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

Double metal selenide Fe2CoSe4 material of porous structure and preparation method and application thereof

A selenide, bimetallic technology, applied in selenium/tellurium compounds, chemical instruments and methods, elemental compounds other than selenium/tellurium, etc. problems such as low potential, to achieve good electrochemical performance, excellent cycle stability, and good capacity retention.

Active Publication Date: 2018-11-27
PEKING UNIV
View PDF3 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although sodium-ion batteries have the above advantages, there are still the following problems: 1. The mass of sodium ions is heavier and the radius is larger, resulting in slower deintercalation of sodium ions in electrode materials, which affects the cycle performance and rate performance of batteries; 2. , The redox potential of sodium is lower, resulting in a lower energy density of sodium-ion batteries than lithium-ion batteries
[0005] Although the above methods can improve the cycle performance of sodium-ion batteries to a certain extent, the improvement range is limited. The main reason may be that the above-mentioned materials cannot effectively accommodate the volume of the negative electrode material caused by the insertion and extraction of sodium ions during the charging and discharging process. changes, thus leading to the collapse of the electrode structure and degrading the cycle performance

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
  • Double metal selenide Fe2CoSe4 material of porous structure and preparation method and application thereof
  • Double metal selenide Fe2CoSe4 material of porous structure and preparation method and application thereof
  • Double metal selenide Fe2CoSe4 material of porous structure and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Dissolve 0.75mmol of ferric nitrate in 60mL of isopropanol, then add 0.25mmol of cobalt nitrate into this solution, then add 30mL of glycerol, obtain a transparent light brown solution under magnetic stirring, and then The solvothermal reaction was carried out at ℃. After reacting for 6 hours, the reaction product was taken out, centrifuged, washed with ethanol and dried, and placed in a quartz boat together with the selenium powder for selenization treatment. The selenization reaction conditions are under the atmosphere of argon hydrogen (wherein the volume percentage of hydrogen is 10%), the heating rate is 4°C / min, the reaction temperature is 300°C, the reaction time is 4h, and then the heating rate is 2°C / min Slowly heated to 400°C, annealed in a nitrogen atmosphere for 1.5 hours, and naturally cooled to room temperature to obtain a porous double metal selenide Fe 2 CoSe 4 Material.

[0027] like figure 1 As shown, it can be seen by transmission electron microsc...

Embodiment 2

[0032] The double metal selenide Fe of the porous structure that embodiment 1 prepares 2 CoSe 4 The nanomaterials are ground into powder, coated on copper foil, and tested for the cycle performance of sodium-ion batteries.

[0033] like Figure 5 As shown, the anode material of the sodium ion battery has a high initial specific capacity of 750mAh / g when the current density is 1000mA / g, and its specific capacity can still be maintained at 614.5mAh / g after 100 cycles, and the cycle performance is stable .

[0034] like Image 6 As shown, the specific capacity of the anode material for sodium ion batteries can still reach 350.9mAh / g after 5000 cycles at a current density of 4000mA / g, which has good cycle performance and high rate performance, and its Coulombic efficiency is almost maintained Around 100%.

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
radiusaaaaaaaaaa
radiusaaaaaaaaaa
current efficiencyaaaaaaaaaa
Login to View More

Abstract

The invention discloses a double metal selenide Fe2CoSe4 material of a porous structure and a preparation method and an application thereof. The preparation method comprises the following steps: carrying out a solvothermal reaction on ionic salt of ferrum and ionic salt of cobalt in an organic solvent to form a ferric and cobalt precursor; then selenizing the precursor to obtain a porous sphericalmaterial, the diameter of which is 200-260 nm, wherein the specific surface area of the material is 81.21 m<2> / g. The volume change of a cathode material in a charging process can be accommodated effectively. The conductivity of the material can be improved well as a result of the mesoporous property and large specific surface area of the material, and the volume change of the cathode material inthe charging process can be accommodated effectively, so that good electrochemical properties can be generated. The material as the cathode material of a sodium ion battery shows excellent cyclic stability, and is good in capacity retaining rate and is slow in capacity fading.

Description

technical field [0001] The invention relates to a negative electrode material for a sodium ion battery, in particular to a double metal selenide Fe with a nanoporous structure 2 CoSe 4 Materials and their preparation methods. Background technique [0002] A sodium ion battery is a battery that realizes charging and discharging through the intercalation and deintercalation process of sodium ions between the positive and negative electrode materials. Compared with lithium-ion batteries, sodium-ion batteries have more abundant sodium reserves, wider distribution, and lower cost, and have similar physical and chemical properties to lithium. It is expected to replace traditional lithium-ion batteries in large-scale energy storage device applications. [0003] Although sodium-ion batteries have the above advantages, there are still the following problems: 1. The mass of sodium ions is heavier and the radius is larger, resulting in slower deintercalation of sodium ions in electro...

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): C01B19/00H01M4/58H01M10/054
CPCC01B19/002C01P2002/72C01P2002/85C01P2004/03C01P2004/04H01M4/581H01M10/054Y02E60/10
Inventor 侯仰龙梓杉·阿里
Owner PEKING 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