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A kind of preparation method and application of germanium-carbon-nitrogen nanocomposite material

A technology of nanocomposite materials and carbon-nitrogen nanotubes, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of easy dissolution of germanium oxide, achieve electrochemical interface stability, and reduce production costs. Low, improve the effect of energy density and power density

Inactive Publication Date: 2017-04-12
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] For the above defects or improvement needs of the prior art, the present invention proposes a germanium-carbon-nitrogen nanocomposite material and a preparation method thereof, the purpose of which is to optimize the reaction system of carbon-nitrogen nanotubes, thereby solving the problem of germanium oxide in traditional water solvents. easily soluble problems in

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  • A kind of preparation method and application of germanium-carbon-nitrogen nanocomposite material
  • A kind of preparation method and application of germanium-carbon-nitrogen nanocomposite material
  • A kind of preparation method and application of germanium-carbon-nitrogen nanocomposite material

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preparation example Construction

[0029] In order to achieve the above object, according to one aspect of the present invention, a kind of preparation method of germanium-carbon nitrogen nanocomposite material is provided, it is characterized in that, comprises the following steps:

[0030] (1) Preparation of germanium oxide nanowires

[0031] The following methods are often used to prepare germanium oxide nanowire precursors:

[0032] a. Carbothermal evaporation method: Mix germanium dioxide powder and activated carbon at a mass ratio of 1:2 to 2:1 and grind them thoroughly, then transfer them to a corundum boat with a ceramic cover, and place them in an oxygen flow at 700°C to 950°C Keep warm at ℃ for 2.5h-4h, and collect the germanium oxide nanowires on the ceramic cover.

[0033] b. Co-thermal evaporation method: mix high-purity germanium powder and 6% to 12% iron powder with a quality of germanium powder, hot press at 120°C to 180°C, and press at 750°C under a pressure of 150 to 200 Torr Incubate at ~95...

Embodiment 1

[0046] (1) Grind 2g of germanium oxide and 0.5g of activated carbon with an agate mortar for 5min until uniformly mixed, transfer the mixture to a 100ml hydrothermal kettle, add 12ml of water and 8ml of ethylenediamine to the hydrothermal kettle, and heat Seal the kettle, put it in an oven at 200°C for 96 hours, and wait for the hydrothermal kettle to cool down to room temperature, take out the white suspended matter in the above solution, and wash it three times with distilled water and ethanol. The product was calcined in air at 500°C for 2h in a muffle furnace.

[0047] (2) Take 200 mg of the calcined product and uniformly disperse it in 20 ml of anhydrous methyl acetate, add 20 mg of polyvinyl acetate and 100 mg of anhydrous ferric trichloride, and stir to form a uniform dispersion. Then 20 microliters of pyrrole was added dropwise to the dispersion, and stirred at room temperature for 24 hours. The obtained product was filtered and washed three times, and dried at 50°C f...

Embodiment 2

[0053] (1) Grind 1.5g of germanium dioxide powder and 1.5g of activated carbon fully, then transfer them to a corundum boat with a ceramic cover, keep it warm at 840°C for 3.5h in an oxygen flow of 20 sccm, and collect the germanium oxide precursor on the ceramic cover .

[0054] (2) Take 300 mg of the precursor and disperse it evenly in 20 ml of anhydrous methyl acetate, add 15 mg of polyvinyl acetate and 90 mg of anhydrous ferric chloride, and stir to form a uniform dispersion. Then 15 mg of pyrrole was added dropwise to the dispersion, and stirred at room temperature for 30 h. The obtained product was filtered and washed three times, and dried at 50°C for 5 hours.

[0055] (3) The obtained product was calcined at 650° C. for 4 h in an argon-hydrogen mixed gas containing 4% hydrogen, and the heating rate was 1° C. / min. The germanium-carbon nitrogen nanocomposite electrode material was obtained, and the electrochemical test part was the same as in Example 1, and the prepare...

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Abstract

The invention discloses a germanium-carbon nitrogen nano composite material and a preparation method thereof. Firstly, germanium oxide nano wires are evenly dispersed in liquid-state organic ester, pyrrole, polyvinyl acetate and oxidative metal chlorine salt are added, and full stirring is performed for reaction so as to generate a germanium oxide-carbon nitrogen composite precursor; secondly, calcination is performed at the temperature of 600-1000 DEG C in the reducing atmosphere to obtain the germanium-carbon nitrogen nano composite electrode material; germanium nano particles in the prepared germanium-carbon nitrogen nano composite electrode material are mutually separated at intervals of certain distances and are injected into carbon nitrogen nano tubes in a sectioned mode to form a legume structure. The composite material prepared by means of the preparation method can be applied to lithium ion batteries, pores among discontinuous germanium particles in the material effectively buffer volume change occurred in the germanium charge-discharge process, meanwhile coating of a carbon nitrogen layer facilitates decrease of contact resistance and formation of a stable solid electrolyte interface, the electronic electric conductivity and electrochemical stability of electrodes are improved, and excellent lithium storage performance is shown.

Description

technical field [0001] The invention belongs to the field of preparation method and application of lithium-ion battery electrode materials, and more specifically relates to a preparation method and application of a germanium-carbon-nitrogen nanocomposite material. Background technique [0002] Lithium-ion batteries have attracted extensive attention in electrical energy storage due to their long life and high energy density. With the rise of electric vehicles and mobile electronic devices, people have put forward higher requirements for the energy storage performance of lithium-ion batteries. The performance of lithium-ion batteries depends on the electrode materials. Commercial lithium-ion cathode materials are developing rapidly. From lithium cobalt oxide, lithium iron phosphate to ternary materials, the performance and safety are getting better and better, while commercial anode materials are mainly carbon materials. The specific capacity is low (theoretical specific cap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/139H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/139H01M4/362H01M10/0525Y02E60/10
Inventor 霍开富王蕾彭长健
Owner HUAZHONG UNIV OF SCI & TECH
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