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Method for preparing anode material lithium vanadium phosphate of lithium ion battery by microwave sintering

A lithium-ion battery and cathode material technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high cost and poor performance, and achieve low production cost, good reproducibility, and simple process control Effect

Inactive Publication Date: 2011-01-26
HENAN UNION NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved in the present invention is: to overcome the lithium ion battery cathode material Li in the prior art 3 V 2 (PO 4 ) 3 The shortcomings of high cost and poor performance of preparation provide a lithium-ion battery cathode material Li with simplified process, low cost and low energy consumption. 3 V 2 (PO 4 ) 3 preparation method

Method used

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  • Method for preparing anode material lithium vanadium phosphate of lithium ion battery by microwave sintering
  • Method for preparing anode material lithium vanadium phosphate of lithium ion battery by microwave sintering
  • Method for preparing anode material lithium vanadium phosphate of lithium ion battery by microwave sintering

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Effect test

Embodiment 1

[0041] Embodiment one: Lithium-ion battery cathode material Li 3 V 2 (PO 4 ) 3 preparation method

[0042] (1) Place the 7360g V 2 o 5 Mix it with 13,800 grams of 85% phosphoric acid and stir evenly to make V 2 o 5 Dissolved in phosphoric acid, let it stand for 4 hours to get the vanadyl ion and V 2 o 5 , a mixture of phosphoric acid; the vanadyl ion is VO 3+ 、VO + Wait;

[0043] (2) Dissolve 2,400 grams of sucrose in 8,000 mL of purified water, and stir evenly to obtain an aqueous solution of sucrose;

[0044] (3) 5100 g of LiOH·H 2 O was added to the above aqueous sucrose solution, stirred evenly to obtain a mixture;

[0045] (4) Mix the mixture of step (3) and step (1), and stir evenly to obtain a paste precursor, and let it stand for 4 hours;

[0046] (5) Put the paste precursor into a silicon carbide crucible, put the silicon carbide crucible into an industrial microwave oven, raise the temperature to 780°C at a rate of 6°C per minute, and keep it for 30 m...

Embodiment 2

[0049] Embodiment two: Lithium-ion battery cathode material Li 3 V 2 (PO 4 ) 3 preparation method

[0050] (1) Place the 7360g V 2 o 5 Mix it with 13,800 grams of 85% phosphoric acid and stir evenly to make V 2 o 5 Dissolved in phosphoric acid, let it stand for 2 hours to get the vanadyl ion and V 2 o 5 , a mixture of phosphoric acid;

[0051] (2) Dissolve 2,000 grams of glucose in 1,100 mL of purified water, and stir evenly to obtain an aqueous glucose solution;

[0052] (3) 4600 grams of Li 2 CO 3 Adding to the aqueous glucose solution prepared in step (2), stirring evenly to obtain a mixture;

[0053] (4) Add the mixture of step (3) to the mixture of step (1), stir evenly to obtain a paste precursor, and let it stand for 2 hours;

[0054] (5) Put the paste precursor into a kraft paper crucible, put the kraft paper crucible into an industrial microwave oven, raise the temperature to 720°C at a rate of 8°C per minute, and keep it for 20min to obtain the positiv...

Embodiment 3

[0056] Embodiment three: Lithium-ion battery cathode material Li 3 V 2 (PO 4 ) 3 preparation method

[0057] (1) Place the 7360g V 2 o 5 Mix it with 13,800 grams of 85% phosphoric acid and stir evenly to make V 2 o 5 Dissolved in phosphoric acid, let it stand for 3 hours, and get the initial reacted vanadyl ion and V 2 o 5 , a mixture of phosphoric acid;

[0058] (2) Dissolve 2,000 grams of citric acid in 17,000 mL of pure water, and stir evenly to obtain an aqueous solution of citric acid;

[0059] (3) Add 13000 grams of lithium acetate to the aqueous citric acid solution in step (2), stir evenly to obtain a mixture;

[0060] (4) Mix the mixture of step (3) and the mixture of step (1), and stir evenly to obtain a paste precursor; let it stand for 3 hours;

[0061] (5) Put the paste precursor into a glass crucible, put the glass crucible into an industrial microwave oven, heat up to 750°C at a rate of 10°C per minute, and keep it for 25min to obtain the positive e...

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PUM

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Abstract

The invention relates to a method for preparing an anode material for a Li3V2(PO4)3 lithium ion battery, belonging to the field of lithium ion battery materials. The method comprises the following steps: weighing a lithium source compound, V2O5 and phosphoric acid according to a molar ratio that Li to V to P is 3:1.8-2.0:2.8-3.0; mixing the V2O5 and the phosphoric acid, uniformly stirring, and standing for 2 to 4 hours to obtain mixture A of primary reaction; adding the lithium source compound into carbon source compound water solution to prepare mixture, adding the mixture into the mixture A, uniformly stirring to obtain a pasty precursor; and placing the pasty precursor into a microwave oven, heating to the temperature of between 700 and 800 DEG C at the heating rate of between 5 and 15 DEG C / min, and cooling to room temperature after 20 to 55min of heat treatment. The method has the advantages of rich production raw material sources, simple preparation process, easy control, low energy consumption, low cost, high product purity, stable quality and excellent electrochemical performance, and can be widely applied to industrial production.

Description

technical field [0001] The present invention relates to a kind of preparation method of positive electrode active material of lithium ion battery, particularly relate to a kind of lithium ion battery positive electrode material Li 3 V 2 (PO 4 ) 3 method of preparation. Background technique [0002] Due to its high output voltage, high specific energy, long cycle life, small self-discharge, safety, and no memory effect, lithium-ion batteries have become the focus of the development of new energy materials in countries around the world. The positive electrode material is lithium-ion The key to the battery. At present, the main cathode materials are: lithium cobaltate, lithium nickelate, lithium manganate, etc., but only lithium cobaltate has been produced on a large scale in China. Since cobalt is a precious metal with limited resources and toxicity, its development is restricted, and lithium cobalt oxide has potential safety hazards, so people are working hard to find su...

Claims

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Application Information

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IPC IPC(8): C01B25/45
Inventor 刘新保贾晓林李恩惠周永刚蔡俊明
Owner HENAN UNION NEW ENERGY