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Preparation method of niobium pentoxide/reduced graphene oxide composite negative electrode material

A graphene composite and niobium pentoxide technology, which is applied in nanotechnology for materials and surface science, battery electrodes, secondary batteries, etc., can solve problems such as long time required, high energy consumption, and serious agglomeration. Achieve the effect of low cost, low energy consumption and simple process

Pending Publication Date: 2019-10-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the Nb2O5 powder material has large particles, which are micron-sized, and the agglomeration is serious, which cannot effectively solve the problem of capacity fading due to poor structural stability of Nb2O5 negative electrode materials during charge and discharge.
There are gaps between the Nb2O5 micron particles synthesized by this method, which is not conducive to the electronic conduction process of the material, and cannot maximize the effect of graphene on the conductivity of the Nb2O5 negative electrode material.
Part of the synthetic process in this method requires high temperature, long time and high energy consumption.

Method used

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  • Preparation method of niobium pentoxide/reduced graphene oxide composite negative electrode material
  • Preparation method of niobium pentoxide/reduced graphene oxide composite negative electrode material
  • Preparation method of niobium pentoxide/reduced graphene oxide composite negative electrode material

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Experimental program
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Effect test

Embodiment 1

[0030] This embodiment includes the following steps:

[0031] (1) Mix 0.0435 g graphene oxide nanosheets with 40 ml deionized water, stir for 0.5 h, and ultrasonically disperse for 0.5 h to obtain a graphene oxide nano-dispersion;

[0032] (2) Disperse 0.872 g of niobium pentachloride in 40 mL of deionized water and stir for 0.5 h to obtain a suspension of niobium pentachloride; add 2 g of oxalic acid to the suspension obtained above and stir for 0.5 h to obtain a clear solution; 1.12 g of hexamethylenetetramine was added to the above clear solution and stirred for 0.5 h to obtain a white solution;

[0033] (3) Mix the white solution obtained in step (2) with the graphene oxide nano-dispersion obtained in step (1), stir for 0.5 h to obtain a mixed solution, put the mixed solution in a high-pressure reactor, and conduct 14 The hydrothermal reaction of h;

[0034] (4) After the completion of the hydrothermal reaction, the obtained precipitate was centrifuged and washed three t...

Embodiment 2

[0040] This embodiment includes the following steps:

[0041] (1) Mix 0.0435 g graphene oxide nanosheets with 40 mL deionized water, stir for 0.5 h, and ultrasonically disperse for 0.5 h to obtain graphene oxide nanodispersion;

[0042] (2) Disperse 0.872 g of niobium pentachloride in 40 mL of deionized water and stir for 0.5 h to obtain a suspension of niobium pentachloride; add 2 g of oxalic acid to the suspension obtained above and stir for 0.5 h to obtain a clear solution; 1.12 g of hexamethylenetetramine was added to the above clear solution and stirred for 0.5 h to obtain a white solution;

[0043] (3) Mix the white solution obtained in step (2) with the graphene oxide nano-dispersion obtained in step (1), stir for 0.5 h to obtain a mixed solution, put the mixed solution in a high-pressure reactor, and conduct 8 The hydrothermal reaction of h;

[0044] (4) After the completion of the hydrothermal reaction, the precipitate obtained from the hydrothermal reaction was cen...

Embodiment 3

[0049] This embodiment includes the following steps:

[0050] (1) Mix 0.0435 g of graphene oxide nanosheets with 40 ml of deionized water, stir for 0.5 h, and ultrasonically disperse for 0.5 h to obtain a graphene oxide nanodispersion;

[0051] (2) Disperse 0.872 g of niobium pentachloride in 40 ml of deionized water and stir for 0.5 h to obtain a suspension of niobium pentachloride; add 2 g of oxalic acid to the suspension obtained above and stir for 0.5 h to obtain a clear solution; 1.12 g of hexamethylenetetramine was added to the above clear solution and stirred for 0.5 h to obtain a white solution;

[0052] (3) The above white solution was mixed with the graphene oxide nano-dispersion, and stirred for 0.5 h to obtain a mixed solution. The mixed solution was put into an autoclave, and a hydrothermal reaction was carried out at 180 °C for 24 h.

[0053] (4) After the completion of the hydrothermal reaction, the precipitate obtained from the hydrothermal reaction was centr...

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Abstract

The invention discloses a preparation method of a niobium pentoxide / reduced graphene oxide composite negative electrode material. The preparation method comprises the following steps of (1) mixing graphene oxide nanosheets with water and carrying out stirring and ultrasonic dispersing to obtain graphene oxide nano-dispersion; (2) dissolving niobium pentachloride into water and stirring to obtain niobium pentachloride suspension, sequentially adding an organic cosolvent and hexamethyleneteramine into the niobium pentachloride suspension and stirring to obtain a white solution; (3) mixing the graphene oxide nano-dispersion with the white solution, stirring until uniform dispersion to obtain a mixed solution, putting the obtained mixed solution into a high pressure reactor to carry out hydrothermal reaction; (4) after hydrothermal reaction is completed, washing and drying the obtained sediments to obtain solid powder; and (5) carrying out thermal treatment on the solid powder in argon atmosphere. The preparation method is convenient to operate and controllable in reaction conditions; and a lithium battery provided with a negative electrode prepared from the obtained composite negativeelectrode material has excellent cycle performance and rate capability.

Description

technical field [0001] The invention relates to a preparation method of a lithium-ion rechargeable battery composite negative electrode material, in particular to a preparation method of a niobium oxide negative electrode material composed of niobium pentoxide / reduced graphene oxide. Background technique [0002] Lithium-ion rechargeable batteries are commonly used as energy storage devices. Compared with lead-acid batteries and nickel-cadmium batteries, they have the characteristics of higher voltage, high energy density, long service life, environmental friendliness and no memory effect. Since Since its commercialization, it has played a pivotal role and has been widely used in mobile electronic devices, communication equipment and backup power supplies. [0003] With the rapid development of electric vehicles and hybrid vehicles, lithium-ion batteries are considered to be ideal candidates for the power system of electric vehicles due to their unique advantages. High powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62B82Y30/00H01M10/0525
CPCB82Y30/00H01M4/362H01M4/483H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 喻万景戴琼雨王杰安添辉易旭童汇张宝彭文杰
Owner CENT SOUTH UNIV
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