Lithium iron phosphate precursor/carbon nanotube composite material

A carbon nanotube composite and lithium iron phosphate technology, which is applied in nanotechnology, phosphorus compounds, nanotechnology, etc., can solve problems such as uneven composition

Active Publication Date: 2020-10-02
CENT SOUTH UNIV
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  • 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

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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...

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Abstract

The invention provides a lithium iron phosphate precursor/carbon nanotube composite material which is characterized in that a lithium iron phosphate precursor is metal phosphate A or metal oxide B andhas a submicron or micron structure, wherein the precursor material is uniformly distributed in a conductive network formed by carbon nanotubes, the content of the carbon nanotubes is 0.1-20 wt%, andthe content of the precursor is 80-99.9 wt%; the composite precursor material only needs to be uniformly mixed with a certain amount of lithium salt, and the lithium iron phosphate/carbon nanotube composite cathode material is obtained after a simple high-temperature solid-phase reaction. According to the invention, the iron-based catalyst is used for preparing the carbon nanotube; the iron-basedcatalyst is used as all or part of sources of metal elements in the lithium iron phosphate precursor, so that the preparation cost is reduced, the intrinsic conductivity and lithium ion diffusion coefficient of the lithium iron phosphate material are improved, the conductivity of the material is improved in combination with a conductive network constructed by the carbon nanotubes, and the comprehensive electrochemical performance of the lithium iron phosphate material is remarkably improved.

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

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Application Information

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Patent Type & Authority Applications(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
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