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Method for preparing vanadium sodium phosphate and vanadium phosphate serving as anode material of sodium ion battery

A technology of sodium vanadium phosphate, positive electrode material, applied in battery electrodes, circuits, electrical components and other directions, can solve the problems of cumbersome steps, unfavorable industrial production, complicated operation, etc., and achieves simple process flow, easy industrial production, and shortened process steps. Effect

Inactive Publication Date: 2017-02-15
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

What these methods have in common is that they all need to reduce the toxic pentavalent vanadium source compound, and there are cumbersome steps and complicated operations, which are not conducive to industrial production.

Method used

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Examples

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preparation example Construction

[0019] Preparation vanadium phosphate (VPO) of the present invention 4 ) method includes the following steps:

[0020] The trivalent vanadium source compound is reacted with a base to obtain vanadium hydroxide. Wherein, the trivalent vanadium source compound can be vanadium sulfate (V 2 (SO 4 ) 3 ), vanadium chloride (V 3 Cl 2 ) in one or a combination of two. The alkali used can be one or more combinations of sodium hydroxide, potassium hydroxide, calcium hydroxide, and ammonia. The addition of alkali only needs to make the pH value of the aqueous solution of vanadium sulfate or vanadium chloride be 4-10 to produce vanadium hydroxide precipitation. Precipitated vanadium hydroxide can also be collected. Precipitated vanadium hydroxide can be collected by filtration or centrifugation. The collected vanadium hydroxide can also be washed. Vanadium hydroxide can be washed with water or one or a combination of two or more organic solvents such as methanol, ethanol, aceton...

Embodiment 1

[0028] Weigh 0.05mol (19.5g) vanadium sulfate (V 2 (SO 4 ) 3 ), was added into 100mL deionized water, and ultrasonically dissolved to obtain solution A containing trivalent vanadium ions.

[0029] The pH value of solution A was adjusted to 7 with sodium hydroxide solution (concentration: 10 wt%), and a large amount of precipitate B was produced in solution A.

[0030] Precipitate B was filtered and washed, dissolved in 100 mL of phosphoric acid solution, and refluxed at 100°C for 6 hours under the protection of argon to obtain precipitate C, which was filtered and washed.

[0031] Dry the precipitate C at 40°C for 5 h under vacuum to obtain vanadium phosphate (VPO 4 )solid.

Embodiment 2

[0033] Weigh 0.05mol (7.825g) vanadium trichloride (VCl 3 ), was added into 100mL deionized water, and ultrasonically dissolved to obtain solution A containing trivalent vanadium ions.

[0034] The pH value of solution A was adjusted to 6 with ammonia water (concentration: 10 wt%), and a large amount of precipitate B was produced in solution A.

[0035] Precipitate B was filtered and washed, dissolved in 100 mL of phosphoric acid solution, and refluxed at 120°C for 4 hours under the protection of argon to obtain precipitate C, which was filtered and washed.

[0036] Dry the precipitate C at 60°C for 2 h under vacuum to obtain vanadium phosphate (VPO 4 )solid.

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Abstract

The invention provides a method for preparing vanadium sodium phosphate and vanadium phosphate serving as an anode material of a sodium ion battery. The method for preparing the vanadium phosphate comprises the following steps: enabling a trivalent vanadium source compound to react with alkali, thus obtaining vanadium hydroxide, wherein the trivalent vanadium source compound is one of the vanadium sulfate and vanadium chloride or a combination of the vanadium sulfate and the vanadium chloride; enabling the vanadium hydroxide to react with a phosphoric acid, thus obtaining the vanadium phosphate. The method for preparing the vanadium sodium phosphate serving as the anode material of the sodium ion battery comprises the following steps: obtaining the vanadium phosphate prepared by adopting the previous method; mixing the vanadium phosphate with sodium phosphate or sodium carbonate, and sintering, thus obtaining the vanadium sodium phosphate serving as the anode material of the sodium ion battery. The method provided by the invention has the advantages that a pentavalent vanadium source compound having toxicity is replaced by the vanadium sulfate or the vanadium chloride containing trivalent vanadium, so that environment protection is realized; a step for reducing the pentavalent vanadium source compound is omitted, a technological process is shortened, the operation is easy, and industrial production is easy.

Description

technical field [0001] The invention belongs to the field of sodium ion battery materials, and in particular relates to a method for preparing sodium vanadium phosphate and vanadium phosphate, which are positive electrode materials for sodium ion batteries. Background technique [0002] Generally, the faster the social economy develops, the greater the demand for energy. At the same time, the problem of environmental degradation caused by the rapid depletion of fossil energy and the burning of fossil energy has become increasingly prominent. In order to reduce the utilization of fossil energy, people began to develop and utilize wind energy and solar energy extensively, but the proportion of abandoning wind and solar energy continues to increase. In order to utilize wind energy and solar energy more effectively, more and more people begin to pay attention to the development of energy storage technology. As a cheap and environmentally friendly new type of energy storage batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCH01M4/5825Y02E60/10
Inventor 陈勇
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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