A kind of graphene/silicon composite microsphere and preparation method thereof
A graphene composite and composite microsphere technology, applied in graphene, chemical instruments and methods, silicon, etc., can solve problems such as high cost, unsuitable for civilian production, and huge breakthroughs in pure graphene-based batteries to achieve guaranteed capacity , Guaranteed charging and discharging speed, cost-saving effect
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Embodiment 1
[0046] The present embodiment prepares graphene / silicon composite microsphere, comprises the following steps:
[0047] (1) Use single-layer graphene oxide with a size of 60-100um, prepare a graphene oxide solution with a concentration of 0.1mg / mL, and spray dry it at 200°C to obtain graphene oxide wrinkled microspheres with a size of about 2-5um, such as figure 1 shown.
[0048] (2) The graphene oxide wrinkled microspheres were fumigated with hydrazine hydrate steam for 1 h at a temperature of 120 °C, and then transferred to an aqueous solution of hydrazine hydrate with a volume fraction of 10% for a reduction time of 12 h to obtain reduced graphene microspheres.
[0049] (3) The reduced graphene microspheres obtained in step (2) were subjected to heat treatment as follows: the temperature was rapidly raised to 300°C at a rate of 10°C / min, and then slowly raised to 1600°C at a rate of 10°C / min.
[0050] (4) Disperse the heat-treated graphene microspheres in a mixed solution c...
Embodiment 2
[0061] The present embodiment prepares graphene / silicon composite microsphere, comprises the following steps:
[0062] (1) Using single-layer graphene oxide with a size in the range of 60-100um, prepare a graphene oxide solution with a concentration of 0.01mg / mL, and spray dry at 280°C to obtain graphene oxide wrinkled microspheres with a size of 1-2um.
[0063] (2) The graphene oxide wrinkled microspheres were fumigated with hydrazine hydrate steam for 12 hours at a temperature of 10°C, and then transferred to an aqueous solution of hydrazine hydrate with a volume fraction of 60% for a reduction time of 1 hour to obtain reduced graphene microspheres.
[0064] (3) Perform the following heat treatment on the reduced graphene microspheres obtained in step (2): rapidly raise the temperature to 400°C at a rate of 50°C / min, and then slowly increase the temperature to 1800°C at a rate of 5°C / min;
[0065] (4) Disperse the heat-treated graphene microspheres in a mixed solution compos...
Embodiment 3
[0073] The present embodiment prepares porous graphene / silicon composite microspheres, comprising the following steps:
[0074] (1) Using single-layer graphene oxide with a size ranging from 40-200um, a graphene oxide solution with a concentration of 1mg / mL was prepared, and spray-dried at 240°C to obtain graphene oxide wrinkled microspheres with a size of 8-10um.
[0075] (2) The graphene oxide wrinkled microspheres were fumigated with hydrazine hydrate steam for 6 hours at a temperature of 60°C, and then transferred to an aqueous solution of hydrazine hydrate with a volume fraction of 40% for a reduction time of 6 hours to obtain reduced graphene microspheres.
[0076] (3) Perform the following heat treatment on the reduced graphene microspheres obtained in step (2): rapidly heat up to 400°C at a rate of 40°C / min, and then slowly heat up to 1800°C at a rate of 5°C / min;
[0077] (4) Disperse the heat-treated graphene microspheres in a mixed solution composed of 50% hydrogen p...
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