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

A kind of lithium iron phosphate precursor/carbon nanotube composite material

A technology of lithium iron phosphate and carbon nanotubes, applied in the direction of nanotechnology, phosphorus compounds, carbon compounds, etc., can solve problems such as uneven composition, achieve good dispersion, achieve in-situ growth, and reduce the effect of separation processes

Active Publication Date: 2021-11-16
CENT SOUTH UNIV
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Improve the problem of carbon nanotube agglomeration and uneven composition in composite cathode materials

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 30g of iron powder (with a median particle size of 1.36um) as a catalyst, put the catalyst into the reaction furnace of the chemical vapor deposition device, assemble the experimental device and check the air tightness. Argon gas was introduced into the reaction furnace to exhaust the air, and the gas flow rate was 700 sccm. Raise the reaction furnace to 780° C. at a rate of 5° C. / min, stop feeding argon, start feeding methane, and the gas flow rate is 200 sccm. After reacting for 45 minutes, the heating was stopped, and the catalyst / carbon nanotube composite material was obtained after cooling with the furnace. After component analysis, it was determined that the content of iron in the catalyst / carbon nanotube composite material was 84.53wt%. Weigh 15 g of catalyst / carbon nanotube composite material, 400 ml of 2 mol / l sulfuric acid solution, mix them and carry out mechanical stirring. After reacting for 3 hours, add excess hydrogen peroxide to the mixed slurry ...

Embodiment 2

[0022] Weigh 30g of iron-based catalyst (median particle size is 0.85um, iron content is 96wt%, manganese content is 4wt%) as catalyst, put the catalyst into the reaction furnace of chemical vapor deposition device, assemble the experimental device and check the air tightness sex. Argon gas was introduced into the reaction furnace to exhaust the air, and the gas flow rate was 1000 sccm. Raise the reaction furnace to 850°C at a rate of 5°C / min, stop feeding argon, start feeding acetylene, and the gas flow rate is 300 sccm. After reacting for 45 minutes, the heating was stopped, and the catalyst / carbon nanotube composite material was obtained after cooling with the furnace. After component analysis, it was determined that the content of iron in the catalyst / carbon nanotube composite material was 87.59wt%. Weigh 15 g of catalyst / carbon nanotube composite material, 400 ml of 2 mol / l sulfuric acid solution, mix them and carry out mechanical stirring. After reacting for 3 hours, ...

Embodiment 3

[0025] Weigh 30g of iron powder (with a median particle size of 4.25um) as a catalyst, put the catalyst into the reaction furnace of the chemical vapor deposition device, assemble the experimental device and check the air tightness. Argon gas was introduced into the reaction furnace to exhaust the air, and the gas flow rate was 700 sccm. Raise the reaction furnace to 950° C. at a rate of 5° C. / min, stop feeding argon, start feeding natural gas, and the gas flow rate is 500 sccm. After reacting for 45 minutes, the heating was stopped, and the catalyst / carbon nanotube composite material was obtained after cooling with the furnace. After component analysis, it was determined that the content of iron in the catalyst / carbon nanotube composite material was 89.63wt%. Take 500ml of 2mol / l sulfuric acid solution and 15g of catalyst / carbon nanotube composite material, put them into the autoclave and seal them. Slowly feed oxygen into the kettle and start stirring, control the oxygen p...

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
particle sizeaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides a lithium iron phosphate precursor / carbon nanotube composite material, which is characterized in that the lithium iron phosphate precursor is metal phosphate A or metal oxide B, and has a submicron or micron structure; the precursor material is evenly distributed In the conductive network composed of carbon nanotubes, the content of carbon nanotubes is 0.1-20wt%, and the content of precursors is 80-99.9wt%. The composite precursor material only needs to be uniformly mixed with a certain amount of lithium salt. A lithium iron phosphate / carbon nanotube composite positive electrode material is obtained after a simple high-temperature solid-state reaction. The invention utilizes an iron-based catalyst to prepare carbon nanotubes, and the iron-based catalyst is used as all or part of the source of metal elements in the lithium iron phosphate precursor, which reduces the preparation cost and improves the intrinsic conductivity and lithium ion diffusion of the lithium iron phosphate material Coefficient, combined with the conductive network constructed by carbon nanotubes to improve the conductivity of the material, significantly improve the comprehensive electrochemical performance of lithium iron phosphate materials.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a lithium iron phosphate precursor / carbon nanotube composite material. Background technique [0002] With the rapid development of society, the consumption of traditional fossil energy is increasing day by day, and the ensuing pollution problem has also seriously affected the living environment of human beings. In order to realize the sustainable development of human society, renewable energy sources such as solar energy, water energy, and wind energy have attracted more and more attention. However, none of these energy sources can generate electricity continuously and stably, and it is difficult to directly integrate it into the power grid system, requiring suitable devices to store it. Lithium-ion batteries have the characteristics of high working potential, high energy density, no memory effect, and environmental friendliness. They have been widely used in portabl...

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 Patents(China)
IPC IPC(8): C01B25/45C01B32/162H01M4/58H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B25/45C01P2004/61C01P2004/62C01P2004/64C01P2004/80C01P2006/40C01B32/162H01M4/5825H01M4/625H01M4/626H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 颜果春王接喜李新海席昭王志兴郭华军胡启阳彭文杰
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