A kind of graphene@silicon composite material and preparation method thereof
A technology of silicon composite materials and composite materials, applied in nanotechnology for materials and surface science, active material electrodes, nanotechnology, etc., can solve the problems of high raw material cost, silicon shedding, fast capacity decay, etc., and achieve the preparation process Simple and easy to implement, promote further development, and improve the effect of electrochemical performance
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[0038] Preparation method of graphene @ silicon composite material, including the following steps:
[0039] S1: Nano silicon pretreatment, uniformly dispersed nanoilanes after mixing liquid of ethanol and deionized water, add hydrofluoric acid, so that the surface of nanoila is hydrogen; nano silicon particle size is 5 ~ 150 nm, ethanol is 30 ~ 40 mL, deionized water is 40 ~ 60ml, hydrofluoric acid is 50 ~ 70 mL.
[0040] S2: Chemically deposited metal nickel, adding nanoilanes in step S1 to the chemical plating solution, so that the plating is 5 ~ 15 min under temperature conditions of 30 to 100 ° C, so that it covers a metal nickel; wherein chemistry The plating solution consists of a nickel salt, a complexing agent, sodium hypophosphate, citric acid, surfactant, and the pH of the ferric is adjusted to 8 to 10 by ammonia water. The nickel salt is one or more of nickel chloride, nickel sulfate, nitrate and nickel nickel acetate. The complexing agent is ammonium chloride, ammonium...
Embodiment 1
[0045] S1: After a mixture of nanoilanes a mixed liquid of 35 ml of ethanol and 50 ml of water, 30 ml of hydrofluoric acid treatment is added, so that the surface of nano silicon is hydrogen;
[0046] S2: Formulated contains 0.1 mol / L nickel chloride, 0.56 mol / L ammonium chloride, 0.03 mol / l citric acid, 0.3 mol / L hypophosphite, 0.01 mol / L dodecyl sulfate sodium sulfate, PH 8 was adjusted with ammonia water, and then the pretreated nanoilabia was added to the chemical plating solution, and the plating was soaked at 60 ° C constant temperature.
[0047] S3: The nickel-coated nanoilabia obtained by step S2 is added to 38 mL of triethylene glycol, and the mixture is mixed and uniformly added to the sodium hydroxide solution of 50%, and stirring at 185 ° C for 8 hours. The resulting product was filtered, washed, dried, raised to 450 ° C in a quartz pipe filled with an inert atmosphere, calcined for 1 hour to obtain a graphene / nickel / @ nanomeca composite material;
[0048...
Embodiment 2
[0050] S1: After a mixture of nanoilanes is mixed at 50 ml of ethanol and 50 mL of water, 50 ml of hydrofluoric acid treatment is added, so that the surface of nanoila is hydrogen;
[0051] S2: Formulated containing 0.15 mol / l nickel chloride, 0.56 mol / L ammonium chloride, 0.03 mol / l citric acid, 0.3 mol / L hypophosphite, 0.01 mol / L dodecyl sulfate, PH-8.5 was adjusted with ammonia water, and then the pretreated nanoilabia was added to the chemical plating solution, and the plating was soaked at 50 ° C constant temperature.
[0052] S3: The nickel-coated nanoilabia obtained by step S2 is added to 60 mL of triethylene glycol, and the mixture is mixed and uniform, then 0.25 ml of mass fraction is 50% sodium hydroxide solution, and stirring at 200 ° C for 8 hours, will The resulting product was filtered, washed, dried, raised to 400 ° C in the quartz pipe filled with an inert atmosphere, calcined for 3 hours to obtain graphene / nickel / @ nano-silicon composite material;
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