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Lithium vanadate anode material and preparation method thereof

A positive electrode material, lithium vanadate technology, applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problem that the rate performance needs to be improved, and achieve the effects of fast capacity decay, improved cycle performance, and stable structure

Inactive Publication Date: 2013-05-08
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the lithium vanadate prepared by this method has good cycle performance, the rate performance needs to be improved.

Method used

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  • Lithium vanadate anode material and preparation method thereof
  • Lithium vanadate anode material and preparation method thereof
  • Lithium vanadate anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Dissolve 0.5 g of vanadium acetylacetone in 30 mL of dimethylformamide solution and continue to stir for 5 hours. The resulting clear solution is transferred to a 30-50 mL Teflon-lined stainless steel reactor, and sealed. Heated at 150° C. for 10 hours, then cooled to room temperature. The resulting black precipitate was washed several times with distilled water, and the resulting precipitate was dried.

[0033] The synthesized product is V of the hollow structure of the present invention. 2 o 3 Materials, SEM images, TEM images such as figure 1 shown. It can be seen that the particle size of the obtained product is relatively uniform and the particle size is small; at the same time, it can be seen that the sample has a hollow structure and good particle dispersion.

[0034] The above obtained V 2 o 3 Precursor and LiOH·H 2 O was compounded at a molar ratio of 1.5:1.05, and after being uniformly mixed in the solution, the product was first dried at 80°C, and then...

Embodiment 2

[0041] Dissolve 0.5 g of vanadium acetylacetone in 30 mL of dimethylformamide solution and continue to stir for 5 hours. The resulting clear solution is transferred to a 30-50 mL Teflon-lined stainless steel reactor, and sealed. Heated at 150° C. for 5 hours, then cooled to room temperature. The resulting black precipitate was washed several times with distilled water, and the resulting precipitate was dried.

[0042] The above obtained V 2 o 3 Precursor and LiOH·H 2 O is compounded according to a molar ratio of 1.5:1.05. After mixing evenly in the solution, the product is first dried at 80°C, and then sintered at 450°C for 10 hours to obtain the final product. The particle size of the obtained material is about 420nm, the thickness of the hollow spherical shell is about 170nm, the pore diameter of the small hole of the shell is about 2.10nm, the pore diameter of the large hole is about 10nm, and the specific surface area of ​​the material is about 62.75m 2 / g

Embodiment 3

[0044] Dissolve 0.5 g of vanadium acetylacetone in 30 mL of dimethylformamide solution and continue to stir for 5 hours. The resulting clear solution is transferred to a 30-50 mL Teflon-lined stainless steel reactor, and sealed. Then heated at 150°C for 8 hours, then cooled to room temperature. The resulting black precipitate was washed several times with distilled water, and the resulting precipitate was dried.

[0045] The above obtained V 2 o 3 Precursor and LiOH·H 2 O is compounded according to a molar ratio of 1.5:1.05. After mixing evenly in the solution, the product is first dried at 80°C, and then sintered at 450°C for 10 hours to obtain the final product. The particle size of the obtained material is about 400nm, the thickness of the hollow spherical shell is about 120nm, the diameter of the small hole in the shell is about 3.60nm, the diameter of the large hole is about 25nm, and the specific surface area of ​​the material is about 82.87m 2 / g.

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Abstract

The invention discloses a lithium vanadate anode material which consists of nanosphere-shaped lithium vanadate particles with hollow core-shell structures, wherein nano holes are distributed in the core-shell layer. The preparation method comprises the following steps: dissolving a compound containing tetravalent vanadium in a reducing solvent, stirring until the solution is clarified, transferring the obtained clarified liquor into a sealed reaction kettle for carrying out a reduction reaction, cooling the liquor to room temperature after the reduction reaction is finished so as to obtain a nano V2O3 precipitate with a hollow structure; dissolving the obtained nano V2O3 precipitate and a lithium source compound in an organic solvent for sharply stirring, drying the products obtained in the reaction, and sintering the products to obtain the particles. The positive active material of the prepared lithium vanadium oxide has a hollow structure, is small in particle size, high in dispersing property, high in electric capacity and high in stability and has high cycle performance and high rate performance; and moreover, in the whole process, the synthesis temperature is low, the energy loss is low, the operation is easy and large-scale production can be performed.

Description

technical field [0001] The invention discloses a preparation method of a lithium vanadate cathode material, belonging to the technical field of lithium ion battery material preparation technology. Background technique [0002] Lithium-ion battery, as a new type of green battery, has been gradually replacing the traditional secondary batteries due to its advantages of high working voltage, light weight, large specific energy, small self-discharge rate, long cycle life, no memory effect, and no environmental pollution. The position of secondary batteries such as lead-acid batteries, nickel-cadmium batteries, and nickel-metal hydride batteries has become an ideal power source for small and lightweight electronic devices such as cameras, mobile phones, notebook computers, and portable measuring instruments, as well as environmentally friendly electric vehicles. Since Japan successfully developed lithium-ion batteries and put them on the market in 1990, there has been a wave of l...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 刘军刘伟籍少敏万艳玲周益春
Owner XIANGTAN UNIV
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