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A kind of preparation method of spherical lithium ion battery negative electrode material vanadium borate

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as low theoretical capacity and poor safety performance, and achieve improved tap density, favorable processing, and excellent electrochemical performance Effect

Active Publication Date: 2017-01-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, due to its low theoretical capacity (about 372mAh / g) and poor safety performance, commercial graphite anode materials are difficult to meet the requirements of power batteries. Therefore, it is particularly necessary to explore other alternative materials.

Method used

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  • A kind of preparation method of spherical lithium ion battery negative electrode material vanadium borate
  • A kind of preparation method of spherical lithium ion battery negative electrode material vanadium borate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This embodiment includes the following steps:

[0022] (1) Weigh 0.0125mol of vanadium pentoxide, 0.025mol of boric acid, and 0.05mol of oxalic acid, mix them, and dissolve them in 250mL of deionized water to obtain a mixed solution;

[0023] (2) Place the mixed solution obtained in step (1) in a constant temperature water bath at 60°C and stir for 8 hours to form a solution;

[0024] (3) adjusting the pH value of the solution obtained in step (2) to 7;

[0025] (4) The solution processed in step (3) is dried and granulated by spray drying. The temperature of the spray drying air inlet is 260°C, the rotating speed of the peristaltic pump is 1000 rev / min, and the fan power is 60Hz to obtain vanadium borate (VBO 3 )Precursor;

[0026] (5) the vanadium borate (VBO) obtained in step (4) 3 ) precursor was placed in a tubular sintering furnace, sintered at 700 °C for 8 h in an argon atmosphere, and then cooled naturally to room temperature to obtain a spherical lithium-ion...

Embodiment 2

[0030] This embodiment includes the following steps:

[0031] (1) Weigh 0.01mol of ammonium metavanadate, 0.005mol of diboron trioxide, and 0.04mol of citric acid, mix them, and dissolve them in 200mL of deionized water to obtain a mixed solution;

[0032] (2) Place the mixed solution obtained in step (1) in a constant temperature water bath at 90°C and stir for 4 hours to form a homogeneous solution;

[0033] (3) adjusting the pH value of the solution obtained in step (2) to 6;

[0034] (4) The solution processed in step (3) is dried and granulated by spray drying. The temperature of the spray drying air inlet is 180° C., the rotating speed of the peristaltic pump is 1800 rpm, and the fan power is 80 Hz to obtain vanadium borate (VBO 3 )Precursor;

[0035] (5) the vanadium borate (VBO) obtained in step (4) 3 ) precursor was placed in a tubular sintering furnace, sintered at 800 °C for 8 h in an argon atmosphere, and then cooled naturally to room temperature to obtain a sph...

Embodiment 3

[0038] This embodiment includes the following steps:

[0039] (1) Weigh 0.04mol of vanadium pentoxide, 0.08mol of ammonium borate, and 0.18mol of oxalic acid, mix them, and dissolve them in 100mL of deionized water to obtain a mixed solution;

[0040] (2) Place the mixed solution obtained in step (1) in a constant temperature water bath at 80°C and stir for 6 hours to form a homogeneous solution;

[0041] (3) adjusting the pH value of the solution obtained in step (2) to 9;

[0042] (4) carry out dry granulation by the solution that step (3) handles by the method for spray drying, the air inlet temperature of spray drying is 200 ℃, and the peristaltic pump rotating speed is 1500 rev / min, and fan power is 100Hz, obtains vanadium borate ( VBO 3 )Precursor;

[0043] (5) the vanadium borate (VBO) obtained in step (4) 3 ) precursor was placed in a tube-type sintering furnace, sintered at 500 °C for 20 h under a nitrogen atmosphere, and then naturally cooled to room temperature to...

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Abstract

A preparation method of a spherical lithium ion battery anode material vanadium borate includes following steps: (1) dissolving a vanadium source, a boron source and a reduction agent in deionized water to obtain a mixed solution according to the molar ratio of vanadium element, boron element to the reduction agent of 1:1:2-4; (2) placing the mixed solution in a 60-90 DEG C constant-temperature water-bath pot with stirring for 4-8 h to obtain a solution; (3) regulating the pH of the solution to 6-9; (4) performing granulation to obtain a vanadium borate precursor in a spray-drying manner; (5) placing the vanadium borate precursor in a tubular sintering furnace and sintering the vanadium borate precursor at 500-800 DEG C for 8-20 h under a non-reducing atmosphere. The spherical lithium ion battery anode material vanadium borate is high in specific capacity, is excellent in rate capability and is excellent in cycle performance due to the unique crystal structure and micro appearance 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 spherical lithium ion battery negative electrode material vanadium borate. Background technique [0002] Lithium-ion power batteries have an absolute advantage in the development of the global electric vehicle industry, and its dominant position will not be shaken in the next few decades. With the continuous development of society, it is particularly necessary to develop power batteries with high energy density. Low cost, long life and high safety, as the core elements of power batteries, are closely related to electrode materials. As a key factor determining the overall performance of lithium-ion batteries, the research on negative electrode materials has always been a hot spot in this field. At present, due to its low theoretical capacity (about 372mAh / g) and poor safety performance, commercial graphite anod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1397
CPCY02E60/10
Inventor 张宝朱玉时郑俊超韩亚东孙楠周其杰童汇田业成
Owner CENT SOUTH UNIV
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