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

Nitrogen and sulfur co-doped graphene-loaded cobalt selenide-coated positive electrode material and preparation method thereof

A nitrogen-sulfur co-doping, cathode material technology, applied in battery electrodes, electrochemical generators, electrical components, etc., can solve the problem that lithium-ion batteries cannot have good rate performance and structural stability at the same time, and achieve good coating Protection effect, improve stability, improve transmission rate effect

Inactive Publication Date: 2019-05-17
GEM WUXI ENERGY MATERIAL CO LTD
View PDF5 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above problems, the object of the present invention is to provide a nitrogen-sulfur co-doped graphene-supported cobalt selenide-coated positive electrode material and a preparation method, aiming at solving the problem that the lithium-ion battery made by the current positive electrode material cannot simultaneously have good Technical Issues of Rate Capability and Structural Stability

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
  • Nitrogen and sulfur co-doped graphene-loaded cobalt selenide-coated positive electrode material and preparation method thereof
  • Nitrogen and sulfur co-doped graphene-loaded cobalt selenide-coated positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] In this embodiment, the preparation method of the nitrogen-sulfur co-doped graphene-loaded cobalt selenide-coated positive electrode material comprises:

[0023] Step S1, adding graphite oxide into the aqueous solution of nitrogen- and sulfur-containing compounds, and ultrasonically dispersing to obtain a uniformly mixed aqueous solution.

[0024] In this step, the ultrasonic dispersion time is 20-60min, the concentration of graphite oxide in the uniformly mixed aqueous solution is 5g / L, the concentration of the nitrogen- and sulfur-containing compound is 0.025mol / L, and the nitrogen- and sulfur-containing The elemental compound is one or more of L-cysteine, thiourea, mercaptoethylamine, glutathione or methionine.

[0025] Step S2, reacting the aqueous solution at a certain temperature to obtain nitrogen-sulfur co-doped graphene hydrogel, and then freeze-drying to obtain nitrogen-sulfur co-doped graphene.

[0026] In this step, the reaction temperature is 60-90° C., an...

Embodiment 1

[0033] 1) Add graphite oxide into an aqueous solution of L-cysteine ​​containing 0.025mol / L, the concentration of graphite oxide is 5g / L, ultrasonically disperse for 30min to obtain a uniformly mixed aqueous solution, and react at 80°C for 1h to obtain nitrogen-sulfur co- Doped graphene hydrogel, obtained nitrogen-sulfur co-doped graphene after freeze-drying;

[0034] 2) Disperse nitrogen-sulfur co-doped graphene in step 1 in Co(OAc) containing 50mmol / L 2 ·H 2 O and 50mmol / L Na 2 SeO 3 In the diethylenetriamine solution, the concentration of doped graphene is 5g / L, after ultrasonication for 30min, it is transferred to a high-pressure reactor, and reacted at 140°C for 18h, after cooling, it is suction filtered and washed three times with water to remove impurities, and freeze-dried Finally, a nitrogen-sulfur co-doped graphene-loaded cobalt selenide material is obtained;

[0035] 3) Mix the nitrogen-sulfur co-doped graphene-loaded cobalt selenide material in step 2 with the ...

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

No PUM Login to View More

Abstract

The invention is applicable to the technical field of a lithium battery technology, and provides a nitrogen and sulfur co-doped graphene-loaded cobalt selenide-coated positive electrode material and apreparation method thereof. During the preparation process, cobalt nelenide is loaded onto a graphene material, the mutual effect between the graphene material and Li can be improved due to presenceof a group containing elements N and S, a good coating protection effect is achieved, the mutual effect between the positive electrode material and an electrolyte is prevented, the volume effect generated by the material during the charge-discharge process can be effectively reduced by a hole structure of the graphene body, and the stability of the material structure is improved; and meanwhile, graphene has favorable conductivity, the cobalt selenide is a negative electrode material and is a lithium ion conductor, the lithium ion transmission rate can be improved by synergic effect of the graphene and the cobalt selenide, and finally, the lithium ion battery has excellent rate performance and cycle property and also has favorable safety.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a nitrogen-sulfur co-doped graphene-loaded cobalt selenide-coated positive electrode material and a preparation method. Background technique [0002] Nickel-cobalt-manganese ternary lithium-ion battery cathode materials are widely used in IT products and new energy vehicles due to their high energy density and relatively simple preparation process. However, due to the poor structural stability of pure nickel-cobalt-manganese oxide (LNCM), it is easy to collapse the material structure due to the deintercalation of Li ions and the change of the valence state of Ni, Co, and Mn ions during the charging and discharging process. The cycle life and safety will cause great harm. Surface coating is an effective method to improve the electrical properties of ternary materials. Effective surface coating can reduce the side reaction between battery materials and electr...

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): H01M4/36H01M4/505H01M4/525H01M4/58H01M4/583H01M10/0525
CPCY02E60/10
Inventor 许开华周晓燕徐世国张玉军廖宁靖
Owner GEM WUXI ENERGY MATERIAL CO LTD
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com