Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Lithium vanadium fluorophosphate silicate positive electrode material and preparation method thereof

A technology of lithium vanadium silicate and positive electrode materials, which is applied in the direction of fluosilicic acid, positive electrodes, lithium batteries, etc., to achieve the effects of excellent rate, low cost, and excellent cycle performance

Active Publication Date: 2021-09-24
XI AN JIAOTONG UNIV
View PDF15 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All kinds of materials have their own characteristics in terms of safety, conductivity, specific capacity, potential platform, charge-discharge rate, cycle life, working conditions and economy, but there is still a lack of a material with these excellent properties at the same time. 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
  • Lithium vanadium fluorophosphate silicate positive electrode material and preparation method thereof
  • Lithium vanadium fluorophosphate silicate positive electrode material and preparation method thereof
  • Lithium vanadium fluorophosphate silicate positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment is a lithium vanadium fluorophosphosilicate positive electrode material, and its chemical formula is: LiVP 0.9 Si0.1 o 4 F, the specific preparation method comprises the following steps:

[0029] 1. Weigh the vanadium source, silicon source, phosphorus source and carbon source according to the molar ratio of 1:0.1:0.9:1.05, use absolute ethanol as the dispersant, ball mill, disperse and mix in a ball mill for 12 hours.

[0030] 2. Place the ball-milled mixture in an oven to dry, grind, press into tablets, and sinter at 700°C for 6 hours in an inert atmosphere.

[0031] 3. The product after sintering is weighed with the lithium source according to the ratio of 1:1.02 in molar ratio, and then adding a carbon source and a fluorine source with a mass ratio of 6% and 20% respectively, with dehydrated alcohol as a dispersant, in Mill, disperse and mix in a ball mill for 18 hours.

[0032] 4. Dry the mixture in an oven, grind, press into tablets, and sinter ...

Embodiment 2

[0045] This embodiment is a lithium vanadium fluorophosphosilicate positive electrode material, and its chemical formula is: LiVP 0.8 Si 0.2 o 4 F, the specific preparation method comprises the following steps:

[0046] 1. Weigh the vanadium source, silicon source, phosphorus source and carbon source according to the molar ratio of 1:0.2:0.8:0.9, use absolute ethanol as the dispersant, ball mill, disperse and mix in a ball mill for 12 hours.

[0047] 2. Place the ball-milled mixture in an oven to dry, grind, press into tablets, and sinter at 750°C for 4 hours in an inert atmosphere.

[0048] 3. The product after sintering is weighed according to the molar ratio of 1:1.04 with the lithium source, and the carbon source and the fluorine source are added with a mass ratio of 15% and 10%, respectively, and dehydrated alcohol is used as a dispersant. Mill, disperse and mix in a ball mill for 18 hours.

[0049] 4. Dry the mixture in an oven, grind, press into tablets, and sinter ...

Embodiment 3

[0060] This embodiment is a lithium vanadium fluorophosphosilicate positive electrode material, and its chemical formula is: LiVP 0.6 Si 0.4 o 4 F, the specific preparation method comprises the following steps:

[0061] 1. Weigh the vanadium source, silicon source, phosphorus source and carbon source according to the molar ratio of 1:0.4:0.6:1, and use the mixture of absolute ethanol and deionized water according to the volume ratio of 7:3 as the dispersant, Ball mill, disperse and mix in a ball mill for 12 hours.

[0062] 2. Place the ball-milled mixture in an oven to dry, grind, press into tablets, and sinter at 700°C for 6 hours in an inert atmosphere.

[0063] 3. Weigh the sintered product with lithium source and fluorine source according to the molar ratio of 1:1:1, then add carbon source and fluorine source with mass ratio of 20% and 2% respectively, and use absolute ethanol The mixture of deionized water and deionized water according to the volume ratio of 7:3 is us...

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 relates to a lithium vanadium fluorophosphate silicate positive electrode material and a preparation method thereof, the molecular formula of the lithium vanadium fluorophosphate silicate positive electrode material is LiVP1-xSixO4F (0 < x < 1), and the preparation method comprises the following steps: 1 ball-milling, dispersing and mixing a vanadium source, a silicon source, a phosphorus source and a carbon source in a ball mill by taking absolute ethyl alcohol, deionized water or a mixture of absolute ethyl alcohol and deionized water in any proportion as a dispersing agent; 2 sintering the ball-milled mixture in an inert atmosphere; 3 mixing the sintered product with a lithium source, a fluorine source, a carbon source and a fluorine source, and carrying out ball milling and dispersion; and 4 drying the mixture, grinding, tabletting, and sintering in an inert atmosphere to obtain the target product LiVP1-xSixO4F. The lithium vanadium fluorophosphate silicate LiVP1-xSixO4F (x is more than 0 and less than 1) prepared by a simple solid-phase sintering method has the remarkable advantages of stable structure, good safety, large specific capacity, high potential platform, small polarization, high charge-discharge rate, stable circulation and the like, and is a novel positive electrode active material of a high-performance lithium battery which is easy for large-scale production and has a great market prospect.

Description

technical field [0001] The invention relates to the technical field of lithium battery anode materials and manufacturing thereof, in particular to a lithium fluorophosphosilicate vanadium anode material and a preparation method thereof. Background technique [0002] In the face of the increasingly severe global energy crisis and deteriorating environmental pollution, rechargeable lithium batteries have shown huge technical advantages and broad application markets in the field of efficient and environmentally friendly energy storage. Compared with other electric energy storage devices, rechargeable lithium batteries have the advantages of high energy density, fast charging and discharging speed, long cycle life, high energy conversion efficiency, good safety, wide operating temperature range, low self-discharge rate and cheap price. It has been widely used in portable electronic equipment, electric tools, electric transportation (including electric vehicles and electric bicyc...

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): H01M4/58H01M10/052C01B33/10
CPCH01M4/5825H01M4/582H01M10/052C01B33/103H01M2004/028C01P2002/72C01P2006/40Y02E60/10
Inventor 孙孝飞程鹏梅雪松李泉省王文君孙铮王海涛
Owner XI AN JIAOTONG UNIV
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
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