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High-performance Prussian blue @ graphite lithium battery composite cathode material and preparation method thereof

A composite positive electrode material, Prussian blue technology, applied in the direction of battery electrodes, graphite, secondary batteries, etc., can solve the problems of high cost, poor cycle stability, low Coulombic efficiency, etc., and achieve good conductivity, good conductivity, high power The effect of chemical activity

Inactive Publication Date: 2019-01-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the purpose of the present invention is to overcome the problems of high cost, low Coulombic efficiency, and poor cycle stability of traditional lithium-ion battery cathode materials, and provide a high-performance Prussian blue@graphite lithium battery composite cathode material and its preparation method

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  • High-performance Prussian blue @ graphite lithium battery composite cathode material and preparation method thereof
  • High-performance Prussian blue @ graphite lithium battery composite cathode material and preparation method thereof
  • High-performance Prussian blue @ graphite lithium battery composite cathode material and preparation method thereof

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Embodiment 1

[0032] A method for preparing a high-performance Prussian blue@graphite lithium battery composite positive electrode material, comprising the following steps:

[0033] (1) In terms of parts by mass, 7 parts of natural graphite are added to 100 parts of deionized water, and ultrasonically dispersed for 1 hour to form a uniform natural graphite dispersion;

[0034] (2) In terms of parts by mass, dissolve 8.5 parts of potassium ferrocyanide and 4.3 parts of ferric chloride in the natural graphite dispersion obtained in step (1), stir vigorously at 65°C for 6h, and the stirring rate is 1000r / min , the resulting suspension was centrifuged, washed three times with deionized water and absolute ethanol, and dried in a vacuum oven at 90°C for 12 hours to obtain a composite material of Prussian blue and graphite;

[0035] (3) Mix the composite material obtained in step (2) with the binder polyvinylidene fluoride in a mass ratio of 90:10 to obtain a mixture, add solvent N-methylpyrrolido...

Embodiment 2

[0042] A method for preparing a high-performance Prussian blue@graphite lithium battery composite positive electrode material, comprising the following steps:

[0043] (1) In terms of parts by mass, 6 parts of natural graphite are added to 100 parts of deionized water, and ultrasonically dispersed for 1.5 h to form a uniform natural graphite dispersion;

[0044] (2) In terms of parts by mass, 8.5 parts of potassium ferrocyanide and 4.6 parts of ferric chloride were dissolved in the dispersion obtained in step (1), and vigorously stirred at 65°C for 6 hours at a stirring rate of 1000r / min. The resulting suspension was centrifuged, washed three times with deionized water and absolute ethanol, and dried in a vacuum oven at 90°C for 12 hours to obtain a composite material of Prussian blue and graphite;

[0045] (3) The composite material obtained in step (2) is mixed with the binder polytetrafluoroethylene in a mass ratio of 85:10 to obtain a mixture, and the solvent N, N-dimethyl...

Embodiment 3

[0048] A method for preparing a high-performance Prussian blue@graphite lithium battery composite positive electrode material, comprising the following steps:

[0049] (1) In terms of parts by mass, 8 parts of natural graphite are added to 100 parts of deionized water, and ultrasonically dispersed for 2 hours to form a uniform natural graphite dispersion;

[0050] (2) In terms of parts by mass, 8.5 parts of potassium ferrocyanide and 4.9 parts of ferric chloride were dissolved in the dispersion obtained in step (1), and vigorously stirred at 65°C for 6 hours at a stirring rate of 800r / min. The resulting suspension was centrifuged, washed three times with deionized water and absolute ethanol, and dried in a vacuum oven at 90°C for 12 hours to obtain a composite material of Prussian blue and graphite;

[0051] (3) Mix the composite material obtained in step (2) with the binder sodium carboxymethyl cellulose in a mass ratio of 85:10 to obtain a mixture, add solvent deionized wate...

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Abstract

The invention discloses a high-performance Prussian blue @ graphite lithium battery composite cathode material and a preparation method thereof. The preparation method comprises uniformly dispersing natural graphite powder in deionized water, dissolving ferrocyanide salt and ferric chloride in the dispersion, vigorously stirring the mixture at 60-65 DEG C for 4-6h, centrifuging, washing and vacuumdrying to obtain a composite material of Prussian blue and graphite; Mixing the obtained composite material with a binder, adding a solvent and stirring to form a coating slurry; The slurry was evenly coated on aluminum foil by coating method, dried, sliced and used as cathode material of lithium battery. The preparation method has the advantages of simple process, cheap raw materials, environmental protection, high structural stability and excellent electrochemical performance of the Prussian blue @ graphite composite material, and has good application prospect.

Description

technical field [0001] The invention relates to the technical field of preparation of composite electrode materials, in particular to a high-performance Prussian blue@graphite lithium battery composite positive electrode material and its preparation method and application. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles and portable electronic devices due to their high energy density, long cycle life, and low self-discharge rate. Among them, as a positive electrode material that provides a large amount of free "intercalation / extraction" of lithium ions, its capacity is lower than that of the negative electrode material, which largely determines the performance and cost of lithium-ion batteries. [0003] Prussian blue is a coordination polymer, due to the asymmetric CN ‐ , so that such compounds have a perfect three-dimensional polymeric structure. Its huge open framework structure can not only accommodate transition metal ions and s...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/60H01M4/583H01M4/62H01M10/0525C01B32/20
CPCC01B32/20H01M4/366H01M4/583H01M4/60H01M4/625H01M10/0525Y02E60/10
Inventor 袁文辉王爱业肖强强李莉罗苑子
Owner SOUTH CHINA UNIV OF TECH
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