Method of preparing lithium battery vanadate positive materials by utilizing hydrothermal method

A cathode material, lithium battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of electrochemical performance limitation, serious particle agglomeration, long reaction time, etc., to achieve short preparation cycle, high purity, low production cost Effect

Inactive Publication Date: 2013-11-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional high-temperature solid-phase method is to mix vanadium salts and soluble salts by ball milling, and then sinter at a high temperature above 600°C. This method has high synthesis temperature, long reaction time, serious particle agglomeration, and poor electrochemical performance. Subject to certain restrictions; the synthesis of vanadate by sol-gel method often requires pretreatment and then calcination, and the process is more complicated

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  • Method of preparing lithium battery vanadate positive materials by utilizing hydrothermal method
  • Method of preparing lithium battery vanadate positive materials by utilizing hydrothermal method
  • Method of preparing lithium battery vanadate positive materials by utilizing hydrothermal method

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Embodiment 1

[0023] Weigh 0.3g NH 4 VO 3 Add 35ml of deionized water into a beaker, then add 2ml of hydrogen peroxide with a volume fraction of 30%, and stir on a magnetic stirrer until the solution turns yellow; weigh another 0.4356g of AgNO 3 Slowly add to the above solution, continue to stir for 20 minutes to mix evenly to obtain a clear solution; then transfer the obtained solution to a 50mL autoclave, conduct a hydrothermal reaction at 190°C for 24 hours, and cool to room temperature with the furnace; after centrifugation, Then dry it in a blast oven at 60°C to get AgVO 3 Cathode material. figure 1 It is the XRD spectrum of Example 1 of the present invention. As can be seen from the figure, the synthesized material has good crystallinity and high purity. figure 2 Shown is the AgVO prepared by embodiment 1 3 Scanning electron microscope image of the cathode material. The AgVO that embodiment 1 obtains 3 The positive electrode material is in the form of a nanoribbon structure wi...

Embodiment 2

[0027] Weigh 0.8g NH 4 VO 3 Add 35ml of deionized water into a beaker, then add 2ml of hydrogen peroxide with a volume fraction of 30%, and stir on a magnetic stirrer until the solution turns yellow; add 0.0439g of NaF to the above solution slowly, and continue stirring for 20 minutes to make Mix them evenly to obtain a clear yellow solution; then transfer the obtained solution to a 50mL autoclave for hydrothermal reaction at 205°C for 48 hours, then cool to room temperature with the furnace; Drying; the resulting material is raised to 300-500°C for 4 hours at a heating rate of 5°C / min in a muffle furnace to obtain sodium vanadate Na 0.33 V 2 o 5 Cathode material. Figure 4 It is the XRD spectrum of Example 2 of the present invention. As can be seen from the figure, the synthesized material has good crystallinity and high purity.

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Abstract

The invention discloses a method of preparing lithium battery vanadate positive materials by utilizing a hydrothermal method. The method comprises the following steps of: mixing ammonium metavanadate and a hydrogen dioxide solution in 35ml deionized water, stirring the mixture under an indoor temperature until obtaining a clear yellow solution, adding soluble salt of stoichiometric ratio into the solution, continuing stirring the solution so as to uniformly mix, shifting the solution into a 50ml autoclave, and carrying out a hydrothermal reaction, thus obtaining the lithium battery vanadate positive materials after the hydrothermal method or sintering after the hydrothermal method. According to the method provided by the invention, the lithium battery vanadate positive materials, such as AgVO3 and Na0.33V2O5, prepared by the method have the good electrochemical property, the preparation period is short, the process is simple, the productive rate of a product is large, and the purity is high.

Description

technical field [0001] The invention belongs to the technical field of preparation of cathode materials for lithium ion batteries, and relates to a simple and practical method for preparing vanadate cathode materials. Background technique [0002] Due to its high energy density, high specific capacity, high working voltage, good safety performance, and environmental protection, lithium-ion batteries have been widely used in implantable medical devices and portable consumer electronics, and even in large-scale energy storage such as electric vehicles. The field also shows good development prospects. Generally, a lithium-ion battery is composed of a positive electrode, a negative electrode, an electrolyte, a separator, a current collector, a battery case, and a lead. Cathode material is the key factor to determine battery performance and price, and the capacity of existing cathode materials is relatively low, about 140mAh / g. The development of new high-capacity lithium-ion ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 梁叔全周江潘安强方国赵唐艳
Owner CENT SOUTH UNIV
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