A self-assembled flower spherical lithium-ion battery positive electrode material v 2 o 5 preparation method

A technology of lithium ion battery and positive electrode material is applied in the field of preparation of positive electrode material V2O5 of self-assembled flower ball-shaped lithium ion battery, which can solve the problems of high cost of vanadium acetylacetonate, unfavorable large-scale industrialization and the like, achieve uniform morphology and improve electrochemical performance. Performance, easy-to-achieve effects

Active Publication Date: 2017-01-11
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of its raw material vanadium acetylacetonate is relatively high, which is not conducive to large-scale industrialization

Method used

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  • A self-assembled flower spherical lithium-ion battery positive electrode material v <sub>2</sub> o <sub>5</sub> preparation method
  • A self-assembled flower spherical lithium-ion battery positive electrode material v <sub>2</sub> o <sub>5</sub> preparation method
  • A self-assembled flower spherical lithium-ion battery positive electrode material v <sub>2</sub> o <sub>5</sub> preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) The analytical pure ammonium metavanadate (NH 4 VO 3 ) Dissolve in ethylene glycol, then add deionized water to prepare 100mL mixed solution, the volume ratio of ethylene glycol and deionized water is 1:5, magnetic stirring for 1h to make ammonium metavanadate dissolve evenly, prepare NH 4 + The concentration of NH is 0.30mol / L 4 VO 3 Solution, marked as A solution;

[0025] 2) Use 6mol·L -1 Adjust the pH value of the A solution with the diluted hydrochloric acid to 2.0, and then heat the reaction for 2h under the water bath condition of 90℃ to obtain a suspension;

[0026] 3) Centrifugally separate the obtained suspension to obtain a powder product, and then soak the powder product in deionized water for 10 minutes, wash 5 times, and then soak in absolute ethanol for 10 minutes and wash 5 times, and then place it in an oven at 60 Dry at ℃ for 10h to obtain the precursor;

[0027] 4) Put the precursor in a crucible, put it into a muffle furnace and heat it at 350°C for 1 ho...

Embodiment 2

[0030] 1) The analytical pure ammonium metavanadate (NH 4 VO 3 ) Dissolve in ethylene glycol, then add deionized water to prepare 100mL mixed solution, the volume ratio of ethylene glycol and deionized water is 1:4, magnetic stirring for 0.5h to dissolve ammonium metavanadate evenly, and prepare NH 4 + The concentration is 0.25mol / L NH 4 VO 3 Solution, marked as A solution;

[0031] 2) Use 2mol·L -1 Adjust the pH value of the A solution with the diluted hydrochloric acid to 3.0, and then conduct a heating reaction for 5 hours under the condition of a water bath at 60°C to obtain a suspension;

[0032] 3) Centrifugally separate the obtained suspension to obtain a powder product, and then soak the powder product in deionized water for 10 minutes, wash 5 times, and then soak in absolute ethanol for 10 minutes and wash 5 times, and then place it in an oven at 60 Dry at ℃ for 10h to obtain the precursor;

[0033] 4) Put the precursor in a crucible, put it into a muffle furnace and heat it...

Embodiment 3

[0035] 1) The analytical pure ammonium metavanadate (NH 4 VO 3 ) Dissolve in ethylene glycol, then add deionized water to prepare 100mL mixed solution, the volume ratio of ethylene glycol to deionized water is 1:3, magnetic stirring for 0.5h to make ammonium metavanadate dissolve uniformly, and prepare NH 4 + The concentration of NH is 0.20mol / L 4 VO 3 Solution, marked as A solution;

[0036] 2) Use 11mol·L -1 Adjust the pH value of the A solution with the diluted hydrochloric acid to 4, and then heat the reaction for 3h under the condition of a water bath at 70℃ to obtain a suspension;

[0037] 3) Centrifugally separate the obtained suspension to obtain a powder product, and then soak the powder product in deionized water for 10 minutes, wash 5 times, and then soak in absolute ethanol for 10 minutes and wash 5 times, and then place it in an oven at 60 Dry for 10h at ℃, which is the precursor;

[0038] 4) Put the precursor in a crucible, put it into a muffle furnace and heat it at 26...

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Abstract

The invention relates to a preparation method of a self-assembled ball-flower type cathode material for a lithium ion battery. The preparation method comprises the following steps: dissolving ammonium metavanadate in ethylene glycol; then adding deionized water and uniformly stirring to obtain a NH4VO3 solution with the concentration of NH4<+> of 0.10-0.30mol / L; after adjusting the pH value and heating at 60-90 DEG C or carrying out ultrasonic treatment at 1000-1500W to obtain a suspension; and then after centrifugal separation, heating for 1-3 hours. The prepared material V2O5 is microcrystalline and is uniform in chemical composition, relatively high in purity and uniform in shape. Moreover, the prepared V2O5 is a loose structure which is formed by self-assembling nanorods, wherein the diameter of the nanorods is about 50nm and the length of the nanorods is about 1 micron. The cathode material has a relatively large specific surface area, so that not only can the contact area with an electrolyte be effectively increased, but also the diffusing path of lithium ions can be shortened due to the structures of the short nanorods, thereby promoting transmission of the lithium ions and improving the electrochemical performance of the material.

Description

Technical field [0001] The invention relates to a preparation method of a lithium ion battery cathode material, in particular to a self-assembled flower ball-shaped lithium ion battery cathode material V 2 O 5 The preparation method. Background technique [0002] Lithium-ion batteries have the advantages of high discharge platform, high energy density, long cycle life, good safety, and environmental protection, and have been widely used in various portable electronic devices. However, this system still has some problems, such as poor safety performance and high cost. In addition, the energy density of the battery mainly depends on the battery cathode material, and the actual specific capacity of the mainstream cathode materials is about 170mAh / g. V 2 O 5 As a lithium intercalation material with a layered structure, it belongs to the orthorhombic system, Pmmn(59) space group. In V 2 O 5 In the crystal structure, [VO 5 ] The quadrangular pyramids are connected to form a two-dimen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391C01G31/02B82Y40/00
CPCB82Y40/00H01M4/1391H01M4/483H01M2004/028Y02E60/10
Inventor 黄剑锋乔晓宁曹丽云许占位欧阳海波李嘉胤卢靖郑蕾
Owner SHAANXI UNIV OF SCI & TECH
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