M4/36H01M4/38
CPCH01M4/139H01M4/362H01M4/366H01M10/052Y02E60/10
Inventor 徐辉邓远富覃旭松陈国华
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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