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Ferric fluoride/conducting polymer composite material, preparation method thereof and lithium secondary battery

A technology of conductive polymer and conductive polymer layer, used in secondary batteries, battery electrodes, circuits, etc., can solve the problems of low electronic conductivity and volume expansion of iron trifluoride

Inactive Publication Date: 2016-09-28
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Even so, iron trifluoride as a positive electrode material still has the problems of low electronic conductivity and volume expansion due to polarization during charge and discharge.

Method used

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  • Ferric fluoride/conducting polymer composite material, preparation method thereof and lithium secondary battery
  • Ferric fluoride/conducting polymer composite material, preparation method thereof and lithium secondary battery
  • Ferric fluoride/conducting polymer composite material, preparation method thereof and lithium secondary battery

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preparation example Construction

[0051] The present invention also provides a preparation method of ferric fluoride / conductive polymer composite material, comprising the following steps:

[0052] A) After mixing and reacting ferric fluoride powder, ferric chloride solution, conductive polymer monomer, anionic surfactant and organic solvent, ferric fluoride / conductive polymer composite material is obtained.

[0053] The selection, source and ratio of the raw materials in the present invention are consistent with those in the aforementioned ferric fluoride / conductive polymer composite material unless otherwise specified, and will not be repeated here.

[0054] The present invention has no special restrictions on the specific selection of the ferric chloride solution, and those skilled in the art can select according to actual production conditions, composite conditions and product performance. The ferric chloride solution of the present invention is preferably acid trichloride iron solution. The concentration ...

Embodiment 1

[0070] First configure the iron source FeCl with a concentration of 0.35M 3 solution with a concentration of 1.2M fluorine source NH 4 F solution, then add a small amount of lauryltrimethylammonium bromide (DTAB) powder in the polytetrafluoroethylene reactor (PTFE) equipped with iron source, and put PTFE in the DF-101S type with a rotating speed of 200r / min at the same time Stir on a magnetic stirrer at constant temperature for 2 hours; then add the fluorine source dropwise to the PTFE under stirring at a molar ratio of 4:1 to the iron source, and seal the reaction for 4 hours at room temperature; put the reaction kettle into the stirrer, Stir at 300r / min and react in an oil bath at 70°C for 22 hours to obtain a precipitate containing crystal water; wash the precipitate with absolute ethanol for 3 times, then transfer it to a 75°C drying oven with Ar for drying After cooling to room temperature for 12 hours, put it into an Ar-protected tube atmosphere furnace and dry it at 30...

Embodiment 2

[0077] First configure the iron source FeCl with a concentration of 0.5M 3 solution with a concentration of 1.5M fluorine source NH 4 F solution, then add a small amount of lauryltrimethylammonium bromide (DTAB) powder in the polytetrafluoroethylene reactor (PTFE) equipped with iron source, and put PTFE in the DF-101S type with a rotating speed of 200r / min at the same time Stir on a magnetic stirrer at constant temperature for 2 hours; then add the fluorine source dropwise to the PTFE under stirring at a molar ratio of 3.5:1 to the iron source, and seal the reaction for 3 hours at room temperature; put the reaction kettle into the stirrer, Stir at 300r / min and react in an oil bath at 75°C for 24 hours to obtain a precipitate containing crystal water; wash the precipitate with absolute ethanol for 3 times, then transfer it to a 65°C drying oven with Ar for drying After cooling to room temperature for 13 hours, put it into an Ar-protected tube atmosphere furnace and dry it at 4...

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Abstract

The invention provides a ferric fluoride / conducting polymer composite material. The ferric fluoride / conducting polymer composite material comprises ferric fluoride and a conducting polymer compounded to the surface of ferric fluoride. The invention further provides a preparation method of the ferric fluoride / conducting polymer composite material. The preparation method comprises the step of mixing ferric fluoride powder, a ferric trichloride solution, conducting polymer monomers, an anionic surfactant and an organic solvent to react, so as to obtain the ferric fluoride / conducting polymer composite material. Aiming at the problems that ferric trichloride has over-low electronic conductivity and expands along the polarization in charging and discharging processes, ferric trifluoride nanoparticles are coated with the conducting polymer by virtue of in situ polymerization and compounding, so that the polarization phenomenon of a ferric trifluoride material in the charging and discharging processes can be effectively overcome, the stability and capacity of the cathode material can be enhanced, meanwhile, the problem that the conductivity of a ferric trifluoride cathode material is too low can be well solved, and therefore, the electrochemical performance of the ferric trifluoride cathode material is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a ferric fluoride / conductive polymer composite material, a preparation method thereof, and a lithium ion battery. Background technique [0002] With the continuous progress of human society, people's demand for various energy sources has also greatly increased, so the development trend of various emerging energy sources is also unstoppable, and lithium secondary batteries are one of them. The rapid development of small electronic products, electric transportation equipment, reserve power, aerospace and other fields are closely related to the development of lithium secondary batteries. At this stage, there is an urgent need for higher power, longer life, higher energy density, higher capacity, A breakthrough has been made in green and environmentally friendly lithium secondary batteries. [0003] The competition in the lithium-ion battery industry is becoming increa...

Claims

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Application Information

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IPC IPC(8): H01M4/137H01M4/1399H01M10/0525
CPCH01M4/137H01M4/1399H01M10/0525Y02E60/10
Inventor 李军许帅军黄思李少芳潘春阳
Owner GUANGDONG UNIV OF TECH
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