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Method for preparing vanadium pentoxide cathode nano-material of lithium-ion battery

A technology of vanadium pentoxide nanometer, lithium ion battery, applied in vanadium oxide, battery electrode, nanotechnology and other directions, can solve the problems of poor cycle stability, high synthesis cost, large energy consumption, etc., and achieves short time consumption and production cost. Low, simple device effect

Inactive Publication Date: 2012-11-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The material has a high initial specific capacity (351mAh / g) when charged and discharged at a current density of 50mA / g in a voltage range of 1.5-4.0V, but the capacity loss is serious, and the discharge specific capacity is only 175mAh / g after 20 cycles.
[0005] The vanadium pentoxide nanomaterial introduced above is used as the positive electrode material of lithium-ion batteries, and has a high initial specific capacity, but its cycle stability is relatively poor, and the experimental process takes a long time, consumes a lot of energy, and the synthesis cost is high.

Method used

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  • Method for preparing vanadium pentoxide cathode nano-material of lithium-ion battery
  • Method for preparing vanadium pentoxide cathode nano-material of lithium-ion battery
  • Method for preparing vanadium pentoxide cathode nano-material of lithium-ion battery

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Effect test

Embodiment 1

[0027] Add 0.364g vanadium pentoxide powder into 30mL hydrogen peroxide solution with a mass fraction of 15%, stir until vanadium pentoxide is completely dissolved to form a red perovanadic acid solution, and generate a large amount of gas and heat, continue stirring at room temperature After 2 hours, the solution was dried at 70°C to form a vanadium pentoxide gel to obtain a solid precursor. The precursor was heated to 400°C at a heating rate of 5°C / min in air and kept at 400°C for 2 hours. After cooling to room temperature, vanadium pentoxide nanometer material is obtained. figure 1 Shown is the XRD spectrum of the vanadium pentoxide prepared in Example 1. The obtained peaks are consistent with the cards, and the synthesized vanadium pentoxide belongs to the orthorhombic crystal system and the space group Pmmm. figure 2 Shown is the SEM picture of the vanadium pentoxide prepared by embodiment 1, image 3 Shown is the TEM picture of the vanadium pentoxide prepared in Examp...

Embodiment 2

[0030] Add 0.5g vanadium pentoxide powder into 10mL hydrogen peroxide solution with a mass fraction of 15%, stir until vanadium pentoxide is completely dissolved to form a red perovanadic acid solution, and generate a large amount of gas and heat, continue stirring at room temperature After 6 hours, the solution was dried at 40°C to form a vanadium pentoxide gel to obtain a solid precursor. The precursor was heated to 250°C at a heating rate of 1°C / min in air and kept at 250°C for 6 hours. After cooling to room temperature, vanadium pentoxide nanometer material is obtained.

Embodiment 3

[0032] Add 0.5g vanadium pentoxide powder into 15mL hydrogen peroxide solution with a mass fraction of 10%, stir until the vanadium pentoxide completely dissolves to form a red perovanadic acid solution, and generate a large amount of gas and heat, continue stirring at room temperature After 4 hours, the solution was dried at 60°C to form a vanadium pentoxide gel to obtain a solid precursor. The precursor was heated to 500°C at a heating rate of 10°C / min in air and kept at 500°C for 0.5 hours. After cooling to room temperature, vanadium pentoxide nanometer material is obtained.

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Abstract

A method for preparing a vanadium pentoxide cathode nano-material of a lithium-ion battery comprises the following steps of: adding vanadium oxide to hydrogen peroxide solution with the mass fraction of 5-15%, stirring until vanadium oxide is completely dissolved to generate red peroxy-vanadic acid (HVO4) solution, continuing stirring at the room temperature for 1-6 h, and then heating the mixed solution until the temperature reaches 40-90 DEG C, and drying to form gel; and sintering the gel in air by increasing the temperature to 250-500 DEG C, thereby obtaining the vanadium pentoxide nano-material, wherein the quantity of addition of vanadium oxide is determined as 0.01-0.05 g per one milliliter according to the volume of the hydrogen peroxide solution. The process method provided by the invention is simple and convenient to operate; the prepared vanadium pentoxide cathode nano-material is good in cycle performance and long in service life; and the preparation method is simple in equipment required, moderate in reaction condition, short in time taken, friendly to environment, and low in production cost, thereby being suitable for large-scale industrial production.

Description

technical field [0001] The invention discloses a method for preparing a vanadium pentoxide nanometer cathode material of a lithium ion battery, and belongs to the technical field of preparation of the cathode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in daily high-end electronic devices because of their high energy density, good cycle performance, no memory effect and environmental friendliness. In response to the worldwide energy crisis, lithium-ion batteries are being considered for use in electric vehicles. However, considering that the capacity of existing cathode materials is relatively low, about 140mAh / g, the development of new high-capacity cathode materials for lithium-ion batteries has important theoretical research significance and practical application value. [0003] Vanadium pentoxide cathode material is suitable for accommodating a large amount of Li due to its + The layered structure of ions, high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02H01M4/48B82Y30/00
CPCY02E60/12Y02E60/10
Inventor 梁叔全秦牡兰潘安强刘军唐艳张清
Owner CENT SOUTH UNIV
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