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Spherical titanium niobate electrode material and preparation method thereof

An electrode material, titanium niobate technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as low battery energy density, and achieve uniform size, easy industrial production, and high reversible capacity.

Inactive Publication Date: 2016-10-12
NANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its low theoretical specific capacity (175mAh / g) limits the improvement of battery energy density, so it is urgent to find new negative electrode materials.

Method used

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  • Spherical titanium niobate electrode material and preparation method thereof
  • Spherical titanium niobate electrode material and preparation method thereof
  • Spherical titanium niobate electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Dissolve niobium ethoxide and butyl titanate in a certain amount of isopropanol respectively, and then mix to obtain a mixed solution, wherein the concentration of niobium in the mixed solution is 0.8mol / L, niobium atom:titanium atom=1.8:1 , niobium ethoxide is a kind of niobium source, and butyl titanate is a kind of titanium source;

[0029] 2) Put the solution obtained in step 1) into a reaction kettle, heat the reaction at 158° C. in a constant temperature drying oven, and then naturally cool to room temperature to obtain a precipitate;

[0030] 3) The obtained precipitate was washed several times with deionized water and ethanol, and then vacuum-dried at 50°C to obtain a powder;

[0031] 4) Calcining the powder obtained in step 3) at 1200° C. in a tube furnace to obtain a spherical titanium niobate electrode material.

[0032] The XRD figure of the spherical titanium niobate electrode material prepared by embodiment 1 is as follows figure 1 As shown, the diffr...

Embodiment 2

[0035] 1) Niobium ethoxide and titanium tetrachloride are respectively dissolved in a certain amount of ethylene glycol, and then mixed to obtain a mixed solution, wherein the concentration of niobium in the mixed solution is 3.1mol / L, niobium atom:titanium atom=2.3:1 , niobium ethoxide is a kind of niobium source, and titanium tetrachloride is a kind of titanium source;

[0036] 2) Put the solution obtained in step 1) into a reaction kettle, heat the reaction at 240° C. in a constant temperature drying oven, and then naturally cool to room temperature to obtain a precipitate;

[0037] 3) Naturally cool to room temperature, wash the obtained precipitate several times with deionized water and ethanol, and then vacuum dry at 79°C in a vacuum drying machine to obtain a powder;

[0038] 4) Calcining the powder obtained in step 3) at 760° C. in a tube furnace to obtain a spherical titanium niobate electrode material.

Embodiment 3

[0040] 1) Niobium pentachloride and titanium tetrachloride are respectively dissolved in a certain amount of acetic acid, and then mixed to obtain a mixed solution, wherein the concentration of niobium in the mixed solution is 0.02mol / L, niobium atom:titanium atom=2.15:1 , niobium pentachloride is a kind of niobium source, and titanium tetrachloride is a kind of titanium source;

[0041] 2) Put the solution obtained in step 1) into a reaction kettle, heat the reaction at 70° C. in a constant temperature drying oven, and then naturally cool to room temperature to obtain a precipitate;

[0042] 3) Naturally cool to room temperature, wash the obtained precipitate with deionized water and ethanol several times, and then vacuum dry at 98°C in a vacuum drying machine to obtain a powder;

[0043] 4) Calcining the powder obtained in step 3) at 920° C. in a tube furnace to obtain a spherical titanium niobate electrode material.

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Abstract

The invention discloses a preparation method of a spherical titanium niobate electrode material. The preparation method comprises the following steps that a niobium source and a titanium source are dissolved in a certain amount of organic solvent, and mixing is carried out to obtain a mixed solution, wherein the concentration of niobium in the mixed solution ranges from 0.02 mol / L to 7.8 mol / L, and the ratio of niobium atoms to titanium atoms is 1.6:1 to 2.5:1; the obtained solution is contained in a reaction still, heating and reacting are carried out in a constant-temperature drying box at preset heating temperature, then natural cooling is carried out to reach room temperature, and sediment is obtained; the obtained sediment is washed with deionized water and ethyl alcohol many times, and vacuum drying is carried out at preset drying temperature to obtain powder; the obtained powder is calcined at preset calcining temperature, and the spherical titanium niobate electrode material is obtained. The invention further discloses the spherical titanium niobate electrode material.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and in particular relates to a spherical titanium niobate electrode material and a preparation method thereof. Background technique [0002] Electric vehicles are the development direction of future automobiles, and secondary battery technology is considered to be the key to the development of the electric vehicle industry. Among them, lithium-ion batteries have been widely used in various electronic products since their commercialization in 1991 due to their high energy density, wide operating temperature range, long service life, and environmental friendliness, and are considered ideal for electric vehicles. power source. At present, graphite negative electrodes occupy a dominant position in lithium-ion batteries, but graphite negative electrodes can easily lead to the generation and dissolution of lithium dendrites and solid electrolyte oxide films, which cause some problems ...

Claims

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Application Information

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IPC IPC(8): H01M4/62
CPCH01M4/62Y02E60/10
Inventor 刘光印魏铭刘小娣李政道赵强柳文敏谢海泉郭佳莉季晓广
Owner NANYANG NORMAL UNIV
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