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Preparation method of core-shell structure vanadium trioxide microspheres

A technology of vanadium trioxide microspheres and core-shell structure, which is applied in the direction of vanadium oxide, chemical instruments and methods, and structural parts, and can solve problems such as uneven shape and size, small specific surface area of ​​products, and poor safety, and achieve shape and size Uniformity, low price, high abundance effect

Inactive Publication Date: 2014-03-12
HEILONGJIANG UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of high cost, cumbersome steps and poor safety of the existing method for synthesizing vanadium trioxide, as well as the problems of small specific surface area, uneven shape and size, large particle size and poor stability of the product, and provide a core Preparation method of shell structure vanadium trioxide microspheres

Method used

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  • Preparation method of core-shell structure vanadium trioxide microspheres
  • Preparation method of core-shell structure vanadium trioxide microspheres
  • Preparation method of core-shell structure vanadium trioxide microspheres

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specific Embodiment approach 1

[0021] Specific embodiment one: the preparation method of the core-shell structure vanadium trioxide microspheres of this embodiment is carried out according to the following steps:

[0022] 1. Add ammonium metavanadate into the solvent under the condition of 30℃~70℃, and prepare a solution with a concentration of 0.20~0.40mol / L;

[0023] 2. Add the solution obtained in step 1 into a high-pressure reactor, keep it warm at 180°C to 220°C for 8 to 15 hours, and then cool to room temperature;

[0024] 3. Centrifuge the cooled turbid liquid in step 2 at 3000-4000r / min for 2-5min, separate and collect the solid product, wash the obtained solid product with absolute ethanol for 2-3 times, then put the washed solid product into vacuum drying In the box, dry at 30℃~70℃ for 10~24h;

[0025] 4. Calcining the dried sample obtained in step 3 at 500° C. to 700° C. for 2 to 5 hours under nitrogen protection, and cooling to room temperature to obtain vanadium trioxide microspheres with a co...

specific Embodiment approach 2

[0029] Embodiment 2: This embodiment is different from Embodiment 1 in that the solvent described in step 1 is ethylene glycol, 1,3-propanediol or glycerol. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0030] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: under the condition of 30 ℃ described in step one, ammonium metavanadate is added in ethylene glycol, and the concentration is 0.20mol / L solution. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a preparation method of vanadium trioxide microspheres, particularly a preparation method of core-shell structure vanadium trioxide microspheres. The method aims to solve the problems of high cost, complex steps and poor safety in the existing vanadium trioxide synthesis method, and the problems of small specific area, nonuniform shape and size, large particle size and poor stability in the product. The method comprises the following steps: 1. adding ammonium metavanadate into a solvent; 2. keeping the temperature at 180-220 DEG C for 8-15 hours; 3. washing the solid product, and drying; and 4. calcining. The method is simple and easy to implement and low in raw material cost; and the prepared material has the advantages of large specific area, high surface roughness, small particle size, uniform shape and size, stable chemical structure, high safety and the like. The method is used for preparing vanadium trioxide microspheres.

Description

technical field [0001] The invention relates to a preparation method of vanadium trioxide microspheres. Background technique [0002] In today's information-rich, mobile and energy-conscious society, there is an urgent need for safe, low-cost, high-energy-density and long-lasting rechargeable lithium-ion batteries. Among a variety of electrode materials for lithium-ion batteries, the core-shell structure Due to its large specific surface area, the material can better promote the insertion and extraction of lithium ions in lithium-ion batteries, thereby better improving the charge-discharge performance of lithium-ion batteries, and greatly improving its specific capacity and electrochemical stability. Therefore, Core-shell materials are widely used in lithium-ion batteries. [0003] However, in the existing methods for synthesizing vanadium trioxide, most of the processes have problems such as high cost, cumbersome steps, poor safety, etc., and the product has a large partic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48C01G31/00B82Y40/00
CPCC01G31/02H01M4/483Y02E60/10
Inventor 付宏刚姜乐曲阳于鹏赵冬冬
Owner HEILONGJIANG UNIV
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