Method for preparing hexa-fluorine lithium ferrite and carbon nano-tube composite materials

A technology of lithium hexafluoroferrate and carbon nanotubes, which can be used in electrical components, electrochemical generators, battery electrodes, etc., and can solve the problems of poor conductivity of lithium hexafluoroferrate.

Inactive Publication Date: 2016-10-12
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0005] In order to solve the problem of poor electrical conductivity of lithium hexafluoroferrite, the present invention provides a preparation method of lithium hexafluoroferrite and carbon nanotube composite material; The excellent electronic conductivity characteristics of the tube can prepare composite materials with better conductivity, which can be used as positive electrode materials for lithium-ion batteries

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  • Method for preparing hexa-fluorine lithium ferrite and carbon nano-tube composite materials
  • Method for preparing hexa-fluorine lithium ferrite and carbon nano-tube composite materials
  • Method for preparing hexa-fluorine lithium ferrite and carbon nano-tube composite materials

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preparation example Construction

[0016] Preparation method of lithium hexafluoroferrate and carbon nanotube composite material:

[0017] ①Dissolve 20 grams of ferric nitrate nonahydrate in 200 ml of deionized water, use 5 mg of cetyltrimethylammonium bromide as a surfactant, and keep stirring for 3 hours to form ferric nitrate-cetyltrimethylammonium bromide Saturated solution of methyl ammonium bromide;

[0018] ② Add 0.1 g of carbon nanotubes to 20 ml of 1 mol / L sodium hydroxide solution and stir for 3 hours, wash with deionized water until neutral, and centrifugally filter;

[0019] ③ Add the carbon nanotubes treated in step ② into 20 ml of 40% hydrofluoric acid solution, and continue stirring for 3 hours to obtain a relatively uniformly dispersed carbon nanotube-hydrofluoric acid solution;

[0020] ④Add 20 milliliters of carbon nanotube-hydrofluoric acid solution obtained in step ③ and 5.6 grams of lithium carbonate powder to 200 milliliters of ferric nitrate-hexadecyltrimethylammonium bromide solution ob...

Embodiment 1

[0023] One: Comparative experiments of lithium hexafluoroferrate and carbon nanocomposite materials, lithium hexafluoroferrate and graphite carbon black nanocomposites, and lithium hexafluoroferrate:

[0024] 1. The preparation method of lithium hexafluoroferrate:

[0025] 1) Dissolve 20 grams of ferric nitrate nonahydrate in deionized water, use 5 mg of cetyltrimethylammonium bromide as a surfactant, and continue stirring for 3 hours to form ferric nitrate-cetyltrimethylammonium ammonium bromide saturated solution;

[0026] 2) Add 20 ml of 40% hydrofluoric acid solution and 5.6 g of lithium carbonate powder to the ferric nitrate-hexadecyltrimethylammonium bromide saturated solution obtained in step 1), and continue stirring for 3 hours. white precipitate;

[0027] 3) Wash the white precipitate obtained in step 2) with isopropanol for 5 times, and then put it in an air-blast drying oven at 80°C for 10 hours to obtain a lithium hexafluoroferrate sample.

[0028] 2. Preparati...

Embodiment 2

[0033] 1: Lithium hexafluoroferrite and carbon nanotube composite material and lithium hexafluoroferrate and graphite carbon black nanocomposite for electrode comparison experiment:

[0034] 1. Mix 0.8 grams of lithium hexafluoroferrate with graphite carbon black nanocomposites and 0.2 grams of polyvinylidene fluoride, then add 8 milliliters of N-methyl-2-pyrrolidone, and ball mill for 1 hour to obtain experimental Slurry of lithium hexafluoroferrate and graphite carbon black nanocomposite.

[0035] 2. Mix 0.8 g of lithium hexafluoroferrate with carbon nanotube composite material and 0.2 g of polyvinylidene fluoride, then add 8 ml of N-methyl-2-pyrrolidone, and ball mill for 1 hour to obtain the experimental Slurry of lithium hexafluoroferrate / carbon nanotube composite.

[0036] 3. Use aluminum foil as the current collector; first punch the aluminum foil into a small disc with a diameter of 1 cm and a piece with a width of 1.5 × 5 cm. After removing the burr, clean it with ac...

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Abstract

The invention discloses a method for preparing a xa-fluorine lithium ferrite and carbon nano-tube composite material. The method includes dissolving 20 grams of iron nitrate nonahydrate in 200 milliliters of deionized water, adding 5 milligrams of cetyl trimethyl ammonium bromide into the deionized water and continuously stirring the cetyl trimethyl ammonium bromide in the deionized water for 3 hours to obtain saturated solution; adding 0.1 gram of carbon nano-tubes into 20 milliliters of 1 mole/liter sodium hydroxide solution, stirring the carbon nano-tubes in the sodium hydroxide solution, cleaning the carbon-tubes by the aid of deionized water until the carbon nano-tubes is neutral and carrying out centrifugal suction filtration on the carbon nano-tubes; adding the treated carbon nano-tubes into 20 milliliters of 40% hydrofluoric acid solution, stirring the carbon nano-tubes in the hydrofluoric acid solution to obtain uniformly dispersed carbon nano-tube-hydrofluoric acid solution; adding the obtained carbon nano-tube-hydrofluoric acid solution and 5.6 grams of lithium carbonate powder into iron nitrate-cetyl trimethyl ammonium bromide solution and continuously stirring the obtained carbon nano-tube-hydrofluoric acid solution and the lithium carbonate powder in the iron nitrate-cetyl trimethyl ammonium bromide solution to obtain black precipitates; cleaning and centrifuging the obtained black precipitates by the aid of isopropyl alcohol by four times and then drying the black precipitates in an air blast drying oven at the temperature of 80 DEG C for 10 hours to obtain the hexa-fluorine lithium ferrite and carbon nano-tube composite material. The method has the advantage that the hexa-fluorine lithium ferrite and carbon nano-tube composite material is excellent in electric conductivity and can be used as an anode material for lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials and lithium ion battery electrode materials, and relates to a preparation method of positive electrode materials, in particular to a preparation method of lithium hexafluoroferrate and carbon nanotube composite materials. . Background technique [0002] In recent years, the rapid development of electric tools, electric bicycles, especially electric vehicles and other fields has provided good application prospects for lithium-ion batteries, but at the same time, the cycle life, energy density, safety, price and environmental protection of lithium-ion batteries have been greatly affected. Capacitance and other performance put forward higher requirements. [0003] At present, some breakthroughs have been made in the research of binary iron fluoride (mainly iron trifluoride) as the positive electrode of lithium-ion batteries. It can achieve 2-3 times the capacity performance of tradit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/583H01M4/62H01M10/0525C01B31/02
CPCH01M4/525H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 史月丽孙淑彬刘静静庄全超崔永莉鞠治成
Owner CHINA UNIV OF MINING & TECH
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