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
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[0031] Example 1
[0032] A method for preparing high-performance Prussian blue@graphite lithium battery composite cathode material includes the following steps:
[0033] (1) In terms of parts by mass, add 7 parts of natural graphite to 100 parts of deionized water, and ultrasonically disperse 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), and stir vigorously at 65°C for 6 hours at a stirring rate of 1000 r / min , Centrifuge the resulting suspension, wash it with deionized water and absolute ethanol 3 times each, and dry it 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 at a mass ratio of 90:10 to obtain a mixture, add the solvent N-methylpyrrolidone w...
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[0041] Example 2
[0042] A method for preparing high-performance Prussian blue@graphite lithium battery composite cathode material includes the following steps:
[0043] (1) In terms of parts by mass, add 6 parts of natural graphite to 100 parts of deionized water, and ultrasonically disperse for 1.5 hours to form a uniform natural graphite dispersion;
[0044] (2) In terms of parts by mass, dissolve 8.5 parts of potassium ferrocyanide and 4.6 parts of ferric chloride in the dispersion obtained in step (1), stir vigorously at 65°C for 6 hours, and stir at a rate of 1000 r / min. The obtained suspension was centrifuged, washed with deionized water and absolute ethanol for 3 times, and dried in a vacuum oven at 90°C for 12 hours to obtain a composite material of Prussian blue and graphite;
[0045] (3) Mix the composite material obtained in step (2) with the binder polytetrafluoroethylene at a mass ratio of 85:10 to obtain a mixture, and add the solvent N,N-dimethyl with a mass ratio of ...
Example Embodiment
[0047] Example 3
[0048] A method for preparing high-performance Prussian blue@graphite lithium battery composite cathode material includes the following steps:
[0049] (1) In terms of parts by mass, add 8 parts of natural graphite to 100 parts of deionized water, and ultrasonically disperse for 2 hours to form a uniform natural graphite dispersion;
[0050] (2) In terms of parts by mass, dissolve 8.5 parts of potassium ferrocyanide and 4.9 parts of ferric chloride in the dispersion obtained in step (1), and stir vigorously at 65°C for 6 hours at a stirring rate of 800 r / min. The resulting suspension was centrifuged, washed with deionized water and absolute ethanol for 3 times, 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 at a mass ratio of 85:10 to obtain a mixture, and add solvent deionized water with a mass ra...
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