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

Lithium vanadate with indium and cerium or indium-doped nanofiber structure as well as preparation method and application of lithium vanadate

A nanofiber and indium doping technology, which is applied in structural parts, fiber chemical characteristics, rayon manufacturing, etc., can solve the problems of time-consuming, complicated preparation process, and high energy consumption, and achieve simple process, uniform particle size distribution, The effect of large specific surface area

Active Publication Date: 2021-07-02
CENT SOUTH UNIV
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its preparation process is complex, energy-intensive, and time-consuming

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
  • Lithium vanadate with indium and cerium or indium-doped nanofiber structure as well as preparation method and application of lithium vanadate
  • Lithium vanadate with indium and cerium or indium-doped nanofiber structure as well as preparation method and application of lithium vanadate
  • Lithium vanadate with indium and cerium or indium-doped nanofiber structure as well as preparation method and application of lithium vanadate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] First, dissolve 0.5733g of lithium acetate in a solution consisting of 8.875mL of ethanol, 0.955mL of glacial acetic acid, and 4mL of deionized water, and stir at 50°C and 600r / min for 10min to form a transparent solution. Then add 0.3278g of citric acid monohydrate, 0.5g of ascorbic acid, and 0.2925g of ammonium metavanadate into the transparent solution, and continue to stir for 6 hours (exploring and finding that for the reaction system of this example, the stirring time needs to be at least 6 hours, otherwise the expected Morphology, the comparative example with insufficient stirring time is given later), and a dark brown solution is formed. Finally, 0.02273g ceric sulfate tetrahydrate (Ce(SO 4 ) 2 4H 2 O), 0.07767g indium sulfate and 0.8g polyvinylpyrrolidone (PVP) were added to the dark brown solution, and stirred for 3h to obtain the electrospinning precursor solution.

[0067] The positive pressure of electrospinning is 15kV, the negative pressure is -1kV, th...

Embodiment 2

[0070] The steps of this example are exactly the same as Example 1, only the choice of doping salt is different. The doping salt only selects the indium sulfate doping of the same dosage as that of Example 1, and obtains the required doping Li after calcination. 3 VO 4 Material (LIVO).

[0071] The obtained materials were assembled into a coin cell according to the method of Example 1 for rate performance test. Rate performance test voltage range is 0.01~3V, current density is 50~5000mA g -1 . The rate performance test results are as follows: Figure 4 As shown, it can be seen that only indium-doped Li 3 VO 4 , through electrospinning and subsequent calcination steps, doped Li with excellent rate performance can still be obtained 3 VO 4 Material.

Embodiment 3

[0073] With 0.3672g lithium hydroxide, 0.6629g vanadyl acetylacetonate, 0.02273g ceric sulfate tetrahydrate (Ce(SO 4 ) 2 4H 2 O), 0.07767g of indium sulfate was added to 12mL of N,N-dimethylformamide (DMF). Stir at 50°C and 600r / min for 3h to form a dark brown solution. Finally, 0.5 g of polyvinylpyrrolidone (PVP) and 0.5 g of polyacrylonitrile (PAN) were added, and stirring was continued for 3 h to obtain an electrospinning precursor solution.

[0074] The positive pressure of electrospinning is about 13kV, the negative pressure is -1kV, the distance between the syringe needle and the aluminum foil is 15cm, and the advancing speed of the needle tube is 0.060mm / min. The resulting spun product was kept in an Ar atmosphere at 700°C for 3 hours in a tube furnace to obtain the required doped Li 3 VO 4 Material (LICVO-1), heating rate 3°C / min.

[0075] The morphology and particle size of the sample were observed with a Nova NanoSEM 230 scanning electron microscope from FEI Co...

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 discloses lithium vanadate with an indium and cerium or indium-doped nanofiber structure as well as a preparation method and application of the lithium vanadate. A synthesis mode is simple and easy to control. Firstly, an indium and cerium or indium-doped Li3VO4 precursor is synthesized by adopting electrostatic spinning, and calcining is performed in inert gas to obtain an indium and cerium or indium-doped Li3VO4 material with a fiber structure. A unique fiber network conductive structure not only facilitates effective infiltration of an electrolyte, but also enables the electrolyte to be in full contact with an active substance, so that the electrochemical performance of the material is improved. The fiber network-shaped indium and cerium or indium-doped Li3VO4 prepared by the method has good electrochemical performance when being used as a lithium ion electrode material, the process is simple, and the condition is mild.

Description

technical field [0001] The invention belongs to the technical field of lithium battery electrode preparation, and in particular relates to lithium vanadate with indium cerium or indium doped nanofiber structure and its preparation method and application. Background technique [0002] Li 3 VO 4 Because of its high energy density and low redox potential (0.5-1V vs. Li + / Li), with small strain during charge and discharge and easy synthesis, has been widely studied as anode material for lithium-ion batteries. When 3 lithium ions are intercalated, its theoretical capacity can reach 540mAh g -1 . However, the electronic conductivity of the material is poor, Li + The diffusion coefficient of ions is low, and when used as electrodes of lithium-ion batteries, the rate performance is poor, and its morphology is also difficult to control. Therefore, researchers have focused on Li with different morphology micro-nano structures, high capacity and high rate performance. 3 VO 4 M...

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): D01F9/08D01F1/10H01M4/485H01M10/0525
CPCD01F9/08D01F1/10H01M4/485H01M10/0525H01M2004/021Y02E60/10
Inventor 潘安强万远浪谢雪芳
Owner CENT SOUTH 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