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Preparation method for lithium ion battery cathode material ferric niobate

A technology of lithium ion battery and negative electrode material, applied in the field of lithium ion battery materials and electrochemistry, can solve the problems of complex synthesis method, increase production cost, low capacity, etc., and achieve the effect of excellent electrochemical performance, uniform and fine particles

Inactive Publication Date: 2017-09-29
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, ferric niobate with different structures can be synthesized by hydrothermal method, solid-phase method and co-precipitation method, but the hydrothermal method is suitable for laboratory preparation and cannot meet the needs of commercial mass production; although the solid-phase method can realize commercialization production, but its capacity is too low, which greatly limits its commercial application; although the co-precipitation method can guarantee the yield and performance, the current synthesis method is too complicated, which will increase the production cost, and it is easy to introduce impurities during the preparation process

Method used

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  • Preparation method for lithium ion battery cathode material ferric niobate
  • Preparation method for lithium ion battery cathode material ferric niobate
  • Preparation method for lithium ion battery cathode material ferric niobate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 0.814g NbCl 5 Dissolve in the dehydrated ethanol of 40ml in the anaerobic anhydrous environment of glove box, then transfer to outside the box and stir evenly, then take 1.217g of Fe(NO 3 ) 3 9H 2 O was added to the niobium metal solution and continued to stir for 2h. Aqueous ammonia was added dropwise to the above solution at a rate of 0.5 ml / min using a peristaltic pump, and the pH was adjusted to 9 while stirring continuously.

[0022] After the dropwise addition, the obtained suspension was continuously stirred for more than 12 hours, then filtered with a centrifuge, and washed with deionized water for more than 5 times. The precipitated substance obtained by filtering is dried in a vacuum oven at 80° C. for more than 8 hours, and then ground to obtain the precursor.

[0023] Take the ground precursor hydroxide and place it in a tube furnace for calcination at 900°C for 6 hours. After taking it out, the powder sample obtained by grinding is the target produ...

Embodiment 2

[0027] Take 1.221g NbCl 5 Dissolve in 60ml of absolute ethanol in the anaerobic and anaerobic environment of the glove box, then transfer to the outside of the box and stir evenly, then take 1.826g of Fe(NO 3 ) 3 9H 2 O was added to the niobium metal solution and continued to stir for 2h. Aqueous ammonia was added dropwise to the above solution at 1.0 ml / min by a peristaltic pump, and the pH was adjusted to 9.5 while stirring continuously.

[0028] After the dropwise addition, the obtained suspension was continuously stirred for more than 8 hours, then filtered with a centrifuge, and washed with deionized water for more than 5 times. The precipitated substance obtained by filtering is dried in a vacuum oven at 80° C. for more than 8 hours, and then ground to obtain the precursor.

[0029] Take the ground precursor hydroxide and place it in a tube furnace for calcination at 900°C for 6 hours. After taking it out, the powder sample obtained by grinding is the target product....

Embodiment 3

[0032] Take 1.628g NbCl 5 Dissolve in the dehydrated ethanol of 80ml in the anaerobic and anaerobic environment of glove box, then transfer to outside the box and stir evenly, then take 2.434g of Fe(NO 3 ) 3 9H 2 O was added to the niobium metal solution and continued to stir for 2h. Aqueous ammonia was added dropwise to the above solution at 0.8 ml / min by a peristaltic pump, and the pH was adjusted to 9.2 while stirring continuously.

[0033] After the dropwise addition, the obtained suspension was continuously stirred for more than 16 hours, then filtered with a centrifuge, and washed with deionized water for more than 5 times. The precipitated substance obtained by filtering is dried in a vacuum oven at 80° C. for more than 8 hours, and then ground to obtain the precursor.

[0034] Take the ground precursor hydroxide and place it in a tube furnace for calcination at 900°C for 6 hours. After taking it out, the powder sample obtained by grinding is the target product.

...

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Abstract

The invention discloses a preparation method for lithium ion battery cathode material ferric niobate. The method comprises the following steps: respectively dissolving columbium pentachloride and ferric salt at stoichiometric ratio as shown in the chemical formula of ferric niobate in absolute ethyl alcohol and uniformly stirring and mixing; dropwise adding ammonium hydroxide at constant speed till the pH value of the mixed solution is within 9-9.5 and keeping at room temperature; after completing dropwise adding, continuously stirring for 8-16h, and then centrifugally washing and drying, thereby acquiring a precursor hydroxide of the material; grinding the precursor hydroxide and sintering for 6h at 900 DEG C. The method for preparing the ferric niobate is simple in steps, is convenient for industrial mass production, can acquire fine and uniform compounded product particles and can guarantee the circulation capacity and electrochemical performance of the material.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery negative electrode material, in particular to a preparation method of a lithium ion battery negative electrode material ferric niobate, belonging to the field of lithium ion battery materials and electrochemistry. Background technique [0002] Lithium-ion batteries have become the most promising energy storage devices due to their excellent properties such as high capacity, long cycle life, high safety, and less pollution. The negative electrode material plays a very important role in the construction of the battery. As the negative electrode of commercial lithium-ion batteries, although graphite has the advantages of high electronic conductivity and small volume phase change before and after lithium intercalation, its theoretical capacity is only 372mAh / g, and it also has low operating voltage platform, poor rate performance, and lithium dendrites. security issues and other disadv...

Claims

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Application Information

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IPC IPC(8): C01G49/00H01M4/58H01M10/0525
CPCC01G49/00C01P2002/72C01P2004/03C01P2006/40H01M4/5825H01M10/0525Y02E60/10
Inventor 钱斌孔凡军陶石张惠国
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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