A kind of preparation method of electrode cathode material containing graphene
A cathode material, graphene technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of insufficient performance, difficult to practical, uneven electrode material structure, etc., to promote graphene dispersion, full process, easy to achieve Effect
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Embodiment 1
[0015] A method for preparing a graphene-containing electrode anode material is characterized by comprising the following steps.
[0016] 1) Preparation steps of graphene microflakes: using a large amount of prefabricated expanded graphite flakes as raw materials, the graphene microflake dispersion is generated through ultrasonic peeling in dehydrated alcohol for more than 1-2h; after low-frequency ultrasound, the upper dispersion is taken out, Leave the unstripped graphite in the container; replenish the solvent of the upper dispersion liquid with absolute ethanol to more than 200-300ml, oscillate with high-intensity ultrasonic waves for 3-5 minutes, let stand for 5-10s, immediately discard half of the dispersion liquid in the upper layer, and then add Absolute ethanol to a volume of more than 200-300ml, repeat the above process at least 10-20 times, until the average radial size of the graphene microflakes is confirmed by AFM or SEM to be higher than 5-10um; spin evaporate al...
Embodiment 2
[0020]With the method in embodiment 1, difference is: in described step (1), in dehydrated alcohol, generate graphene microchip dispersion liquid through ultrasonic stripping more than 1.5h; 220ml or more, high-intensity ultrasonic vibration for 4 minutes, let stand for 8s, and then add absolute ethanol to a volume of more than 220ml, repeat the above process at least 15 times, until the average radial size of the graphene microflakes is confirmed by AFM or SEM to be higher than 5um. In the step (2), insert a stirring rod from the first port of the four-neck bottle to stir at 4 rpm, and keep stirring at 35-40°C; take 0.2-0.3 parts by weight of The PVA ultrafine powder with a particle size below 60um is slowly added from the second port of the four-neck bottle; take 5-7 parts by weight of ascorbic acid, dissolve it with double distilled water at 35-40°C, and keep it at 35-40°C Stir the ascorbic acid solution under magnetic force at ℃, and add it from the third port of the four-...
Embodiment 3
[0022] With the method of embodiment 1, difference is: in described step (1), in dehydrated alcohol, generate graphene microsheet dispersion liquid through ultrasonic stripping more than 2h; The solvent dehydrated alcohol of upper strata dispersion liquid is replenished to more than 270ml, High-intensity ultrasonic vibration for 5 minutes, stand still for 10 seconds, and then add absolute ethanol to a volume of more than 270ml, repeat the above process at least 20 times, until the average radial size of the graphene microflakes is confirmed to be higher than 6um by AFM or SEM; the steps (2), insert a stirring bar from the first port of the four-neck bottle to stir at 5 rpm, and keep stirring at 34-45°C; take 0.3-0.4 parts by weight of Slowly add the PVA ultrafine powder below 60um from the second port of the four-necked bottle; take 7-9 parts by weight of ascorbic acid, dissolve it with double distilled water at 40-45°C, and keep it at 40-45°C under magnetic force Stir the asc...
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