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Sea urchin-shaped niobium pentoxide electrode material and preparation method thereof

A technology of niobium pentoxide and electrode materials, which is applied in chemical instruments and methods, inorganic chemistry, niobium compounds, etc., can solve the problems of irregular shape and poor dispersion of sea urchin-like niobium pentoxide microspheres, and achieve excellent electrochemical performance Performance, good dispersibility, uniform and regular shape

Inactive Publication Date: 2017-03-29
NANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the present invention provides a sea urchin-shaped niobium pentoxide electrode material and a preparation method thereof for the existing synthesized sea urchin-shaped niobium pentoxide microspheres with irregular shape and poor dispersion. High efficiency, the sea urchin-like niobium pentoxide electrode material prepared by this method has excellent electrochemical performance when used as the negative electrode of lithium-ion batteries

Method used

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  • Sea urchin-shaped niobium pentoxide electrode material and preparation method thereof
  • Sea urchin-shaped niobium pentoxide electrode material and preparation method thereof
  • Sea urchin-shaped niobium pentoxide electrode material and preparation method thereof

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Embodiment 1

[0033] Step 1), niobium pentachloride was dissolved in deionized water, stirred for 2 hours, wherein the concentration of niobium ions was 0.032mol / L;

[0034] Step 2), hydrofluoric acid is added dropwise to the above solution, wherein the molar ratio of niobium pentachloride to hydrofluoric acid is 1:1, and stirring is continued for 6 hours;

[0035] Step 3), transfer the solution obtained in step 2) to a stainless steel reaction kettle lined with polytetrafluoroethylene, place it in a constant temperature drying oven, and heat and react at 170°C for 24 hours;

[0036] Step 4), the reaction precipitate obtained in step 3) was washed several times with ethanol and deionized water, respectively, until the solution was neutral, and then dried in a vacuum oven at a temperature of 80°C;

[0037] Step 5), the powder obtained in step 4) is placed in a tube furnace, and roasted at 550° C. for 2 hours to obtain the sea urchin-shaped niobium pentoxide.

[0038] like figure 1 As shown...

Embodiment 2

[0040] Step 1), niobium pentachloride was dissolved in deionized water, stirred for 12 hours, wherein the concentration of niobium ions was 0.030mol / L;

[0041] Step 2), hydrofluoric acid is added dropwise to the above solution, wherein the molar ratio of niobium pentachloride to hydrofluoric acid is 1:0.8, and stirring is continued for 15 hours;

[0042] Step 3), the solution obtained in step 2) was transferred to a stainless steel reaction kettle lined with polytetrafluoroethylene, placed in a constant temperature drying oven, and heated and reacted at 165°C for 30 hours;

[0043] Step 4), the reaction precipitate obtained in step 3) was washed several times with ethanol and deionized water, until the solution was neutral, and then dried in a vacuum oven at a temperature of 110°C;

[0044] Step 5), the powder obtained in step 4) is placed in a tube furnace, and roasted at 500° C. for 3 hours to obtain the sea urchin-shaped niobium pentoxide.

Embodiment 3

[0046] Step 1), dissolving ammonium niobium pentachloride in deionized water, stirring for 0.1 hour, wherein the concentration of niobium ions is 0.034mol / L;

[0047] Step 2), adding hydrofluoric acid dropwise to the above solution, wherein the molar ratio of niobium pentachloride to hydrofluoric acid is 1:1.2, and continue stirring for 12 hours;

[0048] Step 3), transfer the solution obtained in step 2) to a stainless steel reaction kettle lined with polytetrafluoroethylene, place it in a constant temperature drying oven, and heat and react at 172°C for 20 hours;

[0049] Step 4), the reaction precipitate obtained in step 3) was washed several times with ethanol and deionized water, respectively, until the solution was neutral, and then dried in a vacuum oven at a temperature of 100°C;

[0050] Step 5), the powder obtained in step 4) is placed in a tube furnace, and roasted at 580° C. for 1.8 hours to obtain the sea urchin-shaped niobium pentoxide.

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Abstract

The invention discloses a preparation method of a sea urchin-shaped niobium pentoxide electrode material. The preparation method comprises the following steps: dissolving niobium pentoxide into deionized water to obtain a liquid; adding hydrofluoric acid in a certain proportion; adding the obtained liquid into a high-pressure reaction kettle, and carrying out heating reaction; and cooling, washing, drying, and roasting so as to obtain the sea urchin-shaped niobium pentoxide electrode material. The invention further discloses the sea urchin-shaped niobium pentoxide electrode material prepared by virtue of the preparation method. A sea urchin-shaped niobium pentoxide microsphere has a uniform and regular shape and relatively good dispersity, is formed by the assembly of one-dimensional nanowires and has the advantages of low-dimensional nano materials, lots of new physical and chemical properties generated through coupling as well as excellent electrochemical performance after being used as the cathode of a lithium ion battery; and by controlling the concentration of niobium chloride, the molar ratio of niobium ions to fluorine ions, the reaction temperature, the reaction time and the like, the shape and size of a product are controlled.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, and in particular relates to a sea urchin-shaped niobium pentoxide electrode material and a preparation method thereof. Background technique [0002] With the enhancement of people's awareness of environmental protection, electric vehicles are more and more widely concerned by people. Lithium-ion batteries are considered to be ideal power sources for electric vehicles due to their high energy density, high operating voltage, small size, long service life, and environmental friendliness. However, the current commercial lithium-ion batteries cannot meet the requirements of electric vehicles on charging speed, cruising range and safety. Therefore, the development of high-performance power lithium-ion batteries has always been the tireless pursuit of people. Electrode materials are the core and key of lithium-ion batteries, and have a decisive impact on the performance of batteries. The...

Claims

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Application Information

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IPC IPC(8): C01G33/00
CPCC01G33/00C01P2002/72C01P2004/03C01P2004/04C01P2004/32C01P2004/61
Inventor 郭佳莉季晓广胡敏吴征刘丹魏铭
Owner NANYANG NORMAL UNIV
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