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Sol-gel preparation method of lithium vanadate negative electrode material of lithium ion battery

A battery lithium vanadate and negative electrode material technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of no obvious improvement in electrical conductivity, low intrinsic conductivity of lithium vanadate, etc., and achieve improved electrical conductivity. Chemical properties, good cycle performance, the effect of reducing production costs

Active Publication Date: 2014-12-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current synthesis methods for this material are limited to the general high-temperature solid-phase method or sol-gel method under air atmosphere. However, due to the low intrinsic conductivity of lithium vanadate, these two synthesis methods are not suitable for this material. The electrical conductivity of the material did not improve significantly

Method used

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  • Sol-gel preparation method of lithium vanadate negative electrode material of lithium ion battery
  • Sol-gel preparation method of lithium vanadate negative electrode material of lithium ion battery
  • Sol-gel preparation method of lithium vanadate negative electrode material of lithium ion battery

Examples

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Effect test

Embodiment 1

[0036] Dissolve 3.091g of lithium acetate in 60mL of distilled water, and add 0.918g of vanadium pentoxide powder and 2.112g of citric acid in sequence under magnetic stirring to form a light blue solution. The amount of citric acid is added according to the ratio of citric acid: vanadium = 1:1, and other substances are added according to the stoichiometric ratio Li:V = 3:1. Place the mixed solution in a constant temperature water bath at 80°C and gradually evaporate the water to dryness under the condition of magnetic stirring. After forming a xerogel, put it in a vacuum drying oven at 80°C to continue drying the water completely. Then the dried samples were put into ceramic crucibles and placed in a quartz tube furnace at 30% H 2 + 70% Ar (volume fraction ratio) pre-fired at 400°C for 4 hours in a reducing atmosphere, after cooling, take it out and grind it carefully, then treat it at 650°C for 6 hours under the same atmosphere conditions, and obtain a carbon-coated lithium...

Embodiment 2

[0038] Dissolve 1.131g of lithium carbonate in 60mL of distilled water, add 0.918g of vanadium pentoxide powder and 2.112g of citric acid in turn under the condition of magnetic stirring, and finally form a blue solution with the generation of a large number of bubbles. The amount of citric acid is added according to the ratio of citric acid: vanadium = 1:1, and other substances are added according to the stoichiometric ratio Li:V = 3:1. Place the mixed solution in a constant temperature water bath at 75°C and gradually evaporate the water to dryness under the condition of magnetic stirring. After forming a xerogel, put it in a vacuum drying oven at 90°C to continue drying the water completely. Then put the dried sample into a ceramic crucible, put it into a quartz tube furnace, and pre-fire it at 350°C for 4 hours under a nitrogen atmosphere, take it out after cooling, grind it carefully, and then treat it at 800°C for 6 hours under the same atmosphere condition, and cool it n...

Embodiment 3

[0040] Dissolve 1.259g of lithium hydroxide in 60mL of distilled water, and add 0.918g of vanadium pentoxide powder and 1.820g of glucose in sequence under magnetic stirring to form a blue solution. Among them, the amount of glucose is added according to the ratio of the amount of substance glucose: vanadium = 1:1, and other substances are added according to the stoichiometric ratio Li:V = 3:1. Place the mixed solution in a constant temperature water bath at 70°C and gradually evaporate the water to dryness under the condition of magnetic stirring. After forming a xerogel, put it in a vacuum drying oven at 90°C to continue drying the water completely. Then put the dried sample into a ceramic crucible, put it into a quartz tube furnace, and pre-fire it at 350°C for 4 hours under a nitrogen atmosphere, take it out after cooling, grind it carefully, and then treat it at 500°C for 6 hours under the same atmosphere condition, and cool it naturally Finally, a carbon-coated lithium v...

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Abstract

The invention relates to a sol-gel preparation method of a lithium vanadate negative electrode material of a lithium ion battery. The sol-gel preparation method comprises the following steps: sequentially adding a precursor containing a vanadium compound and a precursor containing a lithium compound into water, and stirring fully; then adding a water soluble carbon material which is acted as a chelate and a carbon source, stirring the water solution until dry gel is formed, carrying out vacuum drying until the water content is dried completely, putting a gel body into a porcelain boat, pretreating in the reducing atmosphere or the inert atmosphere, and carrying out sintering reaction in the inert atmosphere or the reducing atmosphere so as to obtain the material. According to the method, the technology is simple, the operation is easy, and moreover, the structure of lithium vanadate and the valence state of vanadium cannot be changed by the existence of the carbon material and the reducing atmosphere. The carbon-coated lithium vanadate material synthesized by the method, which acts as the negative electrode material of the lithium ion battery, has excellent performance and low lithium intercalation potential, and is expected to be as the negative electrode material of the next generation of lithium ion batteries. The synthesis method is suitable for producing the negative electrode material of the high-performance lithium ion battery, namely lithium vanadate.

Description

technical field [0001] The invention relates to a sol-gel preparation method of a negative electrode material of a lithium ion battery. The lithium vanadate negative electrode material synthesized by this method has excellent electrochemical performance and low lithium intercalation potential (0.1-1V), and is expected to become the negative electrode material of the next generation of lithium-ion batteries. Background technique [0002] The operating voltage of lithium-ion batteries is relatively high. The operating voltage of commercialized general single lithium-ion batteries using lithium cobaltate as the positive electrode material is 3.6V, which is three times the operating voltage of ordinary MH-Ni and Cd-Ni batteries; At the same time, it has the advantages of small size, light weight, high mass-to-volume specific energy, large output power, long cycle life, fast charge and discharge, low self-discharge rate, and no memory effect. It has been widely used in various po...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/62H01M4/58C01G31/00
CPCC01G31/00H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 赵彦明梁志勇董有忠
Owner SOUTH CHINA UNIV OF TECH
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