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Preparation method and application for vanadium trioxide negative electrode material

A negative electrode material, ammonium vanadate technology, applied in the field of preparation of vanadium trioxide negative electrode material, can solve the problems of long preparation cycle, high temperature, high energy consumption, etc., and achieve high equipment cost, large consumption, and safety factor high effect

Active Publication Date: 2018-09-21
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this invention is to provide a kind of preparation V 2 o 3 The preparation method of negative electrode material and application thereof, to overcome the preparation of V in the prior art 2 o 3 Defects such as high temperature, high energy consumption, and long preparation cycle

Method used

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  • Preparation method and application for vanadium trioxide negative electrode material
  • Preparation method and application for vanadium trioxide negative electrode material
  • Preparation method and application for vanadium trioxide negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) V 2 o 3 Preparation of negative electrode material:

[0030] a Cut a silicon wafer, place the silicon wafer in a beaker filled with ethanol, perform ultrasonic cleaning, and then use acetone to perform ultrasonic cleaning to remove impurities on the silicon wafer, and finally dry the silicon wafer and place it on graphite side of the crucible.

[0031] b Weigh 2mmol (0.234g) of ammonium metavanadate (NH 4 VO 3 ) powder, spread the powder on the smooth side of the silicon wafer; take 10mmol (0.07g) of lithium wafer and place it on the other side of the graphite crucible.

[0032] c Finally, put the crucible into the tube furnace, with the side with the lithium sheet facing the direction of the air inlet, high-purity nitrogen gas for high-temperature calcination, the calcination temperature is 480°C, the heating rate is 5°C / min, and the temperature is kept for 2h. After the calcination is completed, it is naturally cooled to room temperature to prepare V 2 o3 Ne...

Embodiment 2

[0038] In Example 1, the pure nitrogen was changed to pure helium, the calcination temperature was changed from 480°C to 580°C, and other reaction conditions and performance testing methods were exactly the same as in Example 1.

[0039] image 3 a is V in Example 2 2 o 3 The scanning electron microscope (SEM) spectrum of the negative electrode material, it can be seen from the figure that the shape of the material is a broken block, and it can be clearly observed that the block material is composed of many particles. The average block size is about 9 microns, and the grain size of the particles is 32.39 nm. It shows that with the increase of temperature, the material decomposes further.

[0040] image 3 b is the discharge cycle specific capacity curve of the material of Example 2. Under the current density of 100mA / g, the discharge specific capacity decreased significantly in the first 30 weeks, and then gradually stabilized. After 150 weeks of charge and discharge cycle...

Embodiment 3

[0042] In Example 1, the pure nitrogen gas was changed to pure neon gas, the calcination temperature was changed from 480° C. to 680° C., and other reaction conditions and performance testing methods were exactly the same as those in Example 1.

[0043] Figure 4 a is V in Example 3 2 o 3 The scanning electron microscope (SEM) spectrum of the negative electrode material, from which it can be observed that V 2 o 3 The shape of the negative electrode material is completely granular, the average particle size of the particles is about 0.25 microns, and the grain size is 29.73 nanometers. It shows that when calcined at 680℃, the material is completely decomposed from block to granular, and the calcining temperature has a great influence on the morphology and structure of the material.

[0044] Figure 4 b is V in Example 3 2 o 3 The discharge cycle specific capacity curve of the negative electrode material shows that at a current density of 100mA / g, the discharge specific c...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method and application for a vanadium trioxide negative electrode material. The preparation method for the vanadium trioxide negative electrode material comprises the steps that an ammonium vanadate compound is taken as a precusor substance, a silicon wafer is taken as a carrier, a lithium sheet is taken as a reducing agent, the above substances are placed in a crucible and is calcined in a tube furnace, the above substance is cooled to the indoor temperature naturally, and a V2O3 negative material is obtained. The preparation method is simple and feasible, the production cost is low, and the safety coefficient is high; the prepared V2O3 negative material is of a multi-level structure, and material shape can be controlled. In addition, the prepared V2O3 negative material is used for assembling a half cell, the result shows that the V2O3 negative material is high in specificcapacity, good in rate capability and stable in circular performance. The prepared V2O3 material is taken as the negative material to produce lithium ion batteries and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method and application of a vanadium trioxide negative electrode material. Background technique [0002] In today's world, energy issues have become a stumbling block to the development of various countries. With the depletion of traditional energy sources, it is imminent to develop new energy technologies. At present, lithium-ion batteries have been widely used due to their excellent characteristics. As a substitute for traditional lead-acid batteries, nickel-cadmium batteries, etc., lithium-ion batteries cater to the current market due to their advantages such as high energy density, long service life, high rated voltage, light weight, high and low temperature adaptability, and environmental protection. market demand. As a kind of electrode material for lithium-ion batteries, vanadium material system has a good development prospect due...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02H01M4/48H01M10/0525
CPCC01G31/02C01P2002/72C01P2004/03C01P2004/64H01M4/48H01M10/0525H01M2004/027Y02E60/10
Inventor 刘良王亢亢戴玮王丽梅李国春盘朝奉陈龙
Owner JIANGSU UNIV
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