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Bismuth germanate two-dimension nanosheet and preparing method thereof

A two-dimensional nano, bismuth germanate technology, applied in nanotechnology, chemical instruments and methods, bismuth compounds, etc., can solve the problems of low graphite capacity and achieve the effect of high charge and discharge capacity and good cycle performance

Active Publication Date: 2019-04-02
SHANGQIU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem of low graphite capacity of negative electrode materials for lithium-ion batteries in the prior art, the present invention provides a two-dimensional bismuth germanate nanosheet and its preparation method

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  • Bismuth germanate two-dimension nanosheet and preparing method thereof
  • Bismuth germanate two-dimension nanosheet and preparing method thereof
  • Bismuth germanate two-dimension nanosheet and preparing method thereof

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Embodiment 1

[0024] A bismuth germanate two-dimensional nanosheet, the shape of the bismuth germanate is a two-dimensional nanosheet structure, and its thickness is 3 to 50 nm. Its diameter is approximately 200-500 nm, and the diameter here does not only refer to the size when the two-dimensional nanosheet structure is circular, but also refers to the approximate size when it is non-circular, which are well known to those skilled in the art .

[0025] The two-dimensional bismuth germanate nanosheet is prepared by a solvothermal method using bismuth triiodide and germanium dioxide as raw materials, a mixture of ethylene glycol and water as a solvent, and nickel foam as a substrate.

[0026] The ratio of the amount of bismuth triiodide and germanium dioxide is (0.3~2): 1, the total amount of bismuth triiodide and germanium dioxide added is 1~4 mmol, and the amount of ethylene glycol is 5 ~ 25 mL, the amount of water used is 5 ~ 25 mL.

[0027] The present invention also provides a method f...

Embodiment 2

[0040] A bismuth germanate two-dimensional nanosheet, the shape of the bismuth germanate is a two-dimensional nanosheet structure, and the thickness of the sheet structure is 30nm. The diameter of the sheet is 200 ~ 300 nm.

[0041] The two-dimensional bismuth germanate nanosheet is prepared by a solvothermal method using bismuth triiodide and germanium dioxide as raw materials, a mixture of ethylene glycol and water as a solvent, and nickel foam as a substrate.

[0042] The ratio of the amount of substance of described bismuth triiodide and germanium dioxide is 1:1, the total addition amount of bismuth triiodide and germanium dioxide is 1.5mmol, the consumption of ethylene glycol is 10 mL, and the consumption of water is 20 mL.

[0043] The preparation method of the above-mentioned two-dimensional bismuth germanate nanosheets consists of the following steps:

[0044] (1) First, dissolve 1.5 mmol of bismuth triiodide and germanium dioxide in a mixed solution of 10 mL of ethy...

Embodiment 3

[0053] The difference with embodiment 2 is:

[0054] The present embodiment bismuth germanate Bi 4 Ge 3 o 12 The preparation method of two-dimensional nanosheets consists of the following steps:

[0055] (1) First, dissolve 1 mmol of bismuth triiodide and germanium dioxide in a mixed solution of 20 mL of ethylene glycol and 10 mL of water, and obtain a mixed solution after magnetic stirring for 2 hours; the amount of bismuth triiodide and germanium dioxide The ratio is 1.3:1;

[0056] (2) Add the above mixture to 1 mL of N,N'-diisopropylcarbodiimide dropwise, and keep stirring for 3 hours to obtain a solution;

[0057] (3) Put the solution in step (2) into a hydrothermal reaction kettle for hydrothermal reaction. A piece of nickel foam substrate is placed inside the hydrothermal reaction kettle. The hydrothermal reaction time is 18 hours and the temperature is 210 ℃; The capacity of the hydrothermal reaction kettle is 50ml, and other capacities are also available;

[005...

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Abstract

The invention discloses a bismuth germanate two-dimension nanosheet and a preparing method thereof. The bismuth germanate has a two-dimension nanosheet morphology structure, with the thickness of a sheet layer being 3-50 nm and the diameter of the sheet layer being 200-500 nm. The nanosheet is prepared from bismuth triiodide and germanium dioxide, by adopting ethylene glycol-water mixture liquid as a solvent, adopting foamed nickel as a substrate and by utilizing a solvothermal process. The mole ratio of the bismuth triiodide to the germanium dioxide is (0.3-2):1, the total amount of the addedbismuth triiodide and germanium dioxide is 1-4 mmol, the amount of the ethylene glycol is 5-25 mL, and the amount of the water is 5-25 mL. When the nanosheet is used for a lithium ion battery negative electrode material, the reversible capacity in the first cycle of the material under a current density of 100 mA / g can be 1200-1469 mAh / g, the capacity retention ratio after 100 cycles is 50-65%, and the electrode material has high charging-discharging capacity and shows good cyclic performance.

Description

technical field [0001] The invention belongs to the technical field of inorganic energy storage materials, and in particular relates to a two-dimensional bismuth germanate nanosheet and a preparation method thereof. Background technique [0002] In the 21st century, with the excessive consumption of fossil fuels and the deterioration of the natural environment, lithium-ion batteries with many advantages such as high energy density, long cycle life, no memory effect, and environmental friendliness are considered to be a very competitive Chemical energy storage and conversion devices. However, in order to promote them to electric vehicles, hybrid vehicles and power stations, people still need to work hard to improve their performance, because these large electrical equipment require very strict conditions, such as extremely high capacity, power density and safety performance. For lithium-ion batteries, the electrode material is a key factor in determining its performance. At...

Claims

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Application Information

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IPC IPC(8): C01G29/00H01M4/58H01M10/0525B82Y40/00
CPCB82Y40/00C01G29/00C01P2002/72C01P2004/03C01P2004/20C01P2006/40H01M4/5825H01M10/0525Y02E60/10
Inventor 魏伟贾方方付坤王科峰张春雨王军梅
Owner SHANGQIU NORMAL UNIVERSITY
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