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Preparation method of spherical lithium-ion secondary battery cathode material vanadium phosphate monohydrate

A secondary battery and positive electrode material technology, applied in the field of electrochemistry, to achieve the effects of good wetting, high specific surface area, and good crystallinity

Inactive Publication Date: 2015-12-23
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore VPO 4 ·H 2 O is a lithium-ion secondary battery cathode material with great potential value. At present, there is no domestic research on VPO 4 ·H 2 Preparation report of O as a cathode material for lithium-ion secondary batteries

Method used

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  • Preparation method of spherical lithium-ion secondary battery cathode material vanadium phosphate monohydrate
  • Preparation method of spherical lithium-ion secondary battery cathode material vanadium phosphate monohydrate
  • Preparation method of spherical lithium-ion secondary battery cathode material vanadium phosphate monohydrate

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preparation example Construction

[0023] A preparation method of vanadium phosphate monohydrate, a positive electrode material for a spherical lithium-ion secondary battery, comprising the following steps:

[0024] 1) Change the H 3 PO 4 and VCl 3 According to the molar ratio of 3:1~5:1, add it into the polytetrafluoroethylene reactor, add water and stir to mix, adjust the pH value to 1.5~3.5 while stirring, then seal the polytetrafluoroethylene reactor, and stir for 45~50h ;

[0025] 2) Put the reaction kettle into the muffle furnace to heat up at a rate of 5°C / min. When the temperature rises to 150~200°C, keep it warm for 70~75h;

[0026] 3) Lower the reaction kettle to room temperature at a rate of 5°C / min to obtain a light green precipitate, wash and dry the obtained precipitate to obtain the target product VPO 4 ·H 2 O.

Embodiment 1

[0028] A preparation method of vanadium phosphate monohydrate, a positive electrode material for a spherical lithium-ion secondary battery, comprising the following steps:

[0029] 1) Change the H 3 PO 4 and VCl 3 According to the molar ratio of 4:1, add it into the polytetrafluoroethylene reactor, add water and stir to mix, adjust the pH value to 2.5 with methyltriethylammonium chloride while stirring, then seal the polytetrafluoroethylene reactor, stir 48h;

[0030] 2) Put the reaction kettle into the muffle furnace to heat up at a rate of 5°C / min. When the temperature rises to 200°C, keep it warm for 72 hours;

[0031] 3) Lower the reaction kettle to room temperature at a rate of 5°C / min to obtain a light green precipitate, wash the obtained precipitate with absolute ethanol, and then dry at 90°C to obtain the target product VPO 4 ·H 2 O;

[0032] The SEM image of the obtained product is shown in figure 1 , figure 2 As shown, X-ray analysis such as image 3 As sho...

Embodiment 2

[0034] A preparation method of vanadium phosphate monohydrate, a positive electrode material for a spherical lithium-ion secondary battery, comprising the following steps:

[0035] 1) Change the H 3 PO 4 and VCl 3 According to the molar ratio of 3:1, add it into the polytetrafluoroethylene reactor, add water and stir to mix, adjust the pH value to 3.5 with methyltriethylammonium chloride while stirring, then seal the polytetrafluoroethylene reactor, stir 45h;

[0036] 2) Put the reaction kettle into the muffle furnace to heat up at a rate of 5°C / min. When the temperature rises to 150°C, keep it warm for 75h;

[0037] 3) Lower the reaction kettle to room temperature at a rate of 5°C / min to obtain a light green precipitate, wash the obtained precipitate with absolute ethanol, and then dry at 90°C to obtain the target product VPO 4 ·H 2 O.

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PUM

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Abstract

The invention relates to a preparation method of a spherical lithium-ion secondary battery cathode material vanadium phosphate monohydrate. The spherical lithium-ion secondary battery cathode material VPO4.H2O is prepared by a hydrothermal method. The preparation method has the advantages of being mild in reaction condition, high in product purity, good in crystallinity, uniform in particle size distribution and free of an agglomeration phenomenon; the average particle sizes of the particles are 1.5-3 microns; the prepared cathode material is regular spherical particles, and has relatively high specific surface area in structure; sufficient moistening of electrolyte is facilitated; lithium ion transportation in the cathode material is facilitated in the charging and discharging processes; and the spherical lithium-ion secondary battery cathode material VPO4.H2O synthesized by the method shows good electrochemical properties.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a preparation method of vanadium phosphate monohydrate, a positive electrode material of a spherical lithium ion secondary battery. Background technique [0002] Lithium-ion secondary battery is a new type of green chemical power source. Compared with traditional nickel-cadmium batteries and nickel-hydrogen batteries, it has the advantages of high voltage, long life, high energy density, small size, and low self-discharge rate. Since it first entered the market in 1990, it has been widely used and has been widely used in various portable electronic devices. With the rise of new energy vehicles, lithium-ion batteries are considered to be one of the ideal energy storage devices for new energy vehicles due to their excellent characteristics. [0003] In the composition of lithium-ion secondary batteries, the cathode material is a key factor that determines its electrochemical perfor...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 陈泽华麻鹏程孙广曹建亮王晓冬孟哈日巴拉张传祥张战营
Owner HENAN POLYTECHNIC UNIV
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