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Preparation method of vanadium trioxide and nitrogen-doped porous carbon composite negative electrode material

A technology of nitrogen-doped porous carbon and vanadium trioxide, applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve the problems of poor product cycle stability, unfavorable large-scale production, complex synthesis methods, etc., and achieve excellent cycle Stability and rate performance, excellent rate performance, strong interaction effect

Pending Publication Date: 2021-05-28
NANYANG NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The synthesis methods of the prior art are all relatively complicated, have a long cycle and high cost, and are not conducive to large-scale production; the products obtained by the prior art have poor cycle stability

Method used

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  • Preparation method of vanadium trioxide and nitrogen-doped porous carbon composite negative electrode material
  • Preparation method of vanadium trioxide and nitrogen-doped porous carbon composite negative electrode material
  • Preparation method of vanadium trioxide and nitrogen-doped porous carbon composite negative electrode material

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preparation example Construction

[0036] Such as figure 1 As shown, the preparation method of vanadium trioxide and nitrogen-doped porous carbon composite negative electrode material provided by the embodiment of the present invention includes the following steps:

[0037] Step 1: Weigh 1.0g of polyvinylpyrrolidone and 1.0g of sodium chloride, dissolve them in 60mL of deionized water, add 0.5g of ammonium metavanadate under stirring conditions, and stir under 70°C water bath conditions for 3 hours until viscous;

[0038] Step 2: freeze-dry and dry for 24 hours after cooling with liquid nitrogen, and treat the dried sample at 700°C for 1 hour in an argon atmosphere;

[0039] Step 3: The obtained product is washed with deionized water and filtered, and the washed sample is dried in a vacuum oven at 70° C. for 4 hours to obtain a composite negative electrode material of vanadium trioxide and nitrogen-doped porous carbon.

[0040] The composite negative electrode material of vanadium trioxide and nitrogen-doped p...

Embodiment 1

[0054] Weigh 1.0g of polyvinylpyrrolidone and 1.0g of sodium chloride, dissolve them in 60mL of deionized water, add 0.5g of ammonium metavanadate under stirring conditions, stir for 3 hours in a water bath at 70°C until viscous, and cool with liquid nitrogen Freeze-dried for 24 hours, the dried sample was treated in an argon atmosphere at 700°C for 1 hour, the obtained product was washed with deionized water and suction filtered, and the washed sample was dried in a vacuum oven at 70°C for 4 hours to obtain the trioxide Divanadium and nitrogen-doped porous carbon composite negative electrode material.

[0055] Implementation effect: the V prepared in this embodiment 2 o 3 Assembled with nitrogen-doped porous carbon composite anode materials to form a battery for charge and discharge tests, Figure 6 c is the cycle performance diagram of the assembled lithium-ion battery at a current density of 100mA / g and a voltage range of 3-0.01V. It can be seen that the first discharge ...

Embodiment 2

[0057] Weigh 1.0g of polyvinylpyrrolidone, dissolve it in 60mL of deionized water, add 0.5g of ammonium metavanadate under stirring conditions, stir in a water bath at 70°C for 3 hours until viscous, freeze-dry for 24 hours after cooling with liquid nitrogen, and dry The finished sample was treated in an argon atmosphere at 700°C for 1 hour, the obtained product was washed with deionized water and suction filtered, and the washed sample was dried in a vacuum oven at 70°C for 4 hours to obtain the vanadium trioxide doped with nitrogen Carbon composite anode materials. .

[0058] Implementation effect: the vanadium trioxide and nitrogen-doped carbon composite negative electrode material prepared in this example were assembled into a battery for charge and discharge test, and the charge and discharge test was carried out at a current density of 100mA / g, and its initial discharge capacity was 544mAh / g, the discharge capacity is maintained at 283mAh / g after 60 cycles.

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Abstract

The invention discloses a preparation method of vanadium trioxide and nitrogen-doped porous carbon composite negative electrode material. The preparation method comprises the following steps of: adding polyvinylpyrrolidone and sodium chloride into deionized water; after completely dissolving the polyvinylpyrrolidone and sodium chloride, adding ammonium metavanadate under a stirring condition; carrying out water bath heating on an obtained mixed solution to make the mixed solution be in a viscous state; carrying out freeze drying; and calcining a dried product in an inert atmosphere; and finally washing the product with deionized water and carrying out suction filtration to obtain a product. The vanadium trioxide and nitrogen-doped porous carbon composite negative electrode material prepared by the preparation method provided by the invention has excellent cycling stability and rate capability; the synthesis method is green and simple and is low in cost;and the vanadium trioxide and nitrogen-doped porous carbon composite negative electrode material is expected to become an embedded negative electrode material for large-scale use.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a composite negative electrode material of vanadium trioxide and nitrogen-doped porous carbon. Background technique [0002] In order to solve the depletion of fossil energy and serious environmental pollution, the development of new clean energy to replace fossil energy is of great significance to the survival and development of human beings. Due to its high energy density and long service life, lithium-ion batteries have been widely used in the field of portable electronic devices as a clean energy source. However, with the continuous development of society, people's requirements for energy density are getting higher and higher. The lower theoretical capacity of traditional graphite anode materials in commercial lithium-ion batteries can no longer meet the energy storage requirements of high energy density. Therefore, the development of adv...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/0525
CPCH01M4/364H01M4/483H01M4/583H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 张丹杨奇超兰青张纯燕刘光印李玉珠
Owner NANYANG NORMAL UNIV
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