Silicon-based negative electrode composite material and preparation method thereof
A silicon-based negative electrode and composite material technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of increasing process steps and process costs, and achieve the effect of improving cycle stability, stable structure, and simple process
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[0043] A method for preparing a silicon-based negative electrode composite material provided in an embodiment of the present invention includes the following steps:
[0044] Step 1: taking the silicon-based material 1 and the metal oxide, and uniformly mixing the silicon-based material 1 and the metal oxide through a high-energy ball milling process to obtain a mixture;
[0045] Step 2: calcining the mixture under the condition of an inert atmosphere, so that the surface of the silicon-based material 1 is coated with an initial metal oxide layer;
[0046] Step 3: Depositing a graphene layer 3 on the surface of the initial metal oxide layer by chemical vapor deposition, so that the surface of the silicon-based material 1 is sequentially coated with the initial metal oxide layer and the graphene layer 3, and the graphite The surface of the vinyl layer 3 has a first hole 31 to obtain an initial silicon-based negative electrode composite material;
[0047] Step 4: Put the initial...
Embodiment 1
[0060] A method for preparing a silicon-based negative electrode composite material, comprising the following steps:
[0061] Step 1: Take ferrosilicon alloy and iron oxide, wherein the mass ratio of ferrosilicon alloy and iron oxide is 1:0.2. After mixing the ferrosilicon alloy with iron oxide, it is placed in a high-energy ball mill. The rotational speed was 1000 rpm, and the ball milling time was 3 hours to obtain a mixture.
[0062] Step 2: The mixture was calcined in an inert environment of argon, wherein the temperature was raised from room temperature to 400° C. at a rate of 1° C. / min, and the calcination time was 6 h. Cool to room temperature after calcination, so that the surface of the ferrosilicon alloy is coated with an initial iron oxide layer.
[0063] Step 3: Put the ferrosilicon alloy coated with the initial iron oxide layer on the surface for sintering in an atmosphere furnace, feed methanol, water vapor and inert gases nitrogen and argon, and the volume fra...
Embodiment 2
[0066] A method for preparing a silicon-based negative electrode composite material, comprising the following steps:
[0067] Step 1: Take silicon and nickel oxide, wherein the mass ratio of silicon and nickel oxide is 1-3. After silicon and nickel oxide are mixed, they are placed in a high energy ball mill. The rotational speed was 1500 rpm, and the ball milling time was 1 h to obtain a mixture.
[0068] Step 2: The mixture was calcined in an inert environment of nitrogen, wherein the temperature was raised from room temperature to 700° C. at a rate of 5° C. / min, and the calcination time was 2 h. Cool to room temperature after calcination, so that the silicon surface is coated with a nickel oxide layer.
[0069] Step 3: The silicon coated with the initial nickel oxide layer on the surface is sintered in an atmosphere furnace, and methanol, water vapor, and inert gas nitrogen and argon are introduced, and the volume fractions of methanol and water vapor introduced are 90% an...
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Abstract
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