A kind of silicon-based negative electrode material and its preparation method and application
A silicon-based anode material, nano-silicon technology, applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve problems such as poor cycle stability and high junction resistance, and achieve improved conductivity, buffer volume effect, and improve electron transport. The effect of efficiency
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[0039] In a third aspect, an embodiment of the present invention provides a method for preparing the above-mentioned silicon-based negative electrode material, which can be performed at room temperature. Specifically, the method includes:
[0040] Step 101, dissolving nano-silicon particles in an ethanol solution of graphene having a layered structure, and stirring evenly, so that the nano-silicon particles are embedded in the layered structure of graphene to obtain a first mixed solution.
[0041] Specifically, in step 101, ultrasonic stirring or magnetic stirring is used to uniformly disperse and embed nano-silicon particles on the layered structure of graphene.
[0042] The embodiment of the present invention does not specifically limit the concentration of the graphene ethanol solution, and the concentration is suitable for uniformly dispersing nano-silicon particles therein.
[0043] Step 102, centrifuging the first mixed solution obtained in step 101 to obtain graphene ...
Embodiment 1
[0060] This embodiment provides a silicon-based negative electrode material, which includes the following components in mass percentage: 5% graphene, 2% nano-metal particles, and 93% nano-silicon particles.
[0061] The above-mentioned silicon-based negative electrode material is prepared by the following preparation method:
[0062] Dissolve graphene in ethanol solution according to the mass ratio of each component in the above-mentioned negative electrode material, stir evenly, then add nano-silicon particles, and ultrasonically stir for 1 hour, so that nano-silicon particles are embedded on graphene to obtain a first mixed solution. The first mixed solution was centrifuged to obtain graphene embedded with nano-silicon, and washed three times with water. Add the washed graphene embedded with nano-silicon into the silver nitrate solution, stir for 0.5h, then add hydrofluoric acid with a mass concentration of 10% to the silver nitrate solution to reduce the silver ions into si...
Embodiment 2
[0064] This embodiment provides a silicon-based negative electrode material, which includes the following components in mass percentage: 10% of graphene, 1% of nano-metal particles, and 89% of nano-silicon particles.
[0065] The above-mentioned silicon-based negative electrode material is prepared by the following preparation method:
[0066] Dissolve graphene in ethanol solution according to the mass ratio of each component in the above-mentioned negative electrode material, stir evenly, then add nano-silicon particles, and ultrasonically stir for 1.5 h, so that nano-silicon particles are embedded on the graphene, and the first mixed solution is obtained. The first mixed solution was centrifuged to obtain graphene embedded with nano-silicon, and washed twice with water. Add the washed graphene embedded with nano-silicon into the copper nitrate solution, stir for 0.5h, then add hydrofluoric acid with a mass concentration of 10% to the copper nitrate solution to reduce the cop...
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